Answers
NK cells are derived from the same stem cells as b and t cells, these cells differentiate self from nonself through (b) MHCs.
The Major Histocompatibility Complex (MHC) is an essential component in the immune system's ability to distinguish among self and non-self antigens. MHC limits how an antigen is presented to the outside.
The remaining choices are incorrect due to the fact that they do not play a role in the mentioned discrimination but rather play different roles. The membrane attack complex, often known as MACs, is created in the complement pathway. Its purpose is to eliminate antigens; it does not distinguish across self and nonself antigens. Similar to this, TLRs (toll-like receptors) play a receptor role in the innate immune system and do not distinguish among self and nonself.
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Related Questions
A woman who is a carrier for #1 hemophilia and a man that does not have the
condition have children. What is the probability that they will have a child
with the condition being studied? What is the gender of that child?
#2 In plants, inflated pea pods are dominant to constricted pea pods. Two pea pods both heterozygous for pod shape are crossed. What is the probability that they could produce constricted pea pods ?
#3 A woman that is heterozygous for Huntington's disease and a man that does not have the condition have children . What is the probability that their children inherit the Huntington's gene ?
#4 A woman that is heterozygous for type A blood and a man that is heterozygous for type B blood have children. What are the possible blood types of their children?
#5 Two people are both unknowingly carriers for the cystic fibrosis gene. What is the probability that they will have children with cystic fibrosis?
Answers
Answer:
Explanation:
A woman who is a carrier for #1 hemophilia and a man that does not have the condition have children. What is the probability that they will have a child with the condition being studied? What is the gender of that child?
if the baby gets the Y chromosome from the father it will be a boy. If the boy gets his mother's X chromosome with the hemophilia gene he will have hemophilia. If he inherits his mother's other X chromosome, he will have normal blood clotting. If the baby gets the X chromosome from the father it will be a girl.
#4 A woman that is heterozygous for type A blood and a man that is heterozygous for type B blood have children. What are the possible blood types of their children?
One parent with A and another with B can produce a child with A, B, AB or O blood types.
#5 Two people are both unknowingly carriers for the cystic fibrosis gene. What is the probability that they will have children with cystic fibrosis?
If both parents are carriers there is a 1 in 4 (25 percent) chance that both will pass on the non-functioning gene, which would result in a pregnancy affected with cystic fibrosis.
#3 A woman that is heterozygous for Huntington's disease and a man that does not have the condition have children . What is the probability that their children inherit the Huntington's gene ?
Huntington's disease (HD) is what is called a dominant genetic disease. What this usually means is that a child only has a chance of getting a disease like this if a parent has it too. But parents without HD can have a child with HD. This is true of any dominant genetic disease
When a rock transforms into another type of rock, what is the scale at which these changes are occurring?
A. The changes are physical only; the rocks are the same rocks, they just look different
B. At the subatomic level; the rocks atoms are gaining and losing subatomic particles and changing.
C. At the molecular level; the rocks are forming new bonds and becoming something new
D. At the atomic level; the rocks are becoming new rocks and changing on an atomic level.
Answers
When a rock transforms into another type of rock, the scale at which these changes are occurring is at the atomic level, which is option D.
Rocks are composed of minerals, which are made up of different combinations of atoms. During the process of rock transformation, such as through the geological processes of metamorphism or igneous activity, the arrangement and composition of the atoms within the minerals change. This leads to the formation of new minerals and the alteration of the rock's properties.
At the atomic level, the atoms within the minerals may rearrange themselves, forming new bonds and crystal structures.
This can result in changes in the physical characteristics of the rock, such as its texture, color, or mineral composition.
The transformation may involve the loss or gain of atoms, leading to changes in the overall chemical composition of the rock.
Therefore, the changes occurring when a rock transforms into another type of rock primarily occur at the atomic level, as the atoms within the minerals undergo reorganization and bonding to create a new rock with distinct properties.
Therefore, the correct answer is D.
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fossils at used to determine what
Answers
Answer:
fossils are used to tell how long they lived what did they eat how they died habitat what they eat
Explanation:
The fossils present in a rock exposure or in a core hole can be used to determine the ages of rocks very precisely. Detailed studies of many rocks from many places reveal that some fossils have a short, well-known time of existence. These useful fossils are called index fossils.
Answer:
Fossils have been used by scientists to determine the dates of rock layers (or strata) that were laid down in succession hundreds of years ago. However, the accuracy and precision of this method depend on several conditions, such as depth, lithology, thickness and abundance of the fossils in that rock.
Explanation:
5. Marie sold eggs at the market every day from Monday to Friday. On Wednesday she sold 65 eggs and on Thursday she sold 90 eggs. Friday evening, she noticed something interesting. The number of eggs she sold each day was equal to the sum of the number of eggs she sold the previous two days. How many eggs did Marie sell on Monday?
Answers
Answer:
Marie sold 55 eggs on Monday.
Explanation:
Match the following terms with the correct definition.
1. Hypothesis
2. Control
3. Dependent Variable
4. Experiment
5. Conclusion
6. Data
7. Independent Variable
A. Organized process to test a hypothesis
B. An educated guess about the solution to a problem
C. Observations & measurements recorded
D. A judgment based on the results of an experiment.
E. Used to show that the result of an experiment is
really due to the condition being tested
F. The factor that is manipulated during an experiment
G. The response that is measured in an experiment
Answers
The match for the given scenario will be 1-B, 2-E, 3-F, 4-A, 5-D, 6-C, and 7-G.
What is an experiment?An experiment is a methodology that is conducted out to confirm or disprove a hypothesis, or to assess the effectiveness or possibility of a method that has never been tried before.
A hypothesis is an educated guess about a problem's solution. Control is used to demonstrate that the outcome of an experiment is truly due to the condition under test.
The component that is manipulated during an experiment is known as the dependent variable. Experiment is a structured process for testing a hypothesis.
A conclusion is a decision based on the outcomes of an experiment. Observations and dimensions are recorded as data.
The response measured in an experiment is known as the independent variable.
Thus, the correct match is 1-B, 2-E, 3-F, 4-A, 5-D, 6-C, and 7-G.
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Take a look at tgis art piece of art
The cultures that created this form of art thought it important to pass the artwork on to future generations
What type of oceanic art is this considered to be?
A. Australian Art
B. Micronesian Art
C. Melanesian Art
D. Polynesian Art
Edmentum/Plato
Answers
The given art piece is considered to be Polynesian Art. So the correct option is option D.
Polynesia is divided into the East Polynesian and West Polynesian cultural groups. West Polynesian culture is characterized by a high population density. West Polynesia has strong marriage institutions and well-established judicial, monetary, and commercial customs. West Polynesia includes the groups, Tonga, Samoa, and Fiji.
People were artists and craftspeople of exceptional skill. Simple things like fish hooks would be made to exact specifications for various catches and embellished even when the embellishment wasn’t part of the purpose. Stone and wood weapons were seen as more powerful the more beautifully crafted and embellished they were. In many island groups, weaving was an integral part of their culture, and gift-giving of woven articles was a long-standing tradition.
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chargaff found that the proportion of adenine, guanine, cytosine, and thymine varied from organism to organism. How dos chargaffs work support the idea that Dna is the molecule of inheritance
Answers
Chargaff's work supports the idea that DNA is the molecule of inheritance because it showed that the proportions of the four nucleotides in DNA vary from organism to organism. This suggests that the sequence of nucleotides in DNA is responsible for the differences between organisms, and that this sequence is passed down from generation to generation. This is consistent with the idea that DNA is the molecule of inheritance.
Chargaff rule help in understanding that adenine, cytosine, guanine, and thymine are the main bases. These bases are used by the organisms which constitute the genetic material. They are arranged in different manners which causes variations.
What is the chargaff base pairing rule?According to Chargaff's rule, an organism contains the same amount of adenine (A) as thymine (T) and the same amount of guanine as cytosine (C).
Chargaff rules a) The pyrimidines (cytosine and thymine) are equal to the sum of the purines (adenine and guanine); b) the molar proportion of adenine to thymine approaches 1; ( c) the guanine-to-mole ratio. This formula is only applicable to DNA.
Therefore, the Chargaff rule help in understanding nucleotide base pairing.
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Identify the choice that best completes the statement or answers the question.
A scientist analyzes a fossil found in the limestone layer of Mountain A. By applying the technique of radiometric dating to the fossil, the scientist concludes that the limestone formed approximately 1.34 billion years ago.
Which two assumptions are necessary to support the scientist's conclusion? Select the two correct answers.
options:
After the fossil formed, all of its radioactive isotopes decayed very quickly.
Radioactive isotopes decay at a constant rate over long spans of time.
The fossil formed at the same time as the limestone surrounding it.
The fossil formed from the same materials as the limestone surrounding it.
After the limestone formed, chemical and physical processes affected it only minimally.
Answers
The correct answers are: Over extended periods of time, radioactive isotopes degrade at a consistent rate.
The limestone around the fossil also formed at the same time.
Radiometric datingThe age of a material can be ascertained via radiometric dating by observing the decay of its radioactive isotopes. In the case of the limestone layer discovered in Mountain A, a scientist used radiometric dating to examine a fossil discovered within the layer and came to the conclusion that the limestone originated about 1.34 billion years ago. Two premises are required for the validity of this conclusion. Secondly, a key tenet of radiometric dating is that radioactive isotopes decay over extended periods of time at a constant rate. Second, it is assumed that there were no significant alterations or disturbances to the stratum following its formation because the fossil formed concurrently with the limestone that surrounded it.learn more about fossils here
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are there traits that were absent from the population in earlier generations that reappeared?
Answers
It’s possible. It depends on the species. They can migrate to somewhere they have been before and gain old traits back.
8. Write yes or no to indicate whether the options apply to index fossils or not:
the organisms lived during a particular, short time period
a)
b)
the organisms lived over a long span of time
)
c)
found in sedimentary rock
d)
found in igneous rocks
SO
e)
three criteria
f)
easily recognized
g)
not very many of the organisms existed
found on only one or two continents
h)
Answers
Answer:
I think its Yes ye
s bo no ye
s no
2.
In the figure below, B, C and D together are called?
Label the parts of the cell cycle diagram and briefly ...
mitosis
prophase
interphase
synthesis
Answers
In the figure, B, C and D together are called interphase.
What is interphase?The interphase is a part of the cell cycle in which DNA replication occurs in the cell in order to enter mitosis, it is like the moment of preparation before cell division. It is commonly called also resting phase.
It will not be part of mitosis but it is before it starts. It will be composed of the G1 phase in which there is protein synthesis so that the cell will increase in volume, the S phase in which DNA synthesis is generated and the G2 phase in which the cell prepares for cell growth. division.
Therefore, we can confirm that in the figure, B, C and D together are called interphase.
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I think that I did these wrong. Is there anyone that can clarify if they are right?
Answers
For four it should be there are no carriers because they were affected(female)
Compared to fish found in lower temperature habitats, fish that inhabit higher temperatures tend to have more ____
Answers
Compared to fish found in lower-temperature habitats, fish that inhabit higher temperatures tend to have more saturated fatty acids (phospholipids) to maintain synaptic membrane fluidity.
Their metabolic rate, and consequently their energy balance and activity, such as their locomotor and eating habits, are impacted by the temperature.
The ability and desire of fish to obtain food, as well as the manner in which they digest food, absorb nutrients through their gastrointestinal system, and store surplus energy, are all affected by temperature. Temperature also plays a role in how to fish process food through digestion.
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Compare What is the main difference between astronomy and other branches of Earth science?
Answers
Answer:
Astronomy is a study based off of the stars and whats outside our planet while earth science is based on whats in and on our planet .
Explanation:
I hope this helps! Have a great day.
A student placed a prepared slide on the stage of a light microscope. Describe how to adjust the microscope to view the slide at a magnification of x400.
Answers
Here are the steps for viewing a slide at 400X magnification: In a compound and light microscope, prepare a slide and keep it near the objective lens at all times. Put a 10X magnification ocular lens in the area of the microscope.
How does 400x magnification work?You can see a very detailed image of the specimen on your slide thanks to the 400x total magnification that a high-power optical system and a 10x eyepiece provide.
Which focus knob at 40x 400x is simpler to use?The coarse focus knob or fine focus knob, respectively, will be the ones that are simpler to use at 40X and 400X. At low magnifications, like 40X, the coarser focus knob is simpler to operate because it makes it easy to focus the specimen more quickly.
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Lab Intro - The Metric System
Exercise A - Measurement or distance
Someone help please
Answers
The metric system is a system of measurement that is utilized throughout the world. The fundamental units of the metric system are meter, gram, and liter. In this system, prefixes are used to represent measurements that are bigger or smaller than the fundamental units.
The prefix “kilo-,” for example, indicates a measurement that is a thousand times bigger than the fundamental unit. Lab Intro - The Metric System Exercise A - Measurement or Distance The metric system is used to measure length or distance.
The standard unit of length in the metric system is the meter, which is represented by the symbol “m.” The metric system is used to measure distances or lengths that vary from millimeters (mm) to kilometers (km).In order to determine measurements in the metric system, the fundamental units are combined with prefixes.
For example, one centimeter (cm) is equal to 1/100th of a meter, while one millimeter (mm) is equal to 1/1000th of a meter. One kilometer (km), on the other hand, is equal to a thousand meters (m).
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Question 8 (1 point)
Sami is a hospitality designer creating a new look for a fine Italian restaurant's dining
room. He is using mostly synthetic fabrics for the remodel. Why is Sami MOST
LIKELY selecting synthetic fabrics for this project?
They are better for hot weather.
They require less washing.
They stain easily.
They are durable.
Answers
Answer:
Sami is MOST LIKELY selecting synthetic fabrics for this project because they are durable. Synthetic fabrics are made of man-made fibers such as polyester, nylon, and rayon, which are known for their strength, durability, and resistance to wear and tear. This makes them an ideal choice for high-traffic areas such as a restaurant dining room, where the fabrics may be exposed to spills and stains, frequent use, and regular cleaning.
63. State and briefly describe four Koch's postulates?
Answers
Answer:
Koch's postulates are a set of criteria that are used to establish a causal relationship between a microbe and a specific disease. The four postulates are:
The microbe must be present in every case of the disease.The microbe must be isolated from the host with the disease and grown in pure culture.The specific disease must be reproduced when the microbe is introduced into a healthy host.The microbe must be re-isolated from the host with the disease and shown to be the same as the original microbe.These postulates were first proposed by the German physician and scientist Robert Koch in the late 19th century, and they remain an important tool in the field of medical microbiology.
Select the correct location on the image.
Which part of the image shows a reproductive structure that forms offspring that are genetically distinct from its parents?
Answers
there is no image that shows a reproductive structure
Answer: The Answer is the Flower
Explanation: I got it right on Edmentum, hope this helps.
I scored myself by accident but it is right.
Which characteristic mentioned in the key do the spider and insect share?
A. Has wings
B. Has antennae
C. Has no backbone
D. Has no legs
Answers
Answer:
Has no backbone
Explanation:
Ap3x
Tae formation of fossil fuels is a process that takes millions of years and
starts with energy from the Sun. The Sun contributes to the formation of
fossil fuels by -
A) generating winds, so humans use less fossil fuels
B) giving off heat, similar to burning fossil fuels
C) giving energy to the living things that become fossil fuels
D) heating up the Earth's core where fossil fuels form
Answers
Answer:
D
Explanation:
It was a long time ago when the crust was still molten lava. The ground basically buried the fossil fuels and that's why it makes imprints.
why carbohydrate digestion occurs first in mouth?
Answers
The digestion of starch carbohydrate is initiated in mouth due to the action of starch digesting enzyme ptyalin or salivary amylase present in saliva secreted by salivary glands. Enzymatic hydrolysis helps in the partial breakdown of starch (polysaccharide) into maltose and isomaltose (disaccharides) and small dextrins called 'limit' dextrins. Nearly 30% of the starch is hydrolysed in the oral cavity because of the shorter time the food is retained here
due to the action of starch the carbohydrate digestion occurs first in mouth
Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?
Answers
Answer: Replacement Reaction
place the steps involved in the reaction between a carboxylic acid and an amine in the presence of dcc in the correct order, starting with the first step at the top of the list. (not all steps are represented here.)
Answers
Top of the list is the first action involved in between a carboxylic acid with an amine, is:
The COOH group assaults the DCC's core C.A neutral intermediate is produced via proton transfer.The carbonyl carbon atom is attacked by the amine, and dicyclohexylurea is destroyed.An amine can be used to replace a carboxylic acid during nucleophilic substitution to generate a favorable leaving group, which can then be replaced by an amide to form the matching amide. Below is a breakdown of the reaction steps: Acid deprotonation is the first step. Step 2: The carboxylate launches a nucleophilic assault.
Because amines are basic and frequently convert carboxylic acids to their very unreactive carboxylates, it is challenging to convert a carboxylic acid directly to an amide. A good leaving group is created in this reaction by the addition of the carboxylic acid to the DCC molecule, which can then be replaced by an amine during nucleophilic substitution. In the synthesis of peptides, an important step is DCC-induced coupling to generate an amide bond.
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List five difference between parasitism and saprophytism
Answers
Heterotrophic mode of nutrition
This type of nutrition can be categorized into parasitic mode, saprophytic mode and symbiotic mode of nutrition.
Parasitic mode:
In parasitic mode of nutrition, plants depend on other live plants or animals for their nourishment. Such plants are called as parasites and the ones on which parasites depend are called as hosts.
The insectivorous mode of nutrition is observed in plants like pitcher plant and the Venus fly trap. They purely depend on other insects and small animals for their nutrition.
Cuscuta is a parasitic plant which develops special roots called haustoria. Haustoria penetrate deep into host plant tissues and just absorb the nutrients from them.
Saprophytic mode:
The plants which exhibit saprotrophic mode of nutrition are called as saprotrophs. Saprotrophs are the plants that obtain their nutrition from dead and decaying organic matter. Saprotrophs secrete digestive juices onto dead and decaying matter to dissolve it and then absorb nutrients from it.
Examples of parasitic mode of nutrition are:
1.Tapeworms are segmented flatworms that attach themselves to the insides of the intestines of animals such as cows, pigs, and humans. They get food by eating the host's partly digested food, depriving the host of nutrients.
2.Fleas harm their hosts, such as dogs, by biting their skin, sucking their blood, and causing them to itch.
3. Barnacles, which live on the bodies of whales, do not seriously harm their hosts, but they do itchi g bcoz of barnacles.
Some examples of plants having saprophytic nutrition are as follows:
Corallorhiza trifida
Dipodium punctatum
Galeola septentrionalis
Monotropa uniflora
Neottia nidus-avis
So, like I wrote above, the mode of nutrition in which an organism obtains nutrients from dead and decaying organic matter is called saprophytic nutrition. Example - Rhizopus (bread mould), Mucor (pin mould), Yeast, Agaricus (mushroom) .
Question 5 of 5
Which two statements are true for both compounds and mixtures?
A. Their particles all have the same chemical formula.
B. Their particles are held together by chemical bonds.
C. They can be separated into two or more elements.
D. They are made up of more than one type of atom.
SUBMIT
Answers
The two statements that are true for both compounds and mixtures are:
Their particles are held together by chemical bonds.
They are made up of more than one type of atom.
Options B and D are correct.
How do we know?It is general knowledge that compounds and mixtures are made up of more than one type of atom.
In compounds, the atoms of different elements combine in fixed ratios to form distinct chemical compounds.
On the other hand, in mixtures, different substances which may be elements or compounds are known to be physically mixed together without forming new chemical compounds.
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Need help on this question
Answers
The scratches on the bedrock suggest that the continents were once connected nearer to the South Pole, and the ice flowed from the South Pole.
What are continents?A continent is one of the earth's large land masses that is part of the earth's crust that rises above the oceans and is composed of sialic rocks.
Asia, Africa, North America, South America, Antarctica, Europe, and Australia make up the continents, in order of largest to smallest. Geographers typically list every island that is connected to a continent when describing it.
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If the anterior pituitary began overproducing FSH due to a tumor, and it no longer responds to normal feedback mechanisms; what would happen
Answers
If the anterior pituitary began overproducing FSH due to a tumor, then the levels of inhibin would increase.
What is inhibin?The inhibin protein is a crucial factor involved in the generation of follicle-stimulating hormone (FSH) present in the body.
Inhibin protein is generated by specialized cells such as Sertoli cells (males) and granulosa cells (females).
In males, inhibin protein concentration in the blood is correlated to sperm (male gametes) count.
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Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synthase survive and grow. The mutant cells grow because the medium contains the___________ they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to________ . The methotrexate inhibits , so cannot be regenerated. Without a supply of___________ for the synthesis of nucleotides and amino acids, the cells die.
Answers
Answer:
*Thymidine
*THF to DHF
*THF
Explanation:
Normal cells die in a nutrient medium containing thymidine and methotrexate, whereas mutant cells defective in thymidylate synthase survive and grow. The mutant cells grow because the medium contains the_____Thymidine______ they are unable to make normal cells, however, continue to synthesize their own and thereby convert their limited supply of to__THF to DHF______ . The methotrexate inhibits , so cannot be regenerated. Without a supply of______THF_____ for the synthesis of nucleotides and amino acids, the cells die.
NOTE:
THF means Tetrahydrofolate
DHF means Dihydrofolate
Thymidine which is also reffered to as deoxythymidine, is described as a deoxynucleoside that is composed of the pyrimidine base thymine that is attached to the sugar deoxyribose. Thymidine is a nucleoside made up of pentose sugar, pyrimidine base tymine and deoxyribose, it is one of the the four nucleoside found in exclusively DNA as well as T-loop of tRNA.
Tetrahydrofolate also known as tetrahydrofolic acid can be described as part of folic acid that function as a coenzyme which aid metabolic reactions that includes nucleic acid and amino acids. It is also reffered to as one-carbon metabolism, and it's oone-carbon mechanism is associated to the histidine, serine of amino acid.
When jaw become large enough to hold the permanent teeth . The milk teeth fall and permanent teeth appear
Answers
The "exfoliation" or "shedding" of milk teeth is the name of the procedure.
What is the Dentition of Humans?The primary and permanent tooth sets make up the human dentition. Maxillary (upper) and Mandibular (lower) are the two opposing arches in which teeth are arranged. These can be split into their left and right halves along the midline (mid-sagittal plane).
Four Different Teeth Types and Their Purposes
The majority of individuals have 32 permanent adult teeth, which can be classified into four groups:
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