Cell Cycle and Cancer Mechanisms

The video explains oncogenetics, focusing on the cell cycle and its phases, including G0, G1, S, G2, and M phases. It highlights the importance of checkpoints to prevent errors. Cyclins and CDKs are crucial for cell cycle progression. Genetic mutations can lead to cancer by activating oncogenes and inactivating tumor suppressor genes. The video details how mutations in Ras and Myc genes lead to uncontrolled cell growth and how tumor suppressor genes like p53 prevent abnormal cell proliferation.

What is the primary purpose of checkpoints in the cell cycle?

• To stop the cell cycle permanently

• To ensure no errors occur during cell division

• To initiate apoptosis

• To speed up cell division

Which proteins are crucial for driving the cell cycle forward?

• Actin and myosin

• Ribosomes and lysosomes

• Cyclins and CDKs

• Histones and nucleosomes

What can result from an overproduction of cyclins and CDKs?

• DNA repair

• Cell cycle arrest

• Uncontrolled cell growth

• Apoptosis

Which type of genetic mutation involves a single nucleotide change?

• Epigenetic modification

• Chromosomal rearrangement

• DNA amplification

• Point mutation

What is the effect of DNA amplification in cancer cells?

• Increases gene expression

• Decreases gene expression

• Prevents cell division

• Causes cell death

How does a mutation in the Ras gene affect cell growth?

• It initiates apoptosis

• It repairs damaged DNA

• It causes continuous activation of growth signals

• It stops cell growth

What role does the Myc gene play in normal cells?

• It triggers cell death

• It repairs DNA

• It promotes cell growth and survival

• It inhibits cell growth

What is the function of p53 in the cell cycle?

• To amplify DNA

• To activate oncogenes

• To repair damaged DNA and induce apoptosis if necessary

• To promote cell division

What happens when tumor suppressor genes like p53 are inactivated?

• Cells undergo apoptosis

• Cells repair DNA more efficiently

• Cells stop dividing

• Cells bypass checkpoints and grow uncontrollably

Which of the following is NOT a mechanism by which cancer cells bypass normal growth controls?

• Genetic mutations

• Increased apoptosis

• Inactivation of tumor suppressor genes

• Activation of oncogenes