AP Unit 4 Review: Cell Communication & The Cell Cycle

What is the name of the signaling molecule in cell communication?

• ligand

• receptor

• operon

• inhibitor

Phosphorylation cascades are often used for

• reception

• responses

• amplification

• termination

Programmed cell death is known as

• mutation

• termination

• cytokinesis

• apoptosis

Q4: Which type of enzyme takes part in this process?

• protein phosphatase

• protein hydrolyase

• protein synthase

• protein kinase

What are receptors on the cell membrane made of?

• Catalyst

• Enzymes

• Proteins

• Lipids

Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because:

• they are species specific

• they always lead to the same cellular response

• they amplify the original signal many times

• they counter the harmful effects of phosphatases

What answer choice is NOT one of the three steps of signal transduction?

• a signaling molecule binding to a specific receptor

• activation of a signal transduction pathway

• production of a cellular response

• signal feedback sent to deactivate hormone or environmental stimulus

How do bacteria sense local population density?

• population sensing

• signal sensing

• quorum sensing

• bacterial sensing

1.  Each of the following numbered processes are involved in signal transduction pathways:  
 I.  Response  
II.  Amplification  
 III.  Reception  
IV.  Transduction
Which of the following represents the sequence of events in a typical signal transduction pathway?

• I, II, III, IV
• III, I, IV, II
• II, IV, I, III
• III, IV, II, I

Researchers studying cell cycle regulation in budding yeast have observed that a mutation in the CDC15 gene causes cell cycle arrest in telophase when the yeast cells are incubated at an elevated temperature.

Which of the following statements best predicts the effect of the cell cycle arrest on proliferation yeast cells?

• The yeast cells will initiate mitosis but will fail to complete the G2 phase.

• The yeast cells will replicate their chromosomes but will fail to complete cytokinesis

• The yeast cells will replicate their organelles but will fail to complete the S phase.

• The yeast cells will transition out of G0 but will fail to complete the G1 phase.