BIO 181 Chapter 12

At what part of the cell cycle would you see a chromosome that looks like this?

• G1

• G2

• M

• S

The chromosome begins M phase looking as shown. When does it split?

• prophase

• prometaphase

• metaphase

• anaphase

• telophase

A new cell is found and separation of its chromosomes is examined. If the darker patches in the yellow lines are places where the spindle was bleached with a laser, what do these images tell us?

• Chromosomes are separated by microfilaments.

• Chromosomes are not separated.

• Microtubules shorten at the centromere end.

• Microtubules shorten at the chromosome end.

From prophase through metaphase of mitosis, each chromosome has _____ DNA molecules, while from anaphase through telophase of mitosis, each chromosome has _____ DNA molecule(s).

• two; one

• homologous; nonhomologous

• condensed; decondensed

• nonsister chromatid; sister chromatid

Which event will likely occur next in a eukaryotic cell entering prometaphase?

• The chromosome material will condense.

• Chromosomes will be moved toward alignment at the metaphase plate.

• Kinetochores will link some microtubules to the centromeres.

• The nuclear membranes will fragment into vesicles.

If you were given a slide and told that the cells on it were performing cytokinesis, how would you tell if you had plant cells or animal cells?

• Look for a cell plate or a cleavage furrow.

• Look for condensed or decondensed chromosomes.

• Look for an intact or a dispersed nuclear membrane.

• Look for more or less layers in the cell wall.

Which comes immediately after S phase in the cell cycle?

• G1

• G2

• mitosis

• cytokinesis

From the pole to the chromosome, what is the correct order?

• centrosome, kinetochore, chromosome

• kinetochore, chromosome, centrosome

• chromosome, kinetochore, centromere

Binary fission is more like animal cell division than plant cell division because

• bacteria and animals have more organelles than plants.

• bacteria and animals both pinch in to separate the cytoplasm into two pieces.

• bacteria and animals use microfilaments to divide the cell.

• bacteria and animals both have two copies of each chromosome, while plants have four.