Question

question 7
viruses can progress to two possible scenarios after infecting the host cell. which of the following is characteristic of the lysogenic cycle?

o a viral dna takes over the host cell, making new viruses that burst out of the cell.
o b viral rna takes over the host cell, making new host cells.
o c viral dna is inserted into host dna, and is replicated when the cell divides.
o d viruses enter the host cell, and rapidly make copies of the host dna

question 8
some components of cells are listed.

1. cytoplasm
2. nucleus
3. chloroplasts
4. cell wall
5. cell membrane

which of the components could be observed using a microscope in a prepared slide of leaf epidermal cells, but not in a prepared slide of human cheek cells?

o a components 1 and 5 only
o b components 3 and 4 only
o c components 2 and 3 only
o d components 1, 2, and 3 only

Explanation:

Question 7

In the lysogenic cycle, viral DNA integrates into the host DNA (becomes a prophage) and replicates along with the host cell's DNA when the cell divides. Option a describes the lytic cycle. Option b is incorrect as it mentions RNA (viruses in lysogenic cycle can have DNA - like bacteriophages). Option d is also incorrect as viruses do not copy host DNA in the lysogenic cycle.

Plant cells (leaf epidermal cells) have cell walls (for structure) and chloroplasts (for photosynthesis in some plant cells - epidermal cells may have chloroplasts in some cases, and all plant cells have cell walls). Animal cells (human cheek cells) do not have cell walls or chloroplasts. Both plant and animal cells have cytoplasm (1), nucleus (2), and cell membrane (5).

Answer:

C. Viral DNA is inserted into host DNA, and is replicated when the cell divides.

Question 8