Question

Condensins:

A. are degraded when cells enter M-phase
B. assemble into complexes on the DNA when phosphorylated by M-Cdk
C. bind to DNA before DNA replication begins
D. All of the above

Answer 1

Condensins assemble into complexes on the DNA when phosphorylated by M-Cdk.

Step-by-step explanation:

Condensins are proteins involved in the organization and compaction of chromosomal DNA during cell division. They play a crucial role in the segregation of chromosomes during mitosis.

Option A is incorrect because condensins are not degraded during M-phase, rather they are responsible for condensation of chromosomes. Option B is correct because condensins assemble into complexes on the DNA when phosphorylated by M-Cdk. Option C is incorrect because condensins bind to DNA during prophase, not before DNA replication begins. Condensins bind to the sister chromatids during prophase, which is after DNA replication has occurred in the previous S phase.

Therefore, the correct answer is Option B: assemble into complexes on the DNA when phosphorylated by M-Cdk.