Chapter 11

Mitosis is responsible for what key process in multicellular eukaryotes? -reproduction -growth -wound repair -All of the listed responses are correct.

All of the listed responses are correct.

What two types of defects does a cancerous cell possess? -Cancerous cells are prevented from dividing and have inhibited growth patterns. -Cancerous cells possess defects that make proteins required for cell growth inactive and tumor suppressor genes active. -Cancerous cells lack the ability to carry out cellular respiration and photosynthesis. -Cancerous cells possess defects that make proteins required for cell growth active and tumor suppressor genes inactive.

Cancerous cells possess defects that make proteins required for cell growth active and tumor suppressor genes inactive.

Two important checkpoints that regulate the cell's progression through the cell cycle are _____. -G1 and S -G1 and G2 -prophase and telophase -S and M

G1 and G2

During what phase of the cell cycle does the DNA become replicated? -S -G1 -M -G2

S

In which mitotic phase are the sister chromatids separated and pulled to opposite poles? -anaphase -prophase -telophase -metaphase

anaphase

MPF, or mitosis-promoting factor, consists of two important cell cycle regulatory proteins called _____. -rubisco and ATP synthase -cyclin and cyclin-dependent kinase (CDK) -actin and myosin -tubulin and kinetochorin

cyclin and cyclin-dependent kinase (CDK)

In which mitotic phase do the chromosomes condense and the mitotic spindle begin to form? -telophase -anaphase -metaphase -prophase

prophase

What is the difference between a chromatid and a chromosome? -A chromatid always consists of two linear DNA molecules, whereas a chromosome always consists of just one linear DNA molecule. -A chromatid is one half of a replicated chromosome, whereas a chromosome consists of DNA wrapped around proteins in a highly organized manner. -Chromosomes are always replicated, whereas chromatids are not. -Chromatids consist of DNA, whereas chromosomes consist of proteins.

A chromatid is one half of a replicated chromosome, whereas a chromosome consists of DNA wrapped around proteins in a highly organized manner.

The defining characteristic of a malignant tumor is that _____. -it is benign -its cells can spread to other parts of the body -it grows in a single location -its cells cannot cause cancer

its cells can spread to other parts of the body

The division of the cytoplasm following mitosis is called _____. -cytokinesis -meiosis -interphase -telophase

cytokinesis