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Roman55 [17]
3 years ago
8

Which of the following is true regarding cultivation and isolation of animal viruses? A. Mouse models are available for virtuall

y all human viral infections and can be routinely used for vaccine development. B. Viruses can be easily grown in liquid culture without any other organisms present. C. The preferred and widely used method of viral isolation and growth is via growth in an embryonated egg. D. Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host.
Biology
1 answer:
lesya692 [45]3 years ago
7 0

Answer: D.

Explanation:

Viruses can be cultivated within appropriate hosts, such as a living cell . For example, bacteria are grown in an acceptable growth medium to research bacteriophages; then bacteriophagi are added. Within the bacteria, the bacteriophages replicate and greatly increase their numbers.

Diploid cell lines (or strains) are subcultured approximately 100 times before death. A lot more useful in the laboratory and they can be kept in liquid nitrogen forever. The human embryonic fibroblasts are one example of this kind.

As diploid cell line, developed from human embryos have more accurate results and can be stored for longer period of time, they are widely used in cultivation and isolation of viruses that require human hosts.

Hence, the correct option is D.

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________ are high latitude soils containing permafrost and large amounts of organic matter.
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Gelisols are high latitude soils containing permafrost and large amounts of organic matter. ]
Gelisols are soils that are permanently frozen or contain evidence of permafrost near the soil surface. They are found in the Arctic and Antarctic, as well as at extremely high elevations. Additionally they are also found at extremely high elevations in the lower latitudes. 
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3 years ago
Help help help please
elena-s [515]

My guess would be D.. Not for sure tho.

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The Na⁺/Ca²⁺ exchanger, which couples the movement of Na⁺ down its electrochemical gradient with the movement of Ca²⁺ against it
ludmilkaskok [199]

Answer:

The Na⁺/Ca²⁺ exchanger, which couples the movement of Na⁺ down its electrochemical gradient with the movement of Ca²⁺ against its electrochemical gradient, is a(n) <u>symporter secondary active transport </u>because Ca²⁺ and Na⁺ move in different directions across the membrane.

Explanation:

The Na⁺/Ca²⁺ exchanger is a secondary active transport because it uses the energy of the Na⁺ that moves in favor of its electrochemical gradient to bring a Ca²⁺ ion against its electrochemical gradient inside the cell. This transport needs the help of a  symporter, which is a protein that moves two different ions in the same direction.

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3 years ago
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All of the following affect metabolism except:
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<span>None of the above. All of the following affect metabolism at some point in an individual's life. As a person ages, metabolic rate generally slows down because of muscle tissue loss, and some hormonal and neurological changes. Gender also affects metabolism because men are generally larger in size than women that is why they tend to have faster metabolisms than women. Genes or inherited traits from parents also affect metabolism, the rate at which the body goes is dependent on inherited traits from parents, also the diseases that come with abnormal genes can affect metabolism. Temperature can also affect metabolism because the body adjusts to maintain its normal temperature which can either increase or decrease metabolic rate.</span>
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3 years ago
Place these developmental milestones in the correct order. (1 being the first milestone to happen) baby is born different cell l
GenaCL600 [577]

Answer:

The correct order in which development occurs from fertilization of the egg is:

  1. <em>Sperm fertilizes egg .</em>
  2. <em>Cell divides. </em>
  3. <em>Implants size and weight increase greatly. </em>
  4. <em>Different cell layers form .</em>
  5. <em>Organs and limbs form embryo. </em>
  6. <em>Heartbeat/movements detected .</em>
  7. <em>Movements strengthened .</em>
  8. <em>Organ systems mature .</em>
  9. <em>Baby is born. </em>

Explanation:

  1. <u>Sperm fertilizes egg</u>: it is the process called fertilization, which consists of the union of the paternal gametes to originate the zygote.
  2. <u>Cell divides</u>: Once the zygote has formed, it undergoes successive divisions by mitosis, to originate the different structures.
  3. <u>Implants size and weight increase greatly</u>: successive divisions cause the implanted zygote to progressively increase in size.
  4. <u>Different cell layers form</u>: consists of the formation of the embryonic layers -<u>ectoderm, mesoderm and endoderm-</u> from which the tissues and organs of the embryo will be formed.
  5. <u>Organs and limbs form embryo</u>: from the three embryonic leaves the different apparatuses and sisythems of the embryo are formed.
  6. <u>Heartbeat / movements detected</u>: Initiates the function of organs such as the heart and extremities.
  7. <u>Movements strengthened</u>: movements in the embryo are more continuous and defined.
  8. <u>Organ systems mature</u>: the nervous, cardiovascular, digestive and respiratory systems, among others, are suitable for birth.
  9. <u>Baby is born</u>.

When the baby is able to survive outside the womb, birth occurs.

Learn more:

Development of the offspring brainly.com/question/465851

7 0
3 years ago
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