Question

what is the purpose of antibiotic resistance segments within a plasmid?
a the antibiotic resistance segments ensure only plasmids with the bacteria will grow.
b the antibiotic resistance segments ensure only plasmids with the insulin will grow.
c the antibiotic resistance segments ensure only bacteria with insulin will grow.
d the antibiotic resistance segments ensure only bacteria with the plasmid will grow.

Explanation:

To determine the correct answer, we analyze each option:

• Option a: Incorrect. Antibiotic resistance segments don’t ensure “plasmids with bacteria” grow (plasmids are in bacteria, and the logic is flawed).
• Option b: Incorrect. Antibiotic resistance is not related to ensuring plasmids with insulin grow (insulin is a product, not the target of antibiotic selection).
• Option c: Incorrect. Antibiotic resistance segments don’t select for bacteria with insulin (insulin is irrelevant to antibiotic resistance selection).
• Option d: Correct. Antibiotic resistance genes in plasmids act as selectable markers. When exposed to antibiotics, only bacteria containing the plasmid (with the resistance gene) survive and grow, as they can resist the antibiotic.

Answer:

d. The antibiotic resistance segments ensure only bacteria with the plasmid will grow.