Regulating the Cell Cycle
Quiz by Zhao
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24 questions
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- Q1Which of the following is a function of internal regulatory proteins in the cell cycle?They cause cells to slow down or stop their cell cycles.They respond to events outside the cell.They act as checkpoints, allowing the cell cycle to proceed only when certain events have taken place.They stimulate the growth and division of cells.30s
- Q2What are growth factors?Internal regulatory proteins that ensure chromosomes have replicated.External regulatory proteins that stimulate the growth and division of cells.Proteins that prevent the cell from entering anaphase.Proteins that cause apoptosis.30s
- Q3What is the role of apoptosis in multicellular organisms?It stimulates cell division and growth.It is a process of programmed cell death that shapes the structure of tissues and organs.It controls the timing of the cell cycle.It prevents excessive cell growth and keeps body tissues from disrupting one another.30s
- Q4What might happen if the cell cycle is not properly regulated in multicellular organisms?All cells will enter apoptosis.Cells will stop dividing completely.Uncontrolled cell growth leading to diseases like cancer.Cells will only divide when neighboring cells are damaged.30s
- Q5Cyclins are a family of proteins that:Trigger apoptosis in damaged cells.Stimulate cells to slow down or stop the cell cycle.Regulate the timing of the cell cycle in eukaryotic cells.Ensure that spindle fibers have attached to chromosomes.30s
- Q6Which of the following is NOT an example of an internal regulator?Proteins acting as checkpoints within the cell.A protein that prevents a cell from entering anaphase until spindle fibers are attached.Growth factors that stimulate cell division.A protein that makes sure a cell does not enter mitosis until its chromosomes have replicated.30s
- Q7External regulatory proteins:Include growth factors that respond to events outside the cell.Ensure chromosomes have replicated.Are responsible for apoptosis.Act as checkpoints inside the cell.30s
- Q8Why must multicellular organisms tightly control the cell cycle?To prevent excessive cell growth and diseases like cancer.To ensure that all cells divide at the same time.To prevent cell division from occurring.To speed up the growth of all tissues simultaneously.30s
- Q9What is the term for a process of programmed cell death?AnaphaseApoptosisMitosisCytokinesis30s
- Q10What happens to cell division when cells come into contact with other cells in a laboratory culture?They enter apoptosis.They continue dividing rapidly.They differentiate into other cell types.They stop dividing.30s
- Q11What effect do external regulatory proteins on the surface of neighboring cells often have?Stimulate cell division.Initiate apoptosis.Cause cells to slow down or stop their cell cycles.Repair damaged DNA.30s
- Q12In the early 1980s, scientists discovered a protein that could regulate the cell cycle. What did they name this protein?ApoptosisGrowth factorCyclinTumor suppressor30s
- Q13What is the role of cyclins in eukaryotic cells?They regulate the timing of the cell cycle.They prevent DNA replication.They trigger apoptosis.They stimulate cells to enter anaphase.30s
- Q14When an injury occurs, such as a cut or a broken bone, how do cells respond?Cells at the edges of the injury are stimulated to divide rapidly.Cells at the edges of the injury stop dividing.Cells enter apoptosis.All cells in the body begin to divide rapidly.30s
- Q15What are proteins that respond to events inside the cell and act as checkpoints called?Internal regulatorsGrowth factorsExternal regulatorsCyclins30s