Exploring the Cell Cycle and Mitosis

The video tutorial covers the cell cycle, its regulation, and related lab investigations. It begins with an introduction to the lesson objectives, followed by a discussion on cell communication and signaling pathways. The tutorial then delves into the details of the cell cycle, focusing on mitosis and the role of checkpoints in regulation. It also addresses the effects of disruptions in the cell cycle, such as cancer and apoptosis, and explains the role of p53 in DNA damage response. The video includes a lab investigation on onion root tips and a chi-square analysis to test hypotheses. The session concludes with practice questions, a review of key concepts, and a homework assignment.

What is the primary focus of today's lesson in AP Biology?

• The structure of DNA and RNA

• Genetic mutations and their effects

• The cell cycle and its regulation

• Photosynthesis and cellular respiration

Tags

NGSS.HS-LS1-4

NGSS.HS-LS2-5

Which phase of the cell cycle is characterized by general cell growth?

• M phase

• G2 phase

• G1 phase

• S phase

During which phase are chromosomes replicated?

• S phase

• G1 phase

• M phase

• G2 phase

What is the main outcome of mitosis?

• Two genetically identical cells

• Four genetically different cells

• Two genetically different cells

• Four genetically identical cells

Tags

NGSS.HS-LS1-4

What is the role of cyclin-dependent kinases (CDKs) in the cell cycle?

• They repair damaged DNA

• They degrade cyclins

• They phosphorylate target proteins

• They inhibit cell division

Which checkpoint is considered the most critical for cell cycle progression?

• G2 checkpoint

• G1 checkpoint

• M checkpoint

• S checkpoint

What happens to cells that do not pass the G1 checkpoint?

• They enter the S phase

• They undergo apoptosis

• They proceed to mitosis

• They enter the G0 phase

What is density-dependent inhibition?

• Cells die when they are too crowded

• Cells grow larger when they are crowded

• Cells divide faster when they are crowded

• Cells stop dividing when they are too crowded

What is the purpose of the lab investigation involving onion roots?

• To measure the rate of cellular respiration

• To analyze genetic mutations in onion cells

• To observe the process of photosynthesis

• To study the effects of different environments on cell division

Tags

NGSS.HS-LS1-4

What is the null hypothesis in the lab investigation on onion root cells?

• Lectin has no effect on cell division

• Caffeine accelerates cell division

• There is no difference in cell division among treatments

• Distilled water inhibits cell division

Tags

NGSS.HS-LS1-4