Question

In general terms, normally a cell in your body crosses a checkpoint in the cell cycle when

A. It receives a "go-ahead" signal directly from your brain
B. Concentrations of proteins in the cytoplasm reach the appropriate level
C. It receives a "go-ahead" signal from your external environment
D. Concentrations of DNA in the nucleus reach the appropriate level
E. A mutation in the DNA occurs

Answer 1

B. Concentrations of proteins in the cytoplasm reach the appropriate level

Step-by-step explanation:

We can say that the cell cycle checkpoints is an important cell cycle control. In this regard, it is important to note that within a cell, the passage from one phase to another is controlled by regulatory factors that are characteristically proteinic and act at the so-called cell cycle checkpoints.

A cell passes the first checkpoint when protein concentrations in the cytoplasm reach the appropriate level.