A microbiologist has a bacterial culture with 100,000 cells per mL of nutrient broth, but needs to dilute the culture with sterile nutrient broth to 1,000 cells/mL. To accomplish this, the microbiologist should dilute 1 mL of the culture to what total volume, in mL?
A. 10
B. 90
C. 100
D. 1, 000
PLEASE EXPLAIN ASAP
Answers
To accomplish the dilution the microbiologist should dilute 1 mL of the bacterial culture in 100 mL of the total volume. Thus, option C is correct.
What is dilution?Dilution is a process of decreasing the solute concentration by the addition of the solvent in the solution. The volume for the dilution is calculated as:
Given,
C1 = 100,000 cell per mL
C2 = 1000 cell per mL
V1 = 1 mL
C1 V1 = C2 V2
100,000 × (1 ÷ 1000)
= 100 mL
Therefore, 100 mL should be used to dilute 1 mL.
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Related Questions
The diffusion of water across a selectively permeable membrane is
homeostasis
homeostasis
endocytosis
endocytosis
osmosis
osmosis
passive transport
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Hope this helps
———is to animals cells as cellulose is to plant cel
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Answer:
lipids and protein is to animal cells as cellulose is to plant cell
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Pre-Test
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Which event signals the birth of a star?
A core shrinks and explodes in a supernova.
A protostar collapses, becoming dense and hot.
Extreme heat and pressure causes nuclear fusion.
A mass of gas and dust grows and forms a protostar.
Mark this and return
Answers
Hydrogen and helium atoms fuse together to generate stars. The heat produced by this process releases a lot of energy. Four hydrogen atoms and one helium atom are fused together in this procedure. Thus, the correct option is C.
What is helium?Hydrogen and helium atoms fuse together to generate stars. The heat produced by this process releases a lot of energy. Four hydrogen atoms and one helium atom are fused together in this procedure. The nuclear fusion processes are caused by the external heat, pressure, and gravitational force. The pressure produced by the heat allows the helium atom to fuse with carbon. These fusions are required to give the star its form.
The nuclear fusion processes are caused by the external heat, pressure, and gravitational force. The pressure produced by the heat allows the helium atom to fuse with carbon. These fusions are required to give the star its form.
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Mention four benefits of rearing the farm animal mentioned in a(i)..-
What is the most appropriate system of keeping the farm animal:....
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The four benefits of rearing the farm animal mentioned area the Good pleasant and amount of milk that may be produced and it could upload to the earnings of the farmer.
What types of animal systems are there?According to FAO, there are 3 predominant farm animal control systems: combined manufacturing. in-depth farming systems “landless” enormous manufacturing gadget.
A farming gadget is described as a complicated interrelated matrix of soil, plants , animals, implements, power, labor, capital and different inputs managed in component through farming households and encouraged to various stages through political, economic, institutional and social forces that perform at many levels (Dixon et al., 2001).Benefits of farm animals farming: 1) Good pleasant and amount of milk may be produced and it could upload to the earnings of the farmer. 2) Draught labor animals may be produced and utilized in agricultural work. 3) New range which can be proof against illnesses may be produced through crossing types with the preferred traits.Read more about the farm :
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What is the hypothesis? What educated guess are the scientists making?
Please help with this question about the beet root extract
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An assumption or concept is given as a hypothesis for the purpose of debating it and testing if it might be true.
What is a hypothesis in a scientific way?In the scientific process, the hypothesis is developed before any pertinent research—aside from a basic background review—has been conducted. You pose a question, research previous studies, and then formulate a hypothesis.
A hypothesis is typically a speculative assertion made solely with the intention of being tested.
In contrast, a theory is a principle that has been developed in an effort to explain phenomena that have previously been supported by evidence. It appears in the titles of several scientifically recognized principles, including big bang theory.
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What is the differences between mitosis and meiosis and explain why there is meiosis 1 and 2 in cell division but this is not happening with mitosis
Answers
Answer:
Explanation:
Cells divide and reproduce in two ways, mitosis and meiosis.
Mitosis results in two identical daughter cells, whereas meiosis results in four cells.
Keys differences and similarities between the two types of cell division.
Mitosis Meiosis
cells created: two daughter cells four daughter cells
Ploidy Creates diploid daughter cells Creates haploid daughter cells
Genetics Daughter cells are Daughter cells are . . genetically identical genetically different
Why is there a meiosis II but not mitosis II?
Meiosis II is generally regarded as being very similar to mitosis, except for the presence of two parent cells, instead of only one. In both meiosis I and II, cytokinesis occurs, and there are two daughter cells per parent cell.
Identify the correct statement(s) regarding heritability Heritability is always calculated by a correlation between parental (mid-parent) and offspring traits If heritability is equal to 1, offspring mean is equal to the mean of the original population When heritability is equal to 1, response to selection is equal to selection differential All of the above are correct
Answers
The correct statement regarding heritability is D. All of the above are correct.
What is heritability?Heritability simply means a measure of how well differences in the genes of people account for the difference in their traits.
In this case, a the options given regarding heritability are correct.
Therefore, the correct option is D.
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Please help!!! Thank you!!!!
Answers
Answer:
natural selection ; homologous
The population of birds with large beaks will increase on the island (1st listed) ; The trait for large beaks will be passed on to future generations through natural selection. (3rd listed)
B) 80 /200
Explanation:
Giraffes evolved over many generations to have long necks. Giraffes that had longer necks were more likely to survive than giraffes with shorter necks because they had better access to food. This is an example of natural selection / survival of the fittest.
(the "fittest" [most beneficial/practical] trait is surviving and getting "selected" by nature)
Giraffes are also vertebrates, like humans. In fact, despite their different neck sizes, humans and giraffes have exactly seven vertebrae bones in their neck. This similarity suggests human and giraffe necks are homologous [structures]
>>next image
...' What are two ways the decrease in seed availability will affect the population of birds on the island?'
The population of birds with large beaks will increase on the island.
[This is the concept of natural selection / survival of the fittest, they have the most abundant resource [because they are able to eat what is abundant on the island, compared to smaller birds that have a larger decrease in food availability] ]
The trait for large beaks will be passed on to future generations through natural selection.
[If these birds / and this trait survive, they will be able to have offspring [future generations]. Birds with a low survival percentage will be less successful in mating, and will likely not produce the same quantity of offspring that will carry on their traits to future generations.]
>>next image
frequency of an allele:
population: 100
frequency recessive [homozygous bc 2 same recessive alleles]: 25 (tt)
frequency dominant homozygous: 45 (TT)
frequency heterozygous dominant: 30 (Tt)
total alleles: 100 [our population] times 2
100 · 2 = 200
total alleles: 200
number of times we have [dominant] T:
30 from each heterozygous dominant (Tt)
2 · 45 (TT has two T's) = 90 from homozygous dominant
30 + 90 = 120
number of times we have [recessive] t :
30 from each heterozygous dominant (Tt)
2 · 25 (tt has two t's) = 50 from each homozygous recessive
30 + 50 = 80
So, we know that the frequency of recessive allele [t] is 80 / 200
[80 out of 200]
So, option B) 80 / 200 is correct
(this = 0.4)
(and dominant [T] is 120 / 200; I say this to show that recessive frequency and dominant frequency are calculated the same way!!)
(this = 0.6)
hope this helps!! (this took me a long time to write so please do read it thoroughly!!)
Answer:
your answer was so worth waiting!!!!!
Explanation:
Eukaryotic cells and their organelles are disrupted by sonication. A centrifuge is used to separate soluble and insoluble components. Protein X is found in the insoluble fraction following centrifugation. The insoluble fraction is treated with 0.5 M NaCl and centrifugation is repeated. Protein X is now found in the soluble fraction. Protein X would be best described as
Answers
Protein X would be best described as a peripheral membrane protein.
What is eukaryotic cells?It should be noted that eukaryotic cells are cells that have a clearly defined nucleus.
In this case, Protein X would be best described as a peripheral membrane protein. This because they associate through hydrophobic interaction.
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Rainforests are not exclusively found near the equator.
Please select the best answer from the choices provided
T
Or
F
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Which of the following is NOT a benefit of the process of Photosynthesis evolving on Earth?
A. Increase in atmospheric O2
B. Filtering of UV light
C. Reduction of atmospheric CO2
D. Increase in atmospheric Nitrogen
abc or d with a simple rundown
Answers
Answer:
I think the answer is C. Reduction of atmospheric CO2
Explanation:
I hope this helps! Correct me if I am wrong.
a team of scientists has consistently gotten the same unexpected results from a set of experiments.Which of the following helps the scientist ensure the reliability of the results?
a. publican of the results, including a brief description of the scientific methods
b. discussion of the scientific method with friends and family
c. peer review of the scientific methods and data analysis
d. Removal of any data that are not consistent with the other results
Answers
Peer review of the scientific methods and data analysis will ensure reliability of the results.
What is Reliability?This involves a scientist getting the same results under the same type of conditions in this scenario.
Peer review involves the experiment being done by other scientists to ascertain if the data gotten are reproducible which will determine its reliability and accuracy.
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What embyonic germ layer gives rise to muscle?
Answers
The mesoderm is one of the embryonic layers together with the ectoderm and endoderm. The germ layer that gives rise to muscle is the mesoderm.
What is the mesoderm?Three embryonic layers are present in the blastoderm after segmentation. One of them is the mesoderm, which is located between the ectoderm and the endoderm.
Different tissues and cells are formed from the mesoderm, such as muscular, skeletal, circulatory, and connective tissues.
The correct anwer is mesoderm. The embyonic germ layer that gives rise to muscle is the mesoderm.
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What controls differentiation? Choose the correct answer .
Answers
Gene expression controls differentiation of cells. Details about differentiation can be found below.
What is cell differentiation?Cell differentiation is a cellular process in which the cells of multicellular organisms advance in organization and acquire special organs for specific purposes.
Cell differentiation is what forms specific cells that are adapted to specific roles in multicellular organisms.
However, this process of differentiation is as a result of the expression of genes at different times, since, all cells of an organism contains the same genes.
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Dihybrid crosses Black coat color is dominant over white coat color in guinea pigs. in addition to coat color, rough coat is dominant over smooth coat. a. in a punnett square, demonstrate a cross between a homozygous black/homozygous rough with homozygous white/homozygous smooth. Describe the genotype and phenotype as fractions
Answers
an individual's set of observable characteristics that results from the interaction of a genotype with the environment
check me if I'm rong
Glucose provides energy for cells. Different cells have different mechanisms for glucose intake. Intestinal cells contain proteins that transport glucose against its concentration gradient. These proteins couple the movement of glucose to the movement of sodium down its concentration gradient. Red blood cells have transporter proteins embedded in their membranes. When bound by a glucose molecule, these proteins change shape and allow glucose to move down its concentration gradient into the cell.
Based on this information, what type of transport is used for glucose in blood and intestinal cells?
A.
Both blood and intestinal cells take in glucose by passive transport.
B.
Blood cells take in glucose by active transport and intestinal cells take in glucose by passive transport.
C.
Blood cells take in glucose by passive transport and intestinal cells take in glucose by active transport.
D.
Both blood and intestinal cells take in glucose by active transport.
Answers
Both blood and intestinal cells take in glucose by passive transport. Thus, the correct option is B.
What is facilitated diffusion?A transport protein found in the plasma membrane facilitates diffusion, which is the passive movement of things like biological molecules or ions across a plasma membrane. Chemical energy is neither utilized nor required because compounds are moved from higher to lower concentrations.
Glucose is absorbed by the mechanisms of facilitated diffusion or passive transport across the membrane of red blood cells. The sugar glucose is transferred by active transport from the gut into intestinal epithelial cells.
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Which is the result of a seasonal change?
A. Trees dying from air pollution
B. A bear hibernating
C. A bat capturing mosquitoes
D. Average temperatures rising each year
Answers
Answer:
B. A bear hibernating
Explanation:
The other options are not specific to seasons, but bears consistently hibernate annually in the winter.
Which statement describes the work of Aristotle and Linnaeus?
Aristotle’s classification system had many levels, while Linnaeus’s classification system only had two levels.
Aristotle’s and Linnaeus’s classification systems both divided all life into two groups: plant and animal.
Linnaeus proved that many organisms, which were classified as plants by Aristotle, were animals.
Aristotle and Linnaeus worked side by side examining organisms on many trips.
Answers
The correct description is:
Aristotle’s and Linnaeus’s classification systems both divided all life into two groups: plant and animal: option B.
What was the work of Aristotle and Linnaeus centered on?Aristotle was a Greek philosopher who studied life and living things to be able to explain their behavior.
Linnaeus was a Biologist who studied and classified living things into plants and animals.
Aristotle and Linnaeus both classified living things into plants and animals.
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which statement about the elongation phase of protein synthesis is true?
Answers
The statement that is true about elongation phase of protein synthesis is that Peptidyl transferase is a ribozyme.
What is Protein synthesis?Protein synthesis is defined as the process biological systems use to produce new molecules of proteins.
Peptidyl transferase is a type of enzyme called ribozyme which is responsible for peptide bond formation during protein synthesis.
Therefore, the statement that is true about elongation phase of protein synthesis is that Peptidyl transferase is a ribozyme.
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A blood alcohol concentration of. 08 indicates that _____ percent of your blood is alcohol.
Answers
A blood alcohol concentration of. 08 indicates that 0.08% of your blood is alcohol.
Any driver who's stopped by a law enforcement officer and found to have a breath or blood alcohol level of .08 or higher will, at the time of the arrest?Any driver who's stopped by a law enforcement officer and found to have a breath or blood alcohol level of .08 or higher will, at the time of the arrest will have their driving privilege suspended. Depending on what occurs, the suspension will change from shorter to longer, and vice versa.
Thus, 0.08% of your blood is alcohol.
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One way in which photosynthesis would be affected if all the air spaces in the leaf were filled with cells
Answers
Carbon dioxide must flow from the air spaces into the leaf for photosynthesis to take place. By diffusing via tiny pores called stomata, it achieves this.
How gaseous exchange is affected if cells are filled in the air spaces.
Cells called stomata are found on the epidermis, or skin, of an above-ground plant. These cells allow water and oxygen to enter the plant while also allowing carbon dioxide to depart. The process through which plants absorb carbon dioxide and exhale oxygen as waste is known as photosynthesis. Intake of carbon dioxide reacts with water in the presence of sunlight to produce glucose and other molecules that are high in energy.If, air spaces are filled with the cells no exchange of gases takes place which does not allow plants to produce energy-rich compound glucose.To learn more about the photosynthesis, you can refer to-
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Phosphofructokinase is an enzyme that acts on fructose 6-
phosphate at an early step in glucose breakdown. Regulation of this enzyme controls
whether the sugar will continue on in the glycolytic pathway. Considering this graph,
under which condition is phosphofructokinase more active? Given what you know about
glycolysis and regulation of metabolism by this enzyme, explain the mechanism by which
phosphofructokinase activity differs depending on ATP concentration. Explain why it
makes sense that regulation of this enzyme has evolved so that it works this way.
Answers
A/An ____________________ reaction involves binding antigens to antibodies.
Answers
Answer:
its "A" reaction involves binding antigens to antibodiess
Explanation:
it is because An only comes before a vovle word
An immune reaction involves binding antigens to antibodies.
What is an immune reaction?An immune reaction is a type of reaction that take place in the immune system if the body which involve binding of antigens to the antibodies to prevent foreign invaders.
Therefore, An immune reaction involves binding antigens to antibodies.
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Is the activity of altering the existing business processes and desgining new ones to take advantage of new information systems
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Business process management can be described as the activity of altering the existing business processes and desgining new ones to take advantage of new information systems.
What is Business process management?Business process management is the process of resigning new business process as well as modifying existing processes in order to leverage new information systems available for businesses.
Therefore, business process management can be described as the activity of altering the existing business processes and desgining new ones to take advantage of new information systems.
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Thapsigargin is a potent calcium atpase pump inhibitors. What state of the myogram would be affected immediately?
Answers
The fact that Thapsigargin is a potent calcium atpase pump inhibitor means that the phase that will see immediate effects is the Relaxation period.
Why does the Relaxation period get immediately affected?Calcium ATPase pumps help the muscles to relax after contraction which means that Thapsigargin prevents this from happening.
It's effect will therefore be immediately felt in the relaxation period as muscles will be unable to relax.
Options for this question are:
a. Latent period
b. Contraction period
c. Relaxation period
d. All myogram stages are affected
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How does the intracellular fluid compartment differ from the extracellular fluid compartment?.
Answers
You pick up a vertebra to identify it and note that the transverse processes contain foramina. This unique feature identifies the vertebra as coming from the ________ region of the vertebral column.
Answers
The foramina is a unique feature that identifies a vertebra as coming from the cervical region of the vertebral column.
What is a vertebra?The vertebra refers to a collection of bones which gives structure and shape to vertebrate animals.
The vertebra is also known as the backbone.
The vertebra in divided into various types based on the region they are found in the body.
The transverse process of a vertebra containing foramina is from the cervical region as they provide passage to the vertebral artery.
Therefore, the foramina is a unique feature that identifies a vertebra as coming from the cervical region of the vertebral column.
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to aThe development of the cell theory is directly related to advances in microscope technology why are these two related?
Answers
The study of the cell theory required the use of more sophisticated microscopes hence development of the cell theory is directly related to advances in microscope technology.
What is cell theory?The cell theory portrays the idea that a cell is the smallest unit of an organism. Cells are so small that they can nit be seen with the ordinary optical eyes. As such, the eyes must be aided by a device such as a microscope to make the study of the cells possible.
From the time of Robert Hooke when the cell theory began to take more shape, the complex microscope was discovered. As time went on, the cell theory was advanced and more sophisticated microscopes had to be produced.
Thus, development of the cell theory is directly related to advances in microscope technology.
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Science question! help…….
Answers
Original Question: Some plants have red leaves instead of green leaves. Which of the statement about the production of food through photosynthesis in such plants is most likely true?
Answer: (J) The chlorophyll necessary for photosynthesis is present but hidden by red pigment.
Explanation: Every plant has chlorophyll to help with the production of food through photosynthesis.
For plants with red leaves or any other color but green, the pigment simply acts as a 'sunscreen to the plant', who perhaps doesn't require so much sunlight in its photosynthesis.
Hope that helps!
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importance of potassium in plants (any 4 points)
Answers
1. Increases root growth and improves drought tolerance.
2. Builds cellulose and reduces lodging.
3. Activates at least 60 enzymes involved in growth.
4. Helps translocate sugars and starches.
5. Produces grains rich in starch.
6.Increases protein content of plants.
