Question

Which form of DNA is most commonly found in nature under physiological conditions?

• A. A-DNA
• B. B-DNA
• C. C-DNA
• D. Z-DNA

Hint:

B-DNA: right-handed, most common.
A-DNA: right-handed, found under dehydrating conditions.
Z-DNA: left-handed.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
DNA can exist in different conformations.
Each conformation has specific characteristics.

Step 2: Key Formula or Approach:
No specific formula.
Need to know the different DNA conformations.

Step 3: Detailed Explanation:
B-DNA is the most common form of DNA in nature.
It is the standard right-handed helix.
Under physiological conditions (high humidity, salt concentration), B-DNA is found.
A-DNA is found under dehydrating conditions.
Z-DNA is a left-handed helix.
Thus, B-DNA is the most commonly found form.

Step 4: Final Answer:
B-DNA is most commonly found in nature under physiological conditions.
Hence, the correct option is (B).