AP Biology Unit 4

What is the process by which cells communicate with each other?

• Cell transportation

• Cell division

• Cell reception

• Cell signaling

Explain the concept of signal transduction in cell communication.

• Signal transduction is the process of cell division

• Signal transduction involves the movement of cells in the body

• Signal transduction is the process of cell respiration

• Signal transduction is the process by which a cell converts one kind of signal or stimulus into another.

What is the role of receptors in cell communication?

• Receptors in cell communication have no role in triggering cellular responses

• Receptors in cell communication are only found in plant cells

• Receptors in cell communication produce signaling molecules

• Receptors in cell communication recognize and bind specific signaling molecules to trigger a cellular response.

How do cells regulate their progression through the cell cycle?

• Checkpoints controlled by cyclin-dependent kinases (CDKs) and cyclins

• Cells regulate their progression through the cell cycle by external factors only

• Cells regulate their progression through the cell cycle by random chance

• Cells regulate their progression through the cell cycle by following a predetermined schedule

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Describe the role of ribosomes in a cell.

• They store genetic information.

• They synthesize proteins.

• They break down waste materials.

• They transport substances across the cell membrane.

Explain how the structure of the cell membrane contributes to its function.

• The rigid structure provides support and protection.

• The fluid mosaic model allows selective permeability.

• The thick layer prevents all substances from entering.

• The solid structure allows for easy transport of materials.

What is the primary function of the mitochondria in eukaryotic cells?

• Photosynthesis

• Protein synthesis

• Energy production

• Lipid storage

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What is the significance of mitosis in the cell cycle?

• Mitosis leads to cell death

• Mitosis ensures genetic stability and growth by producing two identical daughter cells.

• Mitosis causes genetic mutations

• Mitosis is only relevant in plant cells

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How do cyclins and cyclin-dependent kinases (CDKs) regulate the cell cycle?

• Cyclins bind to CDKs to form complexes that regulate the cell cycle by phosphorylating target proteins.

• Cyclins degrade CDKs to stop the cell cycle

• Cyclins inhibit CDKs to halt the cell cycle progression

• Cyclins detach from CDKs to accelerate the cell cycle

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Explain the difference between interphase and mitotic phase in the cell cycle.

• Interphase is the phase where the cell prepares for division, while mitotic phase is when the cell rests.

• Interphase is the phase where the cell grows and prepares for division, while mitotic phase is the phase where the cell actually divides.

• Interphase is when the cell divides, while mitotic phase is when the cell grows.

• Interphase and mitotic phase are the same thing.

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