Unit 6 test

Question 1

The cell cycle is divided into interphase and mitosis.

Answer 1

False; The cell cycle has three stages: interphase, mitosis, and cytokinesis.

Question 2

In plant cells, cytokinesis begins with a furrow that pinches the cell.

Answer 2

False; Plants have a rigid cell wall that covers their plasma membrane. Therefore, they must form a new structure called a cell plate between the daughter cells.

Question 3

During meiosis I, homologus chromosome pairs are separated when the centromeres split apart.

Answer 3

False. The centromeres separate in meiosis II to form four haploid cells.

Question 4

By the end of prophase, each of the following has occurred except what?

Answer 4

Forming of the spindle

Question 5

Which of the cells depicted in the line graph in Figure 9-2 are most likely cancerous?

Answer 5

A

Cancer is the uncontrolled growth and division of cells.

Question 6

Why is the synthesis stage called this?

Answer 6

because DNA synthesis is taking place, “Synthesis” refers to the synthesis of DNA during this phase.

Question 7

A cell has 12 chromosomes. How many chromosomes will each daughter cell have?

Answer 7

12. During mitosis, the cell’s replicated genetic material separates and the cell prepares to divide into two cells.

Question 8

The cell cycle is regulated by..?

Answer 8

The normal cell cycle is regulated by cyclin proteins.

Question 9

DNA replication occurs during..?

Answer 9

interphase.

Question 10

The typical growth period of a cell occurs during which stage of the cell cycle?

Answer 10

The normal growth of the cell occurs in Gap 1 before the chromosomes are replicated.

Question 11

Crossing over would most likely occur during which stage of the cell cycle?

Answer 11

Prophase I; when homologous chromomosomes line up in pairs.

Question 12

Which is the best description of the events that take place during anaphase II?

Answer 12

Anaphase II is part of Meiosis II. In Anaphase II, the centromeres separate. The sister chromatids turn into individual chromosomes and move to opposite ends (poles) of the cell.

Question 13

What is the role of the spindle fibers?

Answer 13

allign and seperate chromosomes

Question 14

The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?

Answer 14

It has 23 chromosomes.

Question 15

During which phase of meiosis do homologous pairs of chromosomes line up next to one another along the equator?

Answer 15

Metaphase I

Question 16

Consider the cell labeled X in Figure 10-9 containing 4 chromosomes. Which of the four cells below it represents a healthy gamete that could be produced from this cell?

Answer 16

A.