AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which are proteins that regulate the cell cycle. They are a type of internal factor that activate kinases which add a phosphate group to other molecules that help drive the cell cycle forward.
A
Chromatin
B
Spinal Fibers
C
Megatin
D
Cyclins
Explanation: 

Detailed explanation-1: -In order to drive the cell cycle forward, a cyclin must activate or inactivate many target proteins inside of the cell. Cyclins drive the events of the cell cycle by partnering with a family of enzymes called the cyclin-dependent kinases (Cdks).

Detailed explanation-2: -Two groups of proteins, cyclins and cyclin-dependent kinases (Cdks), are responsible for promoting the cell cycle.

Detailed explanation-3: -Summary. Protein phosphorylation is a common way to regulate signaling pathways in the cell cycle. Kinases catalyze phosphoryl transfer from ATP to substrates and change downstream protein-protein interaction in such way that a signaling pathway is either switched on or shut off.

There is 1 question to complete.