Question 1

Microtubules are formed between the poles and the chromosomes to make up the spindle.This is most likely to occur during

Accepted Answer

A)  G1. 
B)  G2. 
C)  anaphase. 
D)  metaphase. 
E)  prometaphase.

Question 2

When dividing cells are examined under a light microscope, chromosomes first become visible during

Accepted Answer

A)  interphase. 
B)  the S phase. 
C)  prophase. 
D)  G1. 
E)  G2.

Question 3

During a process known as _______, a piece of one chromosome breaks off and becomes joined to a different chromosome.

Accepted Answer

The answer of During a process known as _______, a...

Question 4

If n = 26 for a species of wildflower, how many chromosomes would be in each of the gametes?

Accepted Answer

A)  1 
B)  2 
C)  13 
D)  26 
E)  52

Question 5

A potato has a diploid number of 48.If an egg of this plant has 23 chromosomes, the most likely explanation is that

Accepted Answer

A)  normal meiosis has occurred. 
B)  nondisjunction occurred during meiosis I. 
C)  normal mitosis has occurred. 
D)  nondisjunction occurred during mitosis. 
E)  crossing over occurred during meiosis I.

Question 6

Bacteria have a short sequence called _______ where DNA synthesis begins.

Accepted Answer

The answer of Bacteria have a short sequence called _______...

Question 7

How were the internal signals that control the transitions between stages of the cell cycle discovered?

Accepted Answer

A)  By looking at DNA sequences at different stages of the cell cycle 
B)  By looking at RNA sequences at different stages of the cell cycle 
C)  By fusing different cells together 
D)  By examining changes in the mitotic spindle 
E)  None of the above

Question 8

If the haploid number of a species of plant is 15, and you discover an individual with 60 chromosomes, you can conclude that the individual is a(n) _______.

Accepted Answer

The answer of If the haploid number of a species...

Question 9

A tissue in a plant contains three types of cells that divide at different rates.You would expect the cell type that divides most rapidly to spend _______ time in the _______ phase than the other cells.

Accepted Answer

A)  more; G1 
B)  more; G2 
C)  more; S 
D)  less; G1 
E)  less; M

Question 10

In mitotic metaphase, there are 16 sister chromatids in a cell.How many centromeres are in the cell?

Accepted Answer

A)  1 
B)  2 
C)  8 
D)  16 
E)  32

Question 11

The process that ensures that only one of each pair of chromosomes is included in a gamete is _______.

Accepted Answer

The answer of The process that ensures that only one...

Question 12

Which feature is not seen in interphase?

Accepted Answer

A)  Active cell metabolism 
B)  Cytokinesis 
C)  DNA replication 
D)  Visible cell nucleus 
E)  All of the above are features of interphase.

Question 13

A triploid nucleus will have difficulty undergoing meiosis because

Accepted Answer

A)  the DNA cannot replicate. 
B)  not all of the chromosomes can form homologous pairs. 
C)  the sister chromatids cannot separate. 
D)  cytokinesis cannot occur. 
E)  a cell plate cannot form.

Question 14

Some people are born with webbed hands that have tissue between the individual digits.The most likely cause of this anomaly is the failure of _______ during fetal development.

Accepted Answer

The answer of Some people are born with webbed hands...

Question 15

Most zygotes are

Accepted Answer

A)  multicellular. 
B)  diploid. 
C)  animals. 
D)  clones. 
E)  gametes.

Question 16

You measure the overall growth of a population of cells in a cell line at a rate of 6 units per day.The rate of cell apoptosis is 4 units per day.The rate of cell division in this population is _______ units per day.

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  10 
E)  24

Question 17

Which situation has the highest potential for causing cancer?

Accepted Answer

A)  A mutation in the p53 protein that causes it to become inactive, and a mutation in the RB protein that renders it overly active 
B)  A mutation in the p53 protein that causes it to become overly active, and a mutation in the RB protein that renders it inactive 
C)  Increased production of normal HER2, and a mutation in the RB protein that renders it inactive 
D)  Increased production of normal HER2, and a mutation in the RB protein that renders it overly active 
E)  Increased production of normal p53 protein, and a mutation in the RB protein that renders it inactive

Question 18

Which statement about plant cytokinesis is true?

Accepted Answer

A)  It begins after telophase ends. 
B)  A division furrow completely separates the cytoplasm. 
C)  It is under the control of Ca2+. 
D)  Vesicles fuse to form a cell plate. 
E)  The spindle fibers break down to form a cell plate.

Question 19

Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases.The key that allows a cell to progress beyond the restriction point is

Accepted Answer

A)  the presence of cyclin. 
B)  the absence of cyclin. 
C)  the presence of cyclin and Cdk. 
D)  phosphorylation of RB by Cdk. 
E)  the presence of external signals from growth factors.

Question 20

A bacterial cell has a mutation in the ter gene.The most likely result would be that

Accepted Answer

A)  the cell could not detect whether conditions were favorable for replication. 
B)  the initiation of DNA replication would be hindered. 
C)  DNA replication would continue past where it was supposed to stop. 
D)  the cell would not be able to segregate DNA molecules. 
E)  the cell could not undergo meiosis.

Exam 11: The Cell Cycle and Cell Division