Biology Quiz 9

Front 1

What cell cycle regulatory protein is a tumor-suppressor protein?

Back 1

p53

Front 2

Proteins with postitive charges that are wrapped around DNA within chromosomes are:

Back 2

histones

Front 3

If cell division is no longer posssible, eukaryotes can arrest the cell cycle. During which stage is this decision made?

Back 3

G1

Front 4

What causes cancer in cells?

Back 4

Damage to genes failing to stop cell division.

Front 5

During metaphase:

Back 5

Chromosomes line up on the equatorial plane.

Front 6

The G1, S, and G2 phases of the cell cycle are collectively know as:

Back 6

interphase

Front 7

Most eukaryotes have between ___________ chromosomes in their body cells.

Back 7

10 and 50

Front 8

Cigarette smoke causes mutations in the p53 gene.

Back 8

True

Front 9

Which of the following does not occur during telophase:

Back 9

The nuclear membrane disappears.

Front 10

Which is not correct about the way prokaryotes divide?

Back 10

The replication of DNA occurs in one direction around the circle.

Front 11

All of the following are correct about cancer except:

Back 11

benign cells are those that have metastasized

Front 12

What is telomerase?

Back 12

An enzyme that adds bases back to the tip of chromosomes every time a cell divides

Front 13

The spindle is:

Back 13

the network of protein cables that will pull the chromatids ends of th cell

Front 14

Which is incorrect about chromosomes?

Back 14

Chromosomes all have the same number of genes on them.

Front 15

The eukaryotic cell cycle is controlled at several points; which of these is not a control point?

Back 15

Cell growth is assessed at the S checkpoint.

Front 16

You look in the microscope and see sister chromatids moving to opposite sides of the cell. You conclude the cell is in:

Back 16

anaphase

Front 17

During which stage of the cell cycle does the synthesis of microtubues occur?

Back 17

Prophase

Front 18

After duplicaton, sister chromatids, remain joined together:

Back 18

by the centromere

Front 19

All of the following are correct about HER2 except:

Back 19

Most colon cancers have excess copies of this protein on their cells.

Front 20

During which mitotic stage is the spindle disassembled, the nuclear membrane formed and the chromosome uncoil?

Back 20

Telophase

Front 21

Identical copies of each chromosome are called __________and are joined at the _______.

Back 21

Sister chromatids; centromere

Front 22

Which is incorrect about p53?

Back 22

It stimulates th activity of DNA repair enzymes.

Front 23

The diploid number of chromosomes in humans is 46. The haploid number is:

Back 23

23

Front 24

Mutations disabling key elements of the G1 checkpoint are associated with many cancers.

Back 24

True

Front 25

The proper sequence, beginning to end, for stages of mitosis is:

Back 25

Prophase, metaphase, anaphase and telophase