Following a bone fracture, the body must repair bone tissue by producing new bone cells. What is the source of these new cells?
A. adult stem cells in bone marrow
B. embryonic stem cells in bone marrow
C. adult stem cells produced in the glands
D. embryonic stem cells produced in the glands
Answers
Answer:
The periosteum is one source of precursor cells which develop into chondroblasts and osteoblasts that are essential to the healing of bone. Other sources of precursor cells are the bone marrow (when present), endosteum, small blood vessels, and fibroblasts.
Related Questions
What’s the information of the lab: mouse genetics (one trait )
Answers
For genetic reasons, that mouse is similar to humans and get similar diseases as humans. Thus, they are considered as ideal model organism.
What is mean by trait?Trait is also called as phenotype, which describes specific characteristic of an individual.
Traits can be classified as qualitative as well as quantitative that means these are the characteristics which can either be measured or described. It can be behavioral or physical.
Mouse share 80% genome with humans therefore, they are used as model for human diseases by modification of its DNA.
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Why
are
fungi classified as heterotrophs like animals?
Answers
Answer:
Fungi is heterotypic animal because it takes its diet from its food chain like other animals.
Explanation:
Like animals fungi are also heterotrophs. Fungi use the complex compound in the form of carbon rather then fixing of carbon dioxide from the environment.
Most of the plants and some bacteria do the same things. Fungi does not fix nitrogen as well from the environment. Like other animals fungi takes other nutrients such as from diet. Some of the fungi multiply a-sexually and some fungi do have a-sexual and sexual reproduction with the alternation of generation. The fungi is used to commercial food industry to make the yeast for baking, brewing and for making cheese and wine. It is used for fermentation. It is also use in the form of enzymes and bacteria.
The microscopes we use today are far more complex than those first microscopes like the one used in the 1600s by Anton van
Leeuwenhoek. Despite the limitations of his simple microscope, van Leeuwenhoek observed some cells he termed
"animalcules." Robert Hooke then coined the term "cell" for the box-like structures he observed when viewing cork tissue
through a lens. Later advances in lenses, microscope construction, and staining techniques enabled other scientists to see
some components inside cells. Just as the microscope has been a work in progress with advances that have led to our current
technology, so the cell theory changed as new discoveries changed the understanding of cells.
Which of these contributed to the cell theory? Select ALL that apply.
A)
Robert Brown discovered the nucleus of plant cells.
B)
Matthias Schleiden discovered that plants are made of cells.
o)
Rudolf Virchow proved that cells come from preexisting cells.
D)
Theodor Schwann discovered that animals are composed of cells.
E)
Karl Rudolphi conducted experiments that proved cells had their own cell
walls.
Answers
The microscopes we use today are far more complex than those first microscopes like the one used in the 1600s by Anton van Leeuwenhoek. Robert Brown discovered the nucleus of plant cells, and Karl Rudolphi conducted experiments that proved cells had their own cell walls.
What is microscope?
The instrument that is used to observe tiny particles as well as objects or cell of the body has been known as microscope. One lens in the microscope has been used to magnify the image at least once. The main function of the lens has to bend the light in the direction of the eye and forms the larger image of the object.
There are several types of microscope and these are electron microscope,scanning probe microscope, stereomicroscope, simple microscope, and light microscope.The main function of the lens has to bend the light in the direction of eye and forms the larger image of the object.
Each microscope have different function and ability to observe the object. As we know that the size of the cell has very small and it has impossible to observe it without microscope. So, microscope helps to observe the interior part of the cell and it will help in the study of different part of cell.
Therefore, The microscopes we use today are far more complex than those first microscopes like the one used in the 1600s by Anton van Leeuwenhoek.
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second messengers tend to be water-soluble and small. this accounts for their ability to __________.
Answers
Answer:float
Explanation:floating
Streams that disappear into sinkholes are a sure sign of karst land.
Select one:
True
False
Answers
Answer:
Explanation:
true
Why is sunlight necessary for photosynthesis?
Answers
Answer:
Sunlight provides the energy needed for photosynthesis to take place. In this process carbon dioxide and water are converted into oxygen (a waste product that is released back into the air) and glucose (the source of energy for the plant).
The molecules which move large molecules into and out of the cell are known as
Answers
Answer:
"Endocytosis" is a type of active transport that moves particles, such as large molecules, parts of cells, and even whole cells, into a cell.
Explanation:
Hope It Helps
Water molecule, H2O Oxygen molecule, O2
When the two substances are put in the same container, they do not attract
each other. Why does this happen?
O A. They both contain oxygen.
B. They contain different elements,
C. One is polar, and one is nonpolar.
O D. They are both nonpolar.
Answers
Which of the following is NOT a true statement regarding the blood-brain barrier (BBB)? O it prevents passage of possible therapeutic drugs it prevents the flow of proteins across it O it allows easy passage of lipid-soluble substances O it consists mainly of gap junctions astrocytes play a primary role
Answers
The statement it allows easy passage of lipid soluble substances is NOT true regarding the blood-brain barrier BBB. The blood brain barrier BBB is a highly selective and tightly regulated barrier that separates the brain from the circulating blood.
Its main function is to protect the brain from harmful substances, such as toxins and pathogens, while allowing essential nutrients to pass through. The blood brain barrier BBB prevents the passage of possible therapeutic drugs and the flow of proteins across it, as they are usually too large and cannot pass through the tightly packed endothelial cells that line the blood vessels in the brain.
Instead, lipid soluble substances, such as oxygen, carbon dioxide, and certain drugs, can pass through the BBB by diffusion. The BBB consists mainly of tight junctions that connect the endothelial cells and limit the movement of substances between them. Astrocytes also play a primary role in the regulation of the BBB by releasing signaling molecules that control the permeability of the barrier.
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Which tissues are in both leaves and roots? (Select all that apply.)
xylem
phloem
stomata
pistil
Answers
it’s xylem i’m pretty sure :)
Answer:
the answer is phloem and xylem
Explanation:
they are both in the leave and the roots.
What is the most effective method used in controlling pests?
Answers
The strategy to pest control that is most frequently utilized is chemical pest control. Infestations of weeds and crop diseases are frequently managed with their help.
Chemical pest control agents that typically poison and kill the pest that consumes them or comes into contact with them are referred to as pesticides. These can be used alone, in conjunction with actual traps, or simply put out in areas where pests are known to congregate.
Ultra-low volume (ULV) fogging, which uses small amounts of insecticide to manage insect infestations, is another chemical pest control technique.
The main benefit of chemical pest treatment is that it effectively gets rid of pests and produces results rather quickly.
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The incidence of Green spots, a recessive genetic disorder in the butterfly population of United States, 45%. Green spots are cause by the double recessive genotype. What is the dominant allelic frequency in this population? A. 0.33 B. 0.67 C. 0.36
Answers
The dominant allelic frequency in this population will be 0.33. The correct option is A.
What is allele?An allele as a variant of the same sequence of nucleotides at the same location on a lengthy DNA molecule.
The variant DNA sequences at a locus are known as alleles, and the chromosomal or genomic location of a gene or any other genetic element is referred to as a locus.
We know that:
p + q= 1
p = 1 - 0.45
p = 0.55
\(p^2=0.33\\\)
Thus, the correct option is A.
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s you read your textbook, note the similarities and differences between the different land biomes and aquatic ecosystems. there will be more than 1 biome that fits into each feature, and each biome can be used more than once. record your work in the table.
Answers
These are environments found in water, either freshwater or marine. Examples include lakes, rivers, estuaries, and coral reefs.
What kind of environment found in water?
As I cannot view the specific textbook or table you are using, I will provide general information about the similarities and differences between land biomes and aquatic ecosystems. Please refer to your textbook and adjust the information accordingly.
Land biomes: These are large regions defined by their climate, vegetation, and animal life. Some examples include forests, grasslands, and deserts.
Similarities: Land biomes share features such as soil type, precipitation levels, and temperature ranges. They also contain diverse plant and animal life adapted to the specific conditions.
- Differences: Land biomes differ in climate, vegetation, and animal life. For example, forests are characterized by a high density of trees, while grasslands have predominantly grasses and deserts have little vegetation.
Aquatic ecosystems: These are environments found in water, either freshwater or marine. Examples include lakes, rivers, estuaries, and coral reefs.
Similarities: Aquatic ecosystems share features such as water depth, salinity, and temperature. They also contain diverse aquatic plants and animal life adapted to the specific conditions.
Differences: Aquatic ecosystems differ in the type of water (freshwater or marine), water movement, and available sunlight. For example, lakes are still bodies of freshwater, while rivers have flowing freshwater. Estuaries are where freshwater meets marine water, and coral reefs are marine ecosystems with high biodiversity.
To record your work in the table, you can list each biome and aquatic ecosystem, then note their similarities and differences based on the features mentioned above. Please refer to your textbook for specific examples and more detailed information.
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Housing rats in a complex social environment with much stimulation leads to some changes in brain structure, including __________:
a) increased cortical mass.
b) all of the given answers
c) increased dendritic branching of cortical neurons.
d) prolonged neural health, well into senescence.
Answers
Housing rats in a complex social environment with much stimulation leads to some changes in brain structure, including b) all of the given answers.
Housing rats in a complex social environment with much stimulation can result in various changes in brain structure. These changes include increased cortical mass, increased dendritic branching of cortical neurons, and prolonged neural health, well into senescence. The complex social environment provides opportunities for social interactions, cognitive stimulation, and physical activity, which can lead to enhanced brain development and plasticity. Increased cortical mass suggests structural adaptations in the brain, potentially indicating improved cognitive abilities. The increased dendritic branching of cortical neurons signifies increased synaptic connections and neural complexity, which can enhance information processing and learning. Prolonged neural health into senescence suggests that the enriched environment may have a protective effect against age-related cognitive decline. Overall, a complex social environment with stimulation has a positive impact on brain structure in rats.
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Can you tell from this tree whether a C at position 15 evolved before or after a T at position 15? Explain your answer
Answers
The evolutionary tree is not observed here but it is possible to answer this question by observing which nucleotide is found in the root of the node. It indicates the first substitution.
What is an evolutionary tree?A phylogenetic evolutionary tree is a diagram used to show the evolution of a given taxonomic group (for example, a group of species).
It is possible to trace the evolution of a given taxon by tracing the nucleotide substitution observed from a common ancestor.
In an evolutionary tree, the root of the node is represented by the common ancestor and therefore the presence of a particular nucleotide (either T or C) in that position can be considered as the ancestral character.
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a sample of double-stranded dna contains 28% thymine. approximately what percent of the nucleotides in this sample will be guanine? a) 8% b) 16% c) 22% d) 72%
Answers
The answer is c) 22%. In a double-stranded DNA molecule, the nucleotides always pair up in a specific way: adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).
Given that the sample contains 28% thymine (T), there must also be 28% adenine (A) because A pairs with T. So, together A and T make up 56% of the nucleotides.
Since the total percentage of nucleotides must equal 100%, the remaining percentage (100% - 56%) is 44%, which is the combined percentage of cytosine (C) and guanine (G).
Since C and G pair together, they must have equal percentages. Therefore, guanine (G) makes up half of the 44%, which is 22%. So, approximately 22% of the nucleotides in this sample will be guanine.
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helpppp me pleaseeeeeeeeee
Answers
the inspiratory center is located in what part of the nervous system?
Answers
The inspiratory center is located in the medulla oblongata, which is a part of the autonomic nervous system responsible for regulating basic life-sustaining functions such as breathing, heart rate, and blood pressure.
The medulla oblongata is a region located at the base of the brainstem, connecting the brain to the spinal cord. It is responsible for controlling vital functions such as breathing, heart rate, and blood pressure. Within the medulla oblongata, specific groups of neurons form the inspiratory center, which regulates the initiation and coordination of the inspiratory phase of breathing.
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define acidic and basic dyes. what is the purpose of each
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Acidic dyes are used to stain backgrounds or extracellular structures, while basic dyes are used to stain cellular components within cells. Acidic dyes bind to positively charged structures, while basic dyes bind to negatively charged structures, allowing for the visualization and differentiation of various cellular components.
Acidic dyes: Acidic dyes are water-soluble dyes that are negatively charged. They bind to positively charged components in cells, such as proteins or nucleic acids. Acidic dyes are often used to stain backgrounds or extracellular structures due to their affinity for the negatively charged substances. They have poor affinity for cell structures and tend to be repelled by the negatively charged components inside cells. Examples of acidic dyes include eosin, orange G, and acid fuchsin.
The purpose of acidic dyes is to provide contrast and highlight cellular structures by staining the background or extracellular matrix. They help visualize and differentiate different tissues or cell components by contrasting with the stained structures. Acidic dyes are commonly used in histology and cytology to highlight specific elements or structures in a sample.
Basic dyes: Basic dyes, also known as cationic dyes, are water-soluble dyes that are positively charged. They bind to negatively charged components in cells, such as nucleic acids (DNA and RNA) and certain acidic proteins. Basic dyes have a strong affinity for cellular structures and can penetrate cell membranes. Examples of basic dyes include methylene blue, crystal violet, and hematoxylin.
The purpose of basic dyes is to stain cellular components, such as nuclei, nucleoli, or acidic organelles, by binding to their negatively charged constituents. Basic dyes allow for the visualization of specific cellular structures and can be used in a variety of staining techniques, including Gram staining, nuclear staining, and cytoplasmic staining.
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what type of information is available in this interactive? choose all that apply. check all that apply type of aquatic biome determined by annual precipitation and average temperature type of aquatic biome determined by annual precipitation and average temperature type of terrestrial biome determined by annual precipitation and average temperature type of terrestrial biome determined by annual precipitation and average temperature flora and fauna typical of each biome flora and fauna typical of each biome distribution of each biome on a world map distribution of each biome on a world map changes to biomes expected from climate change changes to biomes expected from climate change climograph of an example location for each biomeclimograph of an example location for each biome
Answers
The available information in this interactive includes: the type of aquatic and terrestrial biomes determined by annual precipitation and average temperature, flora and fauna typical of each biome, distribution of each biome on a world map, changes to biomes expected from climate change, and climographs of an example location for each biome.
The interactive provides a comprehensive overview of different biomes and their characteristics, including their location, climate, and biodiversity. It also explores the potential impacts of climate change on these biomes. The climographs for each biome give an example of the typical climate conditions, including temperature and precipitation patterns. Overall, this interactive is a valuable resource for understanding the diversity of biomes and the ecological processes that shape them.
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what type of information is available in this interactive? choose all that apply. check all that apply type of aquatic biome determined by annual precipitation and average temperature type of aquatic biome determined by annual precipitation and average temperature type of terrestrial biome determined by annual precipitation and average temperature type of terrestrial biome determined by annual precipitation and average temperature flora and fauna typical of each biome flora and fauna typical of each biome distribution of each biome on a world map distribution of each biome on a world map changes to biomes expected from climate change changes to biomes expected from climate change climograph of an example location for each biomeclimograph of an example location for each biome?
Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called Group of answer choices latent viruses. lytic viruses. phages. slow viruses. unconventional viruses.
Answers
Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called latent viruses because latent viruses show no symptoms. option A.
Latent viruses are characterized by their ability to establish a dormant or latent state within the host cell, where they can persist for extended periods without causing apparent disease or symptoms.
Human herpesvirus 1, also known as herpes simplex virus type 1 (HSV-1), is an example of a latent virus.
After initial infection, the virus can enter a latent phase in sensory neurons, remaining inactive until reactivation occurs, which may lead to recurrent symptoms or disease.
This latent state allows the virus to evade immune responses and persist within the host, making it challenging to eliminate completely.
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Thermogenesis has been studied the plants in the genus Arum, including skunk cabbage and the corpse flower. In these plants, what hypotheses have been provided to explain the reason behind thermogenesis? Select ALL that apply
a) protection from frost damage
b) leaf production and photosynthesis.
c) seed germination.
d) heat source for pollinators
c) pollinator attraction.
Answers
Answer:
a,b,c
Explanation:
Protection from frost damage, leaf production and photosynthesis along with seed germination explain the reason behind thermogenesis.
What is thermogenesis?
The process through which organisms produce heat is known as thermogenesis. All warm-blooded creatures experience it, and a few thermogenic plant species including the Eastern skunk cabbage, the Voodoo lily, and the huge water lilies of the genus Victoria also experience it.
One of the primary purposes of transpiration, which serves as the upper terminal mover of the water circulation in plant systems, is thermoregulation. It establishes a constant water flow from the plant's root system to its leaves and other vegetative organs, uniting them into one whole.
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as we travel farther from the retina, neurons fire to _____.
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As we travel farther from the retina, neurons fire to increasingly complex and integrated visual stimuli.
Rods and cones are specialized photoreceptor cells that are found in the retina at the back of the eye and are in charge of detecting light and turning it into electrical impulses. The optic nerve subsequently relays these impulses to the brain.
Neurons activate in reaction to more complex elements of the visual picture as the visual information moves from the retina to higher layers of the visual processing pathway, such as the optic nerve, optic chiasm, and visual cortex.
Edges, forms, colors, and motion cause the neurons in these regions to become increasingly selective and receptive. Neurons are arranged into functional columns in the visual cortex, the part of the brain involved in visual processing, which is the main area.
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Assingent
State the
the use of
stir up pump
Answers
Answer:
I think its with used to mix medicinal drugs or administer them
_______ transmit impulses from the brain and spinal cord to the muscles and glands, directing body actions.
Answers
Answer: Motor Neurons
Explanation: They direct the body's actions.
thank youuuuuu
Muscles can only contract, so they occur in pairs. In the arm, the biceps muscle is a flexor-that is, it closes the limb. The triceps muscle is an extensor that opens the limb. This configuration is t
Answers
The tension in the biceps muscle T_AB can be determined as T_AB = 2W, and the magnitude of the force exerted by the forearm on the upper arm at the elbow joint C is equal to the weight of the forearm, which is 9 N.
In this scenario, the elbow joint is modeled as a simple machine, specifically a lever system. The weight of the forearm acts as the load, and the tension in the biceps muscle acts as the effort. According to the lever principle, the input force (tension in the biceps muscle) is greater than the output force (force exerted by the forearm on the upper arm at the elbow joint).
Since the weight of the forearm is given as 9 N, we can determine the tension in the biceps muscle T_AB by using the relation T_AB = 2W, which yields T_AB = 2(9 N) = 18 N. Therefore, the tension in the biceps muscle is 18 N.
The magnitude of the force exerted by the forearm on the upper arm at the elbow joint C is equal to the weight of the forearm, which is given as 9 N. This force represents the output force of the lever system at the elbow joint.
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In many green and purple bacteria, electrons to reduce co2 can come from:.
Answers
Electrons to reduce CO₂ can come from : Glucose
characteristics of green and purple bacteriaMost Non-sulphur Green and purple bacteria are photoheterotrophs because they use light as a source of energy while getting their reducing power from the electrons of glucose.
Green and purple bacteria uses sunlight but do not give out oxygen in return and they do not use only CO₂ as their carbon source, but uses electrons of glucose to reduce CO₂.
Hence we can conclude that Electrons to reduce CO₂ can come from : glucose
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glycogenissi is stimulated by whereas glycogenlolysis is stimulated by
Answers
Glycogenesis is stimulated by insulin, while glycogenolysis is stimulated by glucagon and epinephrine.
Glycogenesis is the process of converting glucose into glycogen for storage in the liver and muscle cells. Insulin is released when blood glucose levels are high, signaling the body to store excess glucose as glycogen.
On the other hand, glycogenolysis is the breakdown of glycogen into glucose when the body needs energy.
Glucagon and epinephrine are released when blood glucose levels are low, stimulating glycogenolysis to provide glucose for cellular functions. Both processes play essential roles in maintaining blood glucose levels within a healthy range.
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Chemical digestion of food starts in the __________. chemical digestion of food starts in the __________.
a. small intestine
b. stomach
c. mouth
d. large intestine
Answers
Answer:
Chemical digestion of food starts in the mouth.
Explanation:
This begins with saliva. This saliva acts as a digestive juice so the food can move more easily through the esophagus into the stomach. Also, saliva has an enzyme that begins to break starches in the food. Hope this helped :)
A set of biology exam scores are normally distributed with a mean of 707070 points and a standard deviation of 666 points. Let xxx represent the score on a randomly selected exam from this set.
Answers
P=0.68 for A set of biology exam scores are normally distributed with a mean of 70points and a standard deviation of 6 points and x represent the score on a randomly selected exam from this set.
mean=70, standard deviation = 6.
from the table, z value = 1 and it is 0.15866.
P(x<64)=0.15866.
Similarly, the value for z=0.67 is 0.84134, so
P(x<76)=0.84134
thus, P(64 < x < 76) = 0.84134 - 0.15866 = 0.68268
A measure of a group of values' friction or dissipation in statistics is called the standard divition. When the standard divagation is low, the values are more likely to fall within a narrow range, also known as the anticipated value, whereas when the SD is high, the values tend to be near to the mean. The lower case Greek letter sigma, which stands for the population SD, or the Latin letter s, which stands for the sample SD, are most constantly used in fine equations and textbooks to represent SD.
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