Question:
Identify the correct statements regarding biotechnology.
(A). Exonucleases cut the nucleotides at the ends of DNA strands.
(B). The sequences recognized by restriction enzymes are 4 to 8 nucleotides long.
(C). Baculoviruses are not vectors.
(D). Agrobacterium tumefaciens is a bacterium which can live only in plants.
(E). The bacteria protect their own DNA from nuclease attack by methylating the bases at susceptible sites.
Choose the correct answer from the options given below:
Identify the correct statements regarding biotechnology.
(A). Exonucleases cut the nucleotides at the ends of DNA strands.
(B). The sequences recognized by restriction enzymes are 4 to 8 nucleotides long.
(C). Baculoviruses are not vectors.
(D). Agrobacterium tumefaciens is a bacterium which can live only in plants.
(E). The bacteria protect their own DNA from nuclease attack by methylating the bases at susceptible sites.
Choose the correct answer from the options given below:
(A). Exonucleases cut the nucleotides at the ends of DNA strands.
(B). The sequences recognized by restriction enzymes are 4 to 8 nucleotides long.
(C). Baculoviruses are not vectors.
(D). Agrobacterium tumefaciens is a bacterium which can live only in plants.
(E). The bacteria protect their own DNA from nuclease attack by methylating the bases at susceptible sites.
Choose the correct answer from the options given below:
Show Hint
Baculoviruses are vectors, and Agrobacterium is a soil bacterium, so (C) and (D) are false.
Updated On: Nov 12, 2026
- (A), (B) and (D) only.
- (A), (B), (C) and (D) only.
- (A), (B), (C), (D) and (E).
- (A), (B) and (E) only.
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
This question tests facts about enzymes and vectors in genetic engineering.
Step 2: Check each statement
(A) is true: exonucleases remove nucleotides from the ends of DNA.
(B) is true: restriction enzymes recognise sites 4 to 8 nucleotides long.
(C) is false: baculoviruses are used as vectors.
(D) is false: Agrobacterium tumefaciens is a soil bacterium and not restricted to plants.
(E) is true: bacteria methylate their own DNA to protect it from their restriction enzymes.
Step 3: Compare the options
The correct statements are (A), (B) and (E).
Final Answer:
Statements (A), (B) and (E) only are correct. \[ \boxed{\text{(D) }\text{(A), (B) and (E) only.}} \]
This question tests facts about enzymes and vectors in genetic engineering.
Step 2: Check each statement
(A) is true: exonucleases remove nucleotides from the ends of DNA.
(B) is true: restriction enzymes recognise sites 4 to 8 nucleotides long.
(C) is false: baculoviruses are used as vectors.
(D) is false: Agrobacterium tumefaciens is a soil bacterium and not restricted to plants.
(E) is true: bacteria methylate their own DNA to protect it from their restriction enzymes.
Step 3: Compare the options
The correct statements are (A), (B) and (E).
Final Answer:
Statements (A), (B) and (E) only are correct. \[ \boxed{\text{(D) }\text{(A), (B) and (E) only.}} \]
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