Cell Communication and Cell Cycle

What is the primary function of cell communication in multicellular organisms?

• To facilitate nutrient absorption

• To coordinate cellular activities

• To eliminate waste products

• To replicate DNA

Which of the following is a type of cell signaling that involves direct contact between cells?

• Endocrine signaling

• Paracrine signaling

• Autocrine signaling

• Juxtacrine signaling

During which phase of the cell cycle does DNA replication occur?

• G1 phase

• S phase

• G2 phase

• M phase

What is the role of cyclins in the cell cycle?

• To repair DNA damage

• To regulate the timing of the cell cycle

• To synthesize proteins

• To transport molecules across the cell membrane

Tags

NGSS.HS-LS1-4

Which molecule acts as a second messenger in many signal transduction pathways?

• ATP

• cAMP

• NADH

• FADH2

What is the function of the mitotic spindle during cell division?

• To replicate DNA

• To separate sister chromatids

• To form the nuclear envelope

• To synthesize RNA

Tags

NGSS.HS-LS1-4

Which of the following is an example of a ligand that binds to a cell surface receptor?

• Insulin

• DNA polymerase

• ATP synthase

• Ribosome

What is apoptosis?

• Uncontrolled cell division

• Programmed cell death

• Cell differentiation

• Cell growth

Which phase of the cell cycle is characterized by the separation of sister chromatids?

• Prophase

• Metaphase

• Anaphase

• Telophase

Tags

NGSS.HS-LS1-4

How do G-protein coupled receptors transmit signals inside the cell?

• By opening ion channels

• By activating G-proteins

• By phosphorylating proteins

• By binding to DNA