Exploring the Cell Cycle and Its Relation to Cancer

Dr. Jim's lecture covers the cell cycle, its phases, and the importance of cell division for growth and repair. The lecture explains the cell cycle's phases: G1, S, G2, and mitosis, and highlights the role of checkpoints in preventing errors. It also discusses apoptosis and how failures in these processes can lead to cancer. The lecture concludes with a discussion on cancer causes, including genetic and environmental factors, and encourages students to ask questions and watch the next lecture on mitosis.

Why is DNA replication crucial before cell division?

• To increase the size of the cell

• To ensure each new cell has a complete set of DNA

• To create more proteins

• To remove old DNA

What is the main purpose of the cell cycle?

• To create energy for the cell

• To replicate DNA and divide into two new cells

• To produce proteins

• To destroy old cells

Which phase of the cell cycle is the longest?

• Mitosis

• G1 phase

• Interphase

• S phase

What happens during the G0 phase?

• Cells enter a state of suspended animation

• Cells divide into two new cells

• Cells grow rapidly

• Cells prepare for DNA replication

What is apoptosis?

• DNA replication

• Cell growth

• Programmed cell death

• Cell division

What is the main difference between benign and malignant tumors?

• Benign tumors grow rapidly, malignant tumors grow slowly

• Benign tumors are painful, malignant tumors are not

• Benign tumors do not spread, malignant tumors do

• Benign tumors are cancerous, malignant tumors are not

What is metastasis?

• The growth of benign tumors

• The spread of cancer cells to other parts of the body

• The process of cell division

• The replication of DNA

Which of the following is NOT a characteristic of cancer cells?

• They can invade other tissues

• They have irregularly shaped nuclei

• They undergo apoptosis

• They grow uncontrollably

What can cause the genes that promote cancer to be turned on?

• Exposure to UV radiation

• Drinking water

• Lack of exercise

• Eating fruits and vegetables

What is the role of repressor genes in cancer prevention?

• They cause DNA mutations

• They promote cell growth

• They help in DNA replication

• They suppress the growth of cancer cells