AP Bio Chapter 12 Mastering Biology

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

cells with more than one nucleus.

The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin B?

cleavage furrow formation and cytokinesis

How do cancer cells differ from normal cells?

Cancer cells may be immortal.

A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?

92

Which of these is NOT a carcinogen? fat testosterone cigarette smoke UV light all of the above are carcinogens

All if them can cause cancer

Which of the following is found in binary fission but not in mitosis? Following the process, a membrane separates the 2 copies. Replication of DNA begins at an origin. The result produces 2 nuclei. Replicated strands of DNA separate. Duplicated chromosomes attach to the plasma membrane.

Duplicated chromosomes attach to the plasma membrane.

Which statement provides the best description of the interphase portion of the cell cycle?

During interphase, a cell is metabolically active.

If a eukaryotic cell is in the G1 phase of the cell cycle, which statement about the cell's chromosomes must be correct?

Each chromosome is made of a complex of DNA and associated proteins.

_____ is a carcinogen that promotes colon cancer.

Fat (A diet high in fat increases the risk of both colon and breast cancer.)

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in

G1

Which of the following correctly matches a phase of the cell cycle with its description? G2: cell division G1: follows cell division M: duplication of DNA S: immediately precedes cell division All of the above are correctly matched.

G1: follows cell division

The cell cycle control systems of cancer cells differ from those of normal cells. Select the best explanation for this fact.

Genetic changes alter the function of the cancer cell's protein products.

Which of the following is true of kinetochores? They are located at the center of the centrosome; their function is to organize tubulin into elongated bundles called spindle fibers. They attach to the ring of actin along the cytoplasmic surface of the plasma membrane, causing the actin to contract to form the cleavage furrow. They interdigitate at the cell's equator and then move apart, causing the cell to elongate. They are the primary centromere structures that maintain the attachment of the sister chromatids prior to mitosis. They are sites at which microtubules attach to chromosomes.

They are sites at which microtubules attach to chromosomes.

What is true of all cancers?

They have escaped normal cell cycle controls.

Pre-test question 3 Why is it difficult to observe individual chromosomes with a light microscope during interphase? A) The DNA has not been replicated yet. B) The spindle must move them to the metaphase plate before they become visible. C) They leave the nucleus and are dispersed to other parts of the cell. D) Sister chromatids do not pair up until division starts. E) They have uncoiled to form long, thin strands.

They have uncoiled to form long, thin strands.

Which of the following is true of benign tumors, but not malignant tumors?

They remain confined to their original site

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely

a plant cell in the process of cytokinesis.

One difference between cancer cells and normal cells is that cancer cells

continue to divide even when they are tightly packed together.

Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of micro-tubules, its effectiveness must be related to

disruption of mitotic spindle formation.

GO TO

https://quizlet.com/84609466/mastering-biology-chapter-12-flash-cards/ question 15 part A

During _____ the cell grows and replicates both its organelles and its chromosomes.

interphase

In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?

large cells containing many nuclei

Which of the following does not occur during mitosis?

replication of the DNA

The decline of MPF activity at the end of mitosis is due to

the degradation of cyclin.

During _____ both the contents of the nucleus and the cytoplasm are divided.

the mitotic phase