Question

exam lesson name: introduction to biotechnology
exam number: 700795rr
exam guidelines
exam instructions
question 1 of 20 :
select the best answer for the question.

1. what molecular cloning tool do bacteria naturally produce to defend against viral infections?

○ a. pcr
○ b. dna ligase
○ c. antibiotics
○ d. restriction enzymes
□ mark for review (will be highlighted on the review page)

Explanation:

To solve this, we analyze each option:

• Option A: PCR (Polymerase Chain Reaction) is a technique, not produced by bacteria for defense.
• Option B: DNA ligase joins DNA fragments, not for viral defense.
• Option C: Antibiotics target bacteria, not viruses.
• Option D: Restriction enzymes are produced by bacteria to cut viral DNA, defending against infections.

Answer:

D. Restriction enzymes