Viruses are often isolated from cells by filtration based upon the fact that they ______.
a)form large aggregates that do not pass through the filter
b) make the host cell sticky so it will bind to the filter and not pass through it
c) bind to the filter, while cells pass through it
d) are smaller than the pore size of the filter, so they pass through it
Answers
Form large aggregates that do not pass through the filter.
How can isolated from cells by filtration from the Viruse?By filtration or centrifugation, virions in a liquid medium can be isolated from the host cells. Everything physically present in the solution that is larger than the virions can be physically removed by filters, and the viruses can then be gathered in the filtrate.
A frequent method for separating viruses from cell waste and other tiny compounds is centrifugation. Viral particles are left in the supernatant after cells and big cell debris are removed by low-speed centrifugation (5000 g). By centrifuging at faster rates, virus can be further purified and concentrated.
Membranous screens with tiny pores are used in filtration to let liquids pass through while blocking larger particles like germs from doing the same.
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Related Questions
For an enzyme that displays michaelis-menten kinetics, what is the effect on km of doubling the concentration of substrate?.
Answers
For an enzyme that displays michaelis-menten kinetics will show no effect on km by doubling the concentration of substrate.
What is michaelis-menten kinetics?Michaelis-Menten kinetics is a model of enzyme kinetics that describes how the rate of an enzyme-catalyzed reaction depends on the concentration of an enzyme and its substrate.
There are three assumptions in Michaelis-Menten kinetics.
Steady state approximationFree ligand approximationFast equilibrium approximation.For practical reasons, Km is the substrate concentration that allows the enzyme to reach half its Vmax. An enzyme with a high Km has a low affinity for its substrate and requires a higher concentration of substrate to reach its Vmax.
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Most of earth's atoms came from...
A.An exploding massive star
B.Other planets that have been destroyed
C.The ground and sky
Answers
Answer:
I believe it's C
Explanation:
During meiosis, non-sister chromatids may exchange sections of dna leading to genetic diversity. What is this process called?.
Answers
During meiosis, the exchange of sections of DNA between non-sister chromatids, leading to genetic diversity, is called crossing-over.
During the pachytene stage of prophase 1 of meiosis, chiasma is formed between the non-sister chromatids of homologous chromosomes. Through this intersection, the exchange of genetic material i.e., DNA takes between the bivalent chromatids.
Only two out of the four chromatids participate in this process. This gives rise to two recombinant chromosomes, which have unique gene sequences, and two parental chromosomes, which have the same genetic sequences as the parent. Hence, genetic diversity can be seen in the progeny because of the formation of new gene combinations.
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What is an atom’s atomic number? the number of electrons in an atom the number of neutrons in an atom the number of protons in an atom the number of bonds in an atom
Answers
Answer:the number of electrons in an atom the number of neutrons in an atom the number of protons in an atom the number of bonds in an atom
Explanation:
Answer:
the number of protons in an atom
Explanation:
edge2020
The autoclave holds and consistently for long enough to kill all microorganisms and spore on items with the chamber.
Answers
Autoclave is a steam sterilizing machine. They are used in health care, food industries, and laboratory applications. The autoclave machine is cylindrical in shape. The working principle of autoclave is the use of steam to kill microorganisms by pressure.
The microorganism that can be killed in the autoclave is bacteria, viruses, and fungi whereas spores of bacteria and fungi can survive in the autoclave. The temperature at which the autoclave works is 121 degrees C. The complete working duration of the autoclave is 121 degrees C for 15 minutes.
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10. Are the other phases of mitosis equal (or close)? Suggest a reason for any differences in the timing of mitosis phases.
Answers
The other phases of mitosis are not equal in duration. The time spent in each phase can vary depending on the cell type, the stage of development, and other factors.
Explanation:
For example, the duration of prophase can vary widely depending on the complexity of the chromosome structure, the degree of chromatin condensation, and the presence of any DNA damage or repair mechanisms. Metaphase is usually a relatively brief phase, lasting only a few minutes, as the spindle fibers align the chromosomes at the equatorial plate. Anaphase, on the other hand, can be relatively long, as the sister chromatids are separated and pulled towards opposite poles of the cell. Telophase is generally shorter than prophase or anaphase, as the spindle apparatus disassembles and the nuclear envelope reforms.
The timing of mitotic phases can be influenced by various factors, including the nature of the signal that triggers cell division, the availability of nutrients and growth factors, and the presence of DNA damage or other cellular stresses. Additionally, the rate of mitosis can vary depending on the cell type and the developmental stage, with rapidly dividing cells such as embryonic cells and cancer cells typically exhibiting shorter cell cycles than non-dividing cells.
What hormone helps regulate sugar in the blood?
thyroxin
thymus
adrenaline
insulin
Answers
Answer:
Insulin and glucagon
Explanation:
The human body wants blood glucose (blood sugar) maintained in a very narrow range. Insulin and glucagon are the hormones that make this happen. Both insulin and glucagon are secreted from the pancreas, and thus are referred to as pancreatic endocrine hormones.
Answer:
The answer is insulin!
Explanation:
Hope this helps:)
All nine essential amino acids can be found in meat. By employing the nutritional principle of complementarity, a vegetarian gets all nine. What is complementarity
Answers
Answer:
All 9 essential amino acids can be found in meat. By employing the nutritional principle of complementarity, a vegetarian gets all nine. What is complementarity? Combining foods that complement each others essential amino acids.
Explanation:
I hope this helps!
whats the diffrnece between MRNA and ATP
Answers
Answer:
MRNA is transfer the information from DNA to the cell machinery that makes proteins.
ATP is the main energy currency in the cells
Explanation:
hopep this helps a little im not the best a biology
In which stage of the cell cycle does replication occur? *
Prophase
Cytokinesis
Metaphase
Interphase
Answers
Explanation:
you need to put the pic down too
What is the measuring unit for any given element?
Answers
Answer:
The mass of atoms and subatomic particles is measured using atomic mass units (abbreviated amu); protons and neutrons have a mass of one amu, and the mass of an electron is negligible. ... The atomic mass of an element is the weighted average of the masses each of these isotopes
Explanation:
Hope this helps
Have a great day
Happy hoildays
~Zero~
Answer:
If it's related to chemistry it's measured in atomic mass unit or simply amu.
What is incised to cut out renal cell carcinoma?
Answers
The surgical removal of renal cell carcinoma usually entails a nephrectomy, which is the surgical removal of the kidney containing the cancerous tumour.
A partial nephrectomy, which involves removing only the tumour and a portion of the kidney tissue surrounding it, may be possible depending on the size and location of the tumour.
An incision in the abdomen or flank is made to gain access to the kidney during a nephrectomy.
To isolate the kidney from the surrounding structures, the surgeon carefully dissects the tissues and blood vessels surrounding it.
To prevent urine from leaking during the procedure, the ureter, which is the tube that transports urine from the kidney to the bladder, is identified and clamped.
Thus, the answer is nephrectomy.
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Which formation is the result of glacial erosion?
Answers
Which of the following is a main function of the circulatory system?
A.
To break down nutrients into a simpler form
B.
To transport oxygen to tissues throughout the body
C.
To send signals to the nervous system
D.
To produce hormones for reproduction
Answers
B. transport oxygen to tissues
6.
Which statement best describes the DNA molecules made from this process?
The new DNA molecules are identical to each other and to the original molecule.
The new DNA molecules are identical to each other but not to the original molecule.
The new DNA molecules are each identical to only one strand in the original molecule.
The new DNA molecules are not identical to the original, providing variation in the DNA.
Answers
Answer:
The new DNA molecules are identical to each other and to the original molecule.
Explanation:
The new DNA molecules are identical to each other and to the original molecule. Thus option 1 is correct.
What are DNA molecules?DNA stands for deoxyribonucleic acid.
DNA is defined as the molecule that conveys genetic information for an organism's development and function.
DNA is made up of two connected strands that spiral around each other to form a twisted ladder-like structure known as a double helix.
DNA is made up of molecules called as nucleotide.
Nucleotide are made up of three types of molecules.
The phosphate groupThe sugar moleculeThe nitrogen baseThus, the new DNA molecules are identical to each other and to the original molecule. Thus option 1 is correct.
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Two or more pesticides that cannot be effectively mixed together are said to be________?
Answers
Two or more pesticides that cannot be effectively mixed together are said to be incompatible.
Incompatibility occurs when the mixture of different pesticide products results in reduced efficacy, changes in physical properties, or causes damage to the treated surfaces or plants. It's important to check product labels and perform compatibility tests before mixing multiple pesticides to ensure their effectiveness and safety.
Incompatibility can also lead to safety risks for the applicator or bystanders. Mixing certain pesticides can result in the release of harmful gases or vapors that can cause respiratory irritation, headaches, nausea, or even more serious health effects.
Additionally, incompatible mixtures can increase the risk of equipment failure, such as clogged nozzles or damaged tanks, which can result in uneven or incomplete application of pesticides.
Therefore, it is crucial to carefully read and follow product labels, and to always wear appropriate personal protective equipment when handling pesticides to minimize the risk of exposure to potentially harmful chemicals.
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Look at page 2 of the Article. What makes some plants more sustainable? Drag four correct
answers into the box.
Answers
PLEASE HELP I HAVE BEEN TRYING TO FIGURE THIS OUT A certain plant can have two flower color options: yellow or orange. A geneticist is looking to create a true-breeding yellow folowered plant. When he self pollinates the plant he believes to be true-breeding it results in 50% yellow folwered offspring and 50% orange flowered offspring. Do these results support or refute his belief that his plant is true breeding? Why or why not?
Answers
True-breeding plants are those that produce offspring with the same traits as the parent plant when they self-pollinate or are cross-pollinated with another true-breeding plant with the same traits. If the geneticist's yellow flowered plant was true-breeding, all of its offspring should also have yellow flowers.
However, the geneticist's self-pollination experiment resulted in offspring with both yellow and orange flowers, indicating that the yellow flowered parent plant was not true-breeding. If the parent plant was heterozygous for flower color (i.e. carried one dominant and one recessive allele), the observed 1:1 ratio of yellow and orange flowered offspring would be expected. This suggests that the parent plant was not true-breeding and instead carried a dominant allele for yellow flowers and a recessive allele for orange flowers.
Therefore, the results of the experiment refute the geneticist's belief that his plant is true-breeding, and suggest that the plant is heterozygous for flower color.
mi lei is pregnant and her body is currently experiencing the event that triggers hormonal changes that will prevent further menstruation. this event is called
Answers
Mi lei is expecting, and her body was currently going through the process that causes hormonal changes which will stop additional periods from occurring.This occurrence is known as implantation.
What are the initial implantation symptoms?Some women do have symptoms and telltale evidence of implantation.Light bleeding, cramps, nausea, bloating, painful breasts, headaches, mood changes, and potentially a change in core body temp are some of the symptoms that may be present.
How long after fertilization does implantation happen?Implantation.About five to six days following fertilization, when the egg reaches the blastocyst, it emerges from the zona pellucida and starts the process or implant in the uterus.
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how much atp would be synthesized by the complete beta-oxidation of a fatty acid chain with 16 carbon atoms?
Answers
The complete beta-oxidation of a fatty acid chain with 16 carbon atoms would produce 129 molecules of ATP.
To explain in more detail, beta-oxidation is the process by which fatty acids are broken down in order to produce energy in the form of ATP. During this process, the fatty acid chain is sequentially broken down into acetyl-CoA molecules, which then enter the citric acid cycle and electron transport chain to produce ATP.
For a fatty acid chain with 16 carbon atoms, the process of beta-oxidation would yield 8 acetyl-CoA molecules. Each acetyl-CoA molecule can then go through the citric acid cycle and electron transport chain to produce 17 molecules of ATP, resulting in a total of 136 ATP molecules. However, two ATP molecules are required to initiate the beta-oxidation process, so the net yield of ATP from the complete beta-oxidation of a 16-carbon fatty acid chain would be 129 molecules.
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Choose the two most important reasons for the different seasons on Earth.
Answers
Answer:
the distance between sun and earth and earth position.
Explanation:
Use Meteorology in a Sentence science related answers only please
Answers
Meteorology is the science of the weather. The weather person on the TV is a meteorologist.
Some of them quite liked meteorology, but others only tolerated it as it is not an exact science
Using the words "selection pressure" and "fitness", explain how natural selection causes populations to change over time.
Answers
Answer:
Environment and competition is the leading cause of evolution. It's an instinct to want to live, but trying to survive is difficult when other animals have the same goal. An ecosystem is a cycle, but every generation of this ecosystem slightly changes, and so do the animals. Every bug that has fitness can start overpopulating the ecosystem, leading to a surge of resources for what preys on the bug. Now bird's population goes up, so do other animal populations. Or the bug becomes an invasive species, and birds are being hunted too often to decrease the population.
In a different scenario, bugs are evolving because of the selection pressure that the environment is giving them. The birds have become better over the generation, and now have a more suited beak to catch the bug off the ground. The bug population maybe be decreasing, but the ones who live through the crisis are populating with bugs that certain gene that helped them out. But it's not over, the bug population isn't declining but it wasn't as big as it was before. The bird will find more ways to find and capture the bugs. But then bugs will keep surviving through the selection pressure and become much harder to find since they figured out camouflage. The bug that was neon yellow was dying since they were easy to see. Now they can range from green to black to hide in the environment. Now the birds are facing the selection pressure, it's a cycle.
(look, im not good at gammar, so you should get this looked at before entering it. I put it through gammarly if that helps.
What the weakness of DNA Extraction??
Please help me
Thank you
Answers
Answer:
the weakness potential is for invasion of individual privacy.
Explanation:
Because a person's DNA reveals so much information about their physical state, it is sensitive information that must be carefully guarded.
sort the scenarios according to whether the mutations would spread by natural selection, neutral evolution, or both.
Answers
Natural selection: A change in the amino acid sequence of a protein results from a mutation in a gene that codes for it. And. A pseudogene mutation affects a protein's rate of transcription.
Neutral evolution: A mutation in a protein-coding gene does not alter the amino acid sequence of a protein, and a mutation in a pseudogene has no downstream effects. Both: A population develops a fixed mutation in a protein-coding gene.
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Which letter in the diagram below represents the location where oxygenated
blood is pumped into the heart?
OA. B
OB. A
OC. C
OD. D
Answers
List the 3 phases of the cell cycle in order. 20 pts
Answers
Answer:
The cell cycle is composed of
interphase (G₁, S, and G₂ phases)
phase (mitosis and cytokinesis)
G₀ phase
Explanation:
:)
in general, , the smallest arteries, have less than six layers of smooth muscle in their tunica media.
Answers
The smallest arteries, also known as arterioles, can have varying numbers of layers of smooth muscle in their tunica media depending on their location and function. This statement is false.
Arterioles in different tissues and organs have different levels of vascular resistance and thus require different amounts of smooth muscle for their regulation.
For example, arterioles in skeletal muscle have relatively fewer layers of smooth muscle (2-3 layers) compared to those in the skin or kidneys, which have more layers (up to 7-8 layers). This is because skeletal muscle requires a greater blood flow during physical activity, while the skin and kidneys require more precise regulation of blood flow for thermoregulation and filtration, respectively.
Therefore, the number of smooth muscle layers in arterioles is not a fixed value, but rather a variable that depends on the specific tissue or organ being considered.
Complete question:
in general, the smallest arteries, have less than six layers of smooth muscle in their tunica media. True or false.
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how do scientists provide solutions for many of the worlds problems?
A. through the use of politics
B. by having more conferences
C. through the use of technology
Answers
Answer:
C. Through the use of technology
Explanation:
hope this helps :)
Select all that apply.
The major contributions of Maury included:
fishery science
mapping the ocean bottom
oceanic chemistry
investigation of ocean currents
experiments with plankton
observation of ocean winds
Answers
Answer:
Fishery science
mapping the ocean bootom and oceanic chemistry .
Explanation:
Maury full name was Matthew Frontain Maury.his majar contribution is of similr field like marian biology with minor in geology .