Question

the idea that viruses originated as genetic material that was able to move within a genome, eventually exiting a cell and entering another is the ______ hypothesis.
a) recessive
b) regressive
c) progressive
d) coevolution
question 12 (5 points)
listen
cells have receptors on their surfaces to sense their environment and to communicate with other cells. viruses use these cell receptors to
a) cause the cell to disintegrate, or lyse.
b) enter the cell.
c) insert their genetic material into the cellular genetic material.

Explanation:

First Question (about virus origin hypothesis)

The progressive (or escape) hypothesis of virus origin states that viruses originated from genetic material (like transposons) that gained the ability to move between cells. Recessive relates to genetics (trait expression), regressive hypothesis suggests viruses came from more complex organisms losing functions, and coevolution is about species evolving together. So the progressive hypothesis matches the description.

Question 12 (about viruses and cell receptors)

Cell receptors are used by viruses as attachment sites to bind to the cell, which is the first step for the virus to enter the cell. Lysing (option A) is a later step in some viral cycles, and inserting genetic material (option C) happens after entry. So viruses use receptors to enter the cell.

Answer:

C) progressive