Question

each strand of a replicated double helix of dna is called a ______ . a chromatid b chromosome c autosome d centriole

Explanation:

To solve this, we analyze each option:

• Option A: A chromatid is one of the two identical strands of a replicated chromosome (or double - helix DNA after replication). This matches the description in the question.
• Option B: A chromosome is a more complex structure that, after replication, consists of two chromatids. So a single strand of replicated DNA is not a chromosome.
• Option C: An autosome is a non - sex chromosome, which has nothing to do with the structure of a replicated DNA strand.
• Option D: A centriole is an organelle involved in cell division (like spindle formation), not related to the structure of DNA strands.

Answer:

A. chromatid