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Minchanka [31]
3 years ago
6

A common way by which virus vaccines are made is to introduce a mutation that makes the virus less virulent (i.e. that reduces t

he severity of infection) and to expose patients to that mutated virus. which sort of mutation would it be safest to introduce to ensure that the virus cannot easily revert to its original, virulent state?
Biology
1 answer:
vladimir1956 [14]3 years ago
7 0
Answer: deletions

It's safer to cause a mutation by deleting the genetic information responsible for the virulence of the virus. This method is used in attenuated vaccines, where the virus is still alive but less virulent. These types of vaccines cannot be used by immunocompromised individuals.
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What event in history led to the the dark-colored peppered moth being better able to survive than the lighter-colored variety? A
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The pollution from the Industrial Revolution darkening the trees. After the trees darkened from all the soot in the air, the white moths were easier to see and more vulnerable to predators. The dark moths blended into the dark tree bark.
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3 years ago
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What is the term for a condition whereby small amounts of urine leak from a bladder that is always full as a result of a spinal
grigory [225]

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Overflow incontinence

Explanation:

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3 years ago
Name two threats to biodiversity:
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I really hope this helps!


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6 0
3 years ago
Part A: If one follows 70 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes wou
olga nikolaevna [1]

Answer:

<u>Part A</u> : 70 secondary oocytes will be formed.

<u>Part B</u> : 70 first polar bodies will be formed.

<u>Part C</u> : 70 ootids will be formed.

Explanation:

During oogenesis growth maturation of a single oogonium produces one primary oogonium.

the primary oogonium then undergoes meiosis -1 and produces  one secondary oocyte and first polar body.

The secondary oocyte then undergoes meiosis - 2 and forms an ootid and second polar body.

The ootid then differentiates into the ovum.

As in the above scenario , 70 primary oocytes are present , they undergo meiosis-1 and produces 70 secondary oocytes and 70 first polar bodies. Hence answers of part A and B is 70.

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8 0
3 years ago
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vovangra [49]

Answer:

The presence of fecal coliform in aquatic environments may indicate that the water has been contaminated with the fecal material of humans or other animals. Fecal coliform bacteria can enter rivers through direct discharge of waste from mammals and birds, from agricultural and storm runoff, and from human sewage.

Explanation:

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