A student who was trying to determine the concentration of escherichia coli in a sample completed a total plate count assay. After plating 1ml of the 10-6dilution tube and incubating the plate at 37C for 24 hours the student counted 210 colonies on the plate. What is the cfu/ml of the original sample?.
Answers
The cfu/ml of the original sample of escherichia coli is 2.1*10^8.
Concentration in chemistry can be calculated by dividing a constituent's abundance by the mixture's total volume. The concentration of the escherichia coli in a sample determined by a student would be 2.1*10^8. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.
Any type of chemical combination can be referred to by the term "concentration," however solutes and solvents in solutions are most usually mentioned. There are many types of molar (quantity) concentration, including normal concentration and osmotic concentration, the practice or act of focusing: the quality of being focused, especially: giving all of one's attention to one thing. A concentration inside a major or a major's academic major. The student decided to concentrate on law.
To know more about concentration refer to: brainly.com/question/26811246
#SPJ4
Related Questions
the _________ portion of your femur (thigh bone) forms part of the knee joint.
a.proximal
b.medial
c.leteral
d.distal
e.anterior
Answers
The distal portion of your femur (thigh bone) forms part of the knee joint. The answer is OPTION D
Your knee joint's top is made up of the lower (distal) end of your femur. It connects to your patella (knee cap) and tibia (shin). It consists of the lateral and medial condyles. The proximal end of the tibia, the patella, and the distal end of the femur make up the knee's bone components.
The quadriceps tendon and patellar ligament serve as attachment points for the patella, which is the biggest sesamoid bone in the body. The ulna, which is located on the medial side of the forearm, and the radius, which is located on the lateral side, are connected by two joints called the radioulnar joints. The answer is OPTION D
To learn more about distal, click here.
https://brainly.com/question/10918947
#SPJ4
lecting all
A model of one stage of mitosis is shown here. Draw conclusions about what happens in the NEXT Stage of mitosis
the answers that apply.
)
A)
chromatids will separate
B)
spindle fibers wilU form
chromosomes will condense
D)
nuclear membrane will disappear
E)
chromatids will move to opposite poles
Answers
Under the hypothesis of blending inheritance, what color(s) would the offspring of a black cat and a white cat be
Answers
Under the hypothesis of blending inheritance, the offspring of a black cat and a white cat would be GREY. This theory is not now accepted.
Blending inheritance is an erroneous theory from the 19th century that proposed that offspring inherit phenotypic traits as 'average values' observed for such traits in their parents.
Mendel's laws of heredity (i.e., the Law of Segregation and the Law of Independent Assortment) showed that blending inheritance is based on erroneous concepts.
Moreover, incomplete dominance is an inheritance pattern different from blending inheritance because incomplete dominance refers to the observation that in certain traits both gene variants or 'alleles' are expressed in heterozygous individuals.
Learn more in:
https://brainly.com/question/1429818
what antibiotic is often used as a ""last resort"" for penicillin resistant gram positive organisms?
Answers
What is the difference between the normal respiratory system and the deep respiratory system?
Answers
Answer: Breathing occurs through respiratory organs, including the nose, lungs, etc. Respiration takes place in cells and cell organelles, including mitochondria, etc. From the differences given, we can conclude that breathing and cellular respiration are two different processes and cannot be used interchangeably.
Explanation:
Brainliest pls:)
Answer:
Explanation:
Both are the process of taking O2 and releasing CO2, the amount of useless gas used in 1 unit of time is the same.
Normal respiration: more 'shallow' inhalation and breathing
diaphragm, the intercostal muscles (the muscles involved in breathing) are weaker
Deep breathing: breathing rhythm, breathing deeper
more active respiratory muscles
More gas is taken into the body
=> Helps the body to be healthy, good tolerance, high respiratory efficiency (more O2 intake)
(Example: holding breath longer than normal breathing; deep breathing people dive better than normal breathing people)
The simulation shows a game of tug-of-war. Place a blue team and a red team with same-sized people on each side of the rope. What can you say about the sizes of the left and right arrows?
Answers
The sizes of the left and right arrows should be the same.
In the game of tug-of-war, the sizes of the left and right arrows represent the relative strengths of the blue team and the red team. If the blue team is stronger and pulling harder, the size of the left arrow would be larger than the size of the right arrow.
Conversely, if the red team is stronger, the size of the right arrow would be larger than the size of the left arrow. The sizes of the arrows indicate the force exerted by each team and provide a visual representation of the balance of power in the game.
In tug-of-war, the objective is for one team to overpower the other and pull the rope towards their side. The larger the arrow representing a team's strength, the greater their force and ability to move the rope in their direction.
The size of the arrows serves as a visual cue for spectators to understand which team has the advantage at any given moment. It helps to create a sense of competition and excitement as the teams struggle to gain control of the rope.
For more such answers on sizes
https://brainly.com/question/1502078
#SPJ8
_____ is the oldest possible age that members of a species can attain, whereas _____ is the number of years the average newborn in a particular population group is likely to live.
Answers
Maximum life span is the oldest possible age that members of a species can attain, whereas average life expectancy is the number of years the average newborn in a particular population group is likely to live.
What is life span?Every living organisms pass through birth, growth, reproduction, old age, death. this period is called as life span.
What is death?When all life activities are stopped in an individual organisms due to various reasons like ageing, disease, accidents, etc. it is called death.
Also some fully grown living organisms divides physically into two daughters, thus ending its independent existence.
What is living?The objects with specific form and structure exhibits growth, development, reproduction, responsiveness and other unique characteristics of life. it is called living beings.
The living world is wonderful with wide range of living organisms. the earth is populated by various types of plants and animals.
Life is a complex organization of chemical molecules that express itself by chemical reactions leading to specific characteristics like cellular structure, growth, development, reproduction, adaptation, consciousness, death, etc.
Learn more about living here :
brainly.com/question/5836819
#SPJ4
Explain how the population of rock pocket mice changed fur color over time.
Answers
Answer:
Most genes are identical, but dark and light rock pocket mice differ in one gene (Mc1r; 4:55). Data from Data Set 2 show that a mouse's genotype for the MC1R gene affects their fur color. Mice with two copies of allele 2 have the darkest fur.
Explanation:
thank me later
the current research shows the link between obesity and the microbiome is likely based on the choose one: a. absence of protists in the microbiome. b. specific species composition of the microbiota. c. food types ingested by the host. d. genetics of the host in terms of propensity for inflammatory disorders.
Answers
The link between obesity and the microbiome is likely to be specific species composition of the microbiota.
Energy expenditure and food metabolism are both influenced by the gut microbiome. Additionally, several methods of treating obesity have been demonstrated to alter the diversity and make-up of the gut microbiome. The development of metabolic illnesses linked to obesity, such as type 2 diabetes, NAFLD, metabolic syndrome, and cardiovascular disease, may be influenced by alterations in the gut microbiota.
To learn more about obesity click here:
https://brainly.com/question/29024109
#SPJ4
Organic compounds are used as building blocks for *
Answers
Answer: Organic compounds are used as building blocks for water, DNA, and starches water, proteins, and oxygen proteins, DNA, and carbon dioxide proteins, starches, and fats
water, DNA, and starches
water, proteins, and oxygen
proteins, DNA, and carbon dioxide
proteins, starches, and fats
Explanation:
pok is in the lab and is measuring the resting potential of neurons. approximately what should she measure as the resting potential?
Answers
Pok is in the lab measuring the resting potential of neurons, which is crucial to understand their function. Approximately, she should measure the resting potential to be around -70 millivolts (mV). This negative value indicates that the neuron's inside is more negatively charged than the outside.
The resting potential is maintained by the selective permeability of the neuronal membrane and the presence of ion pumps, such as the sodium-potassium pump. This pump actively moves 3 sodium ions (Na+) out of the cell and 2 potassium ions (K+) in, contributing to the negative charge inside the neuron.
The resting potential plays a vital role in the neuron's ability to generate an action potential, which is essential for transmitting signals. When a stimulus causes the membrane potential to become less negative (depolarization), it may trigger an action potential if it reaches a certain threshold.
Understanding and measuring the resting potential allows researchers like Pok to gain insight into the basic functioning of neurons and their role in transmitting information throughout the nervous system.
For more such questions on neurons, click on:
https://brainly.com/question/11538106
#SPJ11
What type of nucleic acid is composed
of only one strand of nucleotides?
A. Sugar
B Fat
C DNA
D RNA
Answers
Answer:
option D is correct
Explanation:
RNA is a type of nucleic acid which is composed of single strand of nucleotide
After running a chemical test of the contents of a human cell, Dr. Rogers cannot find any pyruvate molecules. He correctly determines that
The cell needs more water
The electron transport chain works too fast
Fermentation is occurring
Glycolysis is not occurring
Answers
Answer:it’s the last one
Explanation:
He correctly determines that Glycolysis is not occurring. So, the correct option is (D).
What is Glycolysis?Glycolysis is defined as the metabolic pathway which converts glucose to pyruvate. The free energy released in glycolysis is used to form the high-energy molecule Adenosine Triphosphate (ATP) and the reduced Nicotinamide Adenine Dinucleotide. This is a sequence of ten reactions which is catalyzed by enzymes.
This is the series of reactions which extract energy from glucose by splitting it into two three-carbon molecules known as Pyruvates.
The main function of glycolysis is to provide pyruvate for the another cycle known as TCA cycle. This glycolytic production of pyruvate reduces the cytosol by increasing the ratio of NADH [a reduced form of NAD+ (nicotinamide adenine dinucleotide)] to NAD+.
Thus, he correctly determines that Glycolysis is not occurring. So, the correct option is (D).
Learn more about Glycolysis, here:
https://brainly.com/question/14076989
#SPJ2
FEMALE REPRODUCTIVE SYSTEM QUESTIONS: 1. Describe and give the functions of the different structures of the female reproductive system. 2. Name the hormones produced by the ovaries. Give their actions. 3. Explain briefly the phases of menstrual cycle. 4. Define: a. Menopause b. Mastectomy c. Salpingitis d. Ectopic pregnancy e. Hysterectomy f. Amenorrhea g. Dilatation and curettage
Answers
The female reproductive system is made up of the following structures; Ovaries, Fallopian tubes, Uterus, Cervix and Vagina.
What are the functions?Ovaries: The ovaries are two small, oval-shaped organs located in the pelvis. The ovaries produce eggs (ova) and hormones, including estrogen and progesterone.
Fallopian tubes: The fallopian tubes are two narrow tubes that connect the ovaries to the uterus. The fallopian tubes allow the eggs to travel from the ovaries to the uterus.
Uterus: The uterus is a muscular organ that is located in the pelvis. The uterus is where a fetus grows during pregnancy.
Cervix: The cervix is the narrow opening at the bottom of the uterus. The cervix connects the uterus to the vagina.
Vagina: The vagina is a muscular tube that connects the cervix to the outside of the body. The vagina is used for sexual intercourse and childbirth.
The functions of the female reproductive system include:
Producing eggs: The ovaries produce eggs (ova) on a monthly basis.
Producing hormones: The ovaries produce hormones, including estrogen and progesterone. Estrogen and progesterone are responsible for the development of secondary sex characteristics, such as breasts and hips, and for the regulation of the menstrual cycle.
Providing a place for a fetus to grow: The uterus provides a safe place for a fetus to grow during pregnancy.
Giving birth: The vagina is used for childbirth.
2. The ovaries produce the following hormones:
Estrogen: Estrogen is a hormone that is responsible for the development of secondary sex characteristics, such as breasts and hips, and for the regulation of the menstrual cycle.Progesterone: Progesterone is a hormone that prepares the uterus for pregnancy.3. The menstrual cycle is a monthly cycle of changes in the female reproductive system. The menstrual cycle is divided into four phases:
Menstruation: Menstruation is the shedding of the lining of the uterus. Menstruation usually lasts for 3-7 days.Follicular phase: The follicular phase is the phase of the menstrual cycle that begins after menstruation and ends with ovulation. During the follicular phase, an egg (ovum) matures in one of the ovaries.Ovulation: Ovulation is the release of an egg from an ovary. Ovulation usually occurs 14 days before the next menstrual period begins.Luteal phase: The luteal phase is the phase of the menstrual cycle that begins after ovulation and ends with menstruation. During the luteal phase, the ovary produces progesterone, which prepares the uterus for pregnancy.4. Definitions:
a. Menopause: Menopause is the natural cessation of menstruation. Menopause usually occurs between the ages of 45 and 55.
b. Mastectomy: Mastectomy is the surgical removal of one or both breasts. Mastectomy is often performed as a treatment for breast cancer.
c. Salpingitis: Salpingitis is an inflammation of the fallopian tubes. Salpingitis is often caused by a sexually transmitted infection (STI).
d. Ectopic pregnancy: Ectopic pregnancy is a pregnancy that occurs outside of the uterus. Ectopic pregnancies are often life-threatening.
e. Hysterectomy: Hysterectomy is the surgical removal of the uterus. Hysterectomy is often performed as a treatment for uterine fibroids, endometriosis, or heavy menstrual bleeding.
f. Amenorrhea: Amenorrhea is the absence of menstruation. Amenorrhea can be caused by a variety of factors, including pregnancy, menopause, and hormonal imbalances.
g. Dilatation and curettage (D&C): D&C is a medical procedure that is used to remove tissue from the uterus. D&C is often performed to diagnose or treat a medical condition, such as an abnormal uterine bleeding.
Find out more on female reproductive system here: https://brainly.com/question/25957324
#SPJ4
What best describes the evolutionary theory
Answers
The evolutionary theory, also known as the theory of evolution, is a scientific explanation for the diversity and adaptation of life on Earth the theory of evolution is considered one of the fundamental principles of modern biology and has significantly shaped our understanding of the natural world.
It was proposed by Charles Darwin in the mid-19th century and has since been widely accepted and supported by substantial evidence from various scientific disciplines.
At its core, the evolutionary theory states that all species of organisms on Earth share a common ancestor and have gradually changed over time through the processes of variation, selection, and inheritance.
This theory is based on the principles of natural selection, which suggests that individuals with traits that increase their chances of survival and reproduction are more likely to pass on those traits to the next generation.
According to evolutionary theory, the accumulation of small, advantageous variations over long periods leads to the development of new species.
This process, known as speciation, occurs through mechanisms such as genetic mutations, genetic drift, and gene flow.
The theory of evolution also explains the concept of adaptation, where organisms become well-suited to their environments through the natural selection of beneficial traits.
This adaptation allows them to better survive and reproduce in their specific ecological niches.
Over the years, the evidence supporting the evolutionary theory has expanded, including fossil records, comparative anatomy, embryology, molecular biology, and observations of natural selection in action.
For similar questions on evolutionary theory
https://brainly.com/question/1909579
#SPJ8
In the first 10 weeks of a resistance training program, the gains in strength are due primarily to Group of answer choices neural adaptations hypertrophy hyperplasia increased muscle fiber size
Answers
Answer:
The correct answer is A: Neural Adaptations
Explanation:
From zero to ten weeks of starting a resistance training program, the above gains in strength happen as a result of Neural Adaptations
Strength training helps improve and increase the motor neuron pathways that strengthen the coordination between the brain and the body of the athletes during repetitive motion.
Cheers!
How do homologous features display evidence of divergent evolution
Answers
answer
Homologous structures are present in many different species that share a common ancestor. the structure are anatomically similar and persist in the different species.
This is evident of divergent evolution because it shows that different animals come from a common ancestor but evolve o become different species from each other.
Which molecule changes as a result of a genetic engineering procedure?
A.) Amino Acid
B.) Carbohydrate
C.) Lipid
D.) Nucleic Acid
Answers
PLEASE CHOOSE ALL 3 CORRECT ANSWERS! WILL MARK BRAINLIEST IF CORRECT
Which of the following are true of the transfer of thermal energy in the oceans? Select the three correct answers. (2 points)
Energy is absorbed more than radiated near the equator.
Energy is carried from the equator to poles in deep ocean currents.
Energy is carried from the equator to poles in surface currents.
Energy is radiated more than absorbed near the equator.
Energy is absorbed more than radiated near the poles.
Energy is radiated more than absorbed near the poles.
Answers
Answer:
Energy is absorbed more than radiated near the equator.
Energy is radiated more than absorbed near the poles.
Energy is absorbed more than radiated near the poles.
In a bacterium that possesses antibiotic resistance and the potential to persist through very adverse conditions, such as freezing, drying, or high temperatures, dna should be located within, or be part of, which structures?.
Answers
In a bacteria that possesses antibiotic resistance and the potential to persist through very adverse conditions, the DNA should be located in the plasmid.
What is a plasmid?Plasmid is a small, extrachromosomal DNA molecule within a cell that is independent of the chromosomal DNA and can replicate on its own.
The plasmid usually contains extra genes that codes for resistance and other specific traits.
Therefore, it can be said that in a bacteria that possesses antibiotic resistance and the potential to persist through very adverse conditions, the DNA should be located in the plasmid.
Learn more about plasmid at: https://brainly.com/question/17106056
can someone help me?
Answers
Answer:
i believe b but check with other people
Explanation:
What is Avogadro's number?
0 23 X 106
O 2.06 X 1023
O 6.02 X 1023
O 2
Answers
Answer:
6.02 × 10^23 is his number
Tongue rolling is a dominant trait. Explain why it is possible for both parents being able to roll their tongue but their biological child is not able to do so.
Answers
Answer:
The answer is 0 ( AKA A )
Explanation:
Parents form the same type of gene, which is Rr. Since all the genes are the same, there can not be a chance that the offspring can not roll the tongue. Next time focus on your work!! :3
Consider the following two statements about succession.
Student 1:
Matthew - As succession begins, communities tend to be dominated by mostly K-selected species. As succession continues, r-selected species tend to compete better and therefore become more and more common.
Student 2:
Iman - As succession begins, communities tend to be dominated by mostly r-selected species. As succession continues, K-selected species tend to compete better and therefore become more and more common.
Which student is correct?
a. Provide a rationale for your answer (2 marks)
b. Provide a specific example of succession which includes at least one example of an r-selected and one example of a K-selected species. (1 mark)
Note - No marks are earned by simply agreeing with either Matthew or Iman
Answers
Select the correct answer from each drop-down menu.
humans and mice is almost 92% similar. This similarity indicates that
Mice have a tail, while humans have a tailbone. The tailbone is a
structure in humans.
Answers
homologous structure
Explanation:
similar physical features in organisms that share common ancestor
As depth increases in the Geosphere, so does_______
Answers
Answer:
temperature and pressure
Explanation:
i had a quiz on it
Answer:
Temperature and Pressure
Explanation:
:)
In DNA Adenine (A) bonds witha.Guanine (G) b.Thymine (T) c.Cytosine (C) d.Adenine (A)
Answers
the correct answer is the letter B. THYMINE
In DNA, these are the base pairs:
Adenine- Thymine
Guanine- Cytosine
The three main plant life processes are cellular respiration, photosynthesis, and transpiration. Drag each description to the correct process heading.
Answers
Respiration
• Converts food to usable energy
,• Releases carbon dioxide into the air
,• Uses oxygen
Photosynthesis
• Requires chlorophyll
,• Produces food for the plant
,• Uses carbon dioxide and water
,• Pulls water up from the roots to the leaves
Transpiration
• Important part of the water cycle
,• Returns water to the air
True or False: Once denatured, proteins can never be renatured or restored to their native status.
Answers
The statement "Once denatured, proteins can never be renatured or restored to their native status" is false.
Proteins are folded chains of Amino acid. Once denatured, proteins can be renatured or restored to their native status under certain conditions. Denaturation refers to the structural alteration of proteins, usually caused by factors like heat, pH changes, or chemicals. While denaturation disrupts the protein's original conformation and may lead to loss of function, it doesn't necessarily mean irreversibility. Proteins can regain their original structure and functionality through renaturation. This process involves providing suitable conditions, such as restoring the optimal pH, and temperature, or removing denaturing agents. The protein then has a chance to refold back into its original shape, recovering its functional biological activity.
There are different methods used to denature proteins like slowly decreasing the concentration of denaturants while simultaneously increasing the concentration of renaturing agents; using chaperone molecules or even refolding the proteins in a crowded environment.
#SPJ11
Learn more about denatured proteins: https://brainly.com/question/1303446
1. Explain using diagram how monomers are arranged in Thermoplastic and Thermosettingplastics.
Answers
Explanation:
In thermoplastics, the arrangement of monomeric units is linear and in thermosetting plastics, it is cross-linked. Thermoplastics are usually soft, weak and less brittle, so can get soften on heating and stiffen on cooling. They can be melted, remoulded and recycled easily.
