AP bio mitosis

G1 is represented by which numbered part(s) of the cycle?

1 or 5

Which number represents DNA synthesis?

2

Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?

32

In the figure above, mitosis is represented by which numbered part(s) of the cycle?

4

Density-dependent inhibition is explained by which of the following?

As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing.

Cells from an advanced malignant tumor most often have very abnormal chromosomes, and often an abnormal total number of chromosomes. Why might this occur?

Chromosomally abnormal cells can still go through cell cycle checkpoints

For anaphase to begin, which of the following must occur?

Cohesin must be cleaved enzymatically

Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?

Cyclin dependent kinase

Which of the following best describes the role of mitosis in the cell cycle?

Distributing replicated chromosomes to daughter nuclei

After which checkpoint is the cell first committed to continue the cell cycle through M?

G1

The epidermal growth factor receptor EGFR is a cell surface receptor. When a growth factor binds to EGFR, the receptor is activated. The activated EGFR triggers a signal transduction pathway, which leads to increased frequency of cell division. Which of the following best predicts the effect of a mutation that causes EGFR to be active in the absence of a growth factor?

Increased cell division will lead to the formation of a tumor

Which of the following is true of mitosis?

It maintains the same chromosome number in the daughter cells as in the parent cell

A researcher examining a root tip observes a plant cell with condensed sister chromatids, kinetochores with attached microtubules, and individual chromosomes that are aligned at the equatorial plate of the cell. Which of the following best describes what the next process will be in the cell?

Paired chromatids will separate, and the new daughter chromosomes will move toward opposite poles of the cell.

Based on the model of eukaryotic cell cycle regulation shown in the figure, which of the following best describes the effect of a drug that blocks the production of the mitotic cyclin?

The cell would be prevented from entering mitosis, and the cell would stop dividing

Researchers studying cell cycle regulation in budding yeast have observed that a mutation in the CDC15 gene causes cell cycle arrest in telophase when the yeast cells are incubated at an elevated temperature. Which of the following statements best predicts the effect of the cell cycle arrest on proliferating yeast cells?

The yeast cells will replicate their chromosomes but will fail to complete cytokinesis

Which of the following is true concerning cancer cells?

When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture

During which phase of mitosis do the chromatids become chromosomes?

anaphase

The centromere is a region in which

chromatids remain attached to one another until anaphase

Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

cyclin

DNA replication occurs

during the S phase of the cell cycle