Multiple Choice
Which of the following correctly identifies a cell-cycle checkpoint and a criterion required for a cell to pass it?
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11. Cell Division
Cell Cycle Regulation
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Which of the following is a family of proteins that regulates the cell cycle in eukaryotic cells?
A
Tubulins
B
Histones
C
Cyclins
D
Actins
Verified step by step guidance1
Step 1: Understand the cell cycle in eukaryotic cells. The cell cycle is a series of events that cells go through to grow and divide. It consists of phases such as G1, S, G2, and M, and is tightly regulated to ensure proper cell division.
Step 2: Learn about the role of regulatory proteins in the cell cycle. These proteins ensure that the cell progresses through the cycle in a controlled manner, preventing errors such as uncontrolled cell division.
Step 3: Focus on cyclins, which are a family of proteins specifically involved in regulating the cell cycle. Cyclins bind to cyclin-dependent kinases (CDKs) to form complexes that activate or inhibit various processes in the cell cycle.
Step 4: Compare cyclins to other proteins listed in the problem. Tubulins are involved in microtubule formation, histones are associated with DNA packaging in chromatin, and actins are part of the cytoskeleton. None of these directly regulate the cell cycle like cyclins do.
Step 5: Conclude that cyclins are the correct answer because they are directly responsible for regulating the progression of the cell cycle in eukaryotic cells.
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Cell Cycle Regulation practice set
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