Chapter 8 intro-8.11 Biology

Cells of A benign tumor remain within the tumor, whereas cells of a malignant tumor can spread to other body tissues

A benign and a malignant tumor differ in that _____.

100 units

A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA at G1 of the cell cycle in one of the grasshopper daughter cells?

Cytokinesis in a plant cell

A cell is treated with a drug that prevents the formation of intracellular within the cell vesicles. Which of the following processes would be blocked?

Cytokinesis

A cleavage furrow forms in an animal cell during

92

A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. There are _________ chromatids.

Anaphase and telophase

Single sister chromatids are found in cells at mitotic _____.

Prophase

At which point do centrosomes begin to move a part to the opposite poles of the cell in a dividing human liver cell?

During the S phase

Chromatids form

Mitosis

Consider The process by which bacterial populations grow. What process performs a similar function in humans?

formation of a cleavage furrow

Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with

They organize the microtubules.

During cell division, what role do centrosomes play?

22

How many pairs of autosomes do humans have?

large cells containing many nuclei

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

Cancer cells continuously secrete growth factors into the cell culture medium

In the laboratory, cancer cells failed to show density dependent inhibition of growth in cell culture. What is one explanation that could account for this?

they have uncoiled to form long, thin strands

Individual chromosomes are usually observed with a light microscope during mitosis, even though cells spend more time in interphase. This is because _____.

sites at which microtubules attach to chromosomes

The kinetochores are _____.

Benign tumors do not metastasize; malignant tumors do.

What is the difference between a benign and a malignant tumor?

The mitotic spindle would not form

What would be the immediate consequence of destroying a cells centrosomes?

G1

When examining cells and laboratory, you notice that a particular cell has half as much DNA as the surrounding cells. It appears that the cell's cell cycle halted at checkpoint

Divide by mitosis

When forming buds, hydras _____.

Being completely surrounded by other cells

Which of the following conditions would result in inhibition of cell division due to density-dependent factors?

Chromatids separate

Which of the following occurs during mitosis?