Question

Which of the following is not true of cloning vectors?

A. They usually contain multicloning sites or polylinkers

B. They contain at least two replication origins

C. They can be replicated within an appropriate host

D. All of these are true of cloning vectors

Answer 1

D. All of these are true of cloning vectors.

The statement "All of these are true of cloning vectors" is incorrect. Not all of the options provided are true of cloning vectors.

Option B, "They contain at least two replication origins," is not true of cloning vectors in general. While many cloning vectors do contain replication origins (origin of replication), they do not necessarily have multiple replication origins. Cloning vectors typically have a single replication origin to ensure their replication within the host organism.

Therefore, the correct answer is D. All of these are true of cloning vectors.