Cell Cycle Questions Online Test 5

1. What causes the decrease in the amount of cyclin at a specific point in the cell cycle?

• an increase in production once the restriction point is passed
• the cascade of increased production once its protein is phosphorylated by Cdk
• the changing ratio of cytoplasm to genome
• its destruction by a process initiated by the activity of its complex with a cyclin

2. Which of the following is released by platelets in the vicinity of an injury?

• PDGF
• MPF
• protein kinase
• cyclin

Cell Cycle MCQs part 4

1. In order for anaphase to begin, which of the following must occur?

• Chromatids must lose their kinetochores
• Cohesin must attach the sister chromatids to each other
• Cohesin must be cleaved enzymatically
• Kinetochores must attach to the metaphase plate.

2. Why do chromosomes coil during mitosis?

• to increase their potential energy
• to allow the chromosomes to move without becoming entangled and breaking
• to allow the chromosomes to fit within the nuclear envelope
• to allow the sister chromatids to remain attached

Cell Communication And Signalling MCQs Part 1

1. Which of the following is the correct order of events in signal transduction?

• Receptor -> Chemical Signal -> Target Proteins -> Intracellular Proteins ->Cell Response
• Chemical Signal -> Target Proteins-> Receptor -> Intracellular Proteins ->Cell Response
• Chemical Signal -> Receptor -> Intracellular Proteins -> Target Proteins -> Cell Response
• Chemical Signal -> Receptor -> Target Proteins -> Intracellular Proteins -> Cell Response

2. Which of the following types of chemical signals is secreted in the blood and travels long distances to its target.

• Neurotransmitters
• Cytokines
• Hormones
• Target Proteins

3. Which of the following is a characteristic of a receptor?

• Speed
• Specificity
• Saturation
• All except a

4. This type of extracellular receptor causes a transporter to open or close to allow particles through once a chemical signal binds.

• G couple Protein
• JAK Kinase
• Tyrosine Kinase
• Ligand Gated Ion Channel

5. An intracellular portion of this receptor phosphorylates intracellular Proteins.

• G coupled Protein Receptor
• Tyrosine Kinase
• Ligand Gated Ion Channel
• All of the following

6. Once Adenylyl cyclase is activated it

• Opens Ca2+ doors on the Sarcoplasmic Reticulum
• Makes cAMP
• Phosphorylates intracellular proteins
• Causes a change in membrane potential

7. IP3 does which of the following?

• Opens Ca2+ doors on the Sarcoplasmic Reticulum
• Activates target proteins
• Both a and b
• None of the above

8. An insulin receptor is an example a _____________ receptor.

• Tyrosine Kinase
• G couple Protein
• Ligand Gated Ion Channel
• JAK Kinase

9. Most cytokine receptors are an example a _____________ receptor.

• Tyrosine Kinase
• G couple Protein
• Ligand Gated Ion Channel
• JAK Kinase

10. Beta adrenergic receptors on cardiac contractile cells are an example a _____________ receptor.

• Tyrosine Kinase
• G couple Protein
• Ligand Gated Ion Channel
• JAK Kinase

Score =

Correct answers:

Cell Communication And Signalling MCQs Parts => 1..

Cell Cycle MCQs Part 3

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Cell Cycle MCQs part 2

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Cell Cycle MCQs Part 1

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Enzymes MCQs Part 2

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