Question 1

The "invisible thread" that pinches animal cells apart during cell division is made of _______ and _______.

Accepted Answer

The answer of The "invisible thread" that pinches animal cells...

Question 2

Chromatin condenses to form discrete, visible chromosomes

Accepted Answer

A)  early in G1. 
B)  during S. 
C)  during telophase. 
D)  during prophase. 
E)  at the end of cytokinesis. 
A)  early in G1. 
B)  during S. 
C)  during telophase. 
D)  during prophase. 
E)  at the end of cytokinesis.

Question 3

Which of the following statements about plant cytokinesis is true?

Accepted Answer

A)  It begins when 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. 
A)  It begins when 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 4

The main role of nucleosomes in eukaryotic cells is to _______ the DNA.

Accepted Answer

The answer of The main role of nucleosomes in eukaryotic...

Question 5

One-fourth of all human breast cancers have been found to have an increased amount of the oncogene

Accepted Answer

A)  P21. 
B)  HER2. 
C)  Cdk. 
D)  Cyclin. 
E)  RB. 
A)  P21. 
B)  HER2. 
C)  Cdk. 
D)  Cyclin. 
E)  RB.

Question 6

The cell plate is derived from the _______ of the cell.

Accepted Answer

The answer of The cell plate is derived from the...

Question 7

A triploid nucleus cannot undergo 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. 
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 8

During prophase I of meiosis, a unique event called _______ results in the formation of recombinant chromosomes.

Accepted Answer

The answer of During prophase I of meiosis, a unique...

Question 9

The DNA of a eukaryotic cell is

Accepted Answer

A)  double-stranded. 
B)  single-stranded. 
C)  circular. 
D)  complex inverted. 
E)  conservative. 
A)  double-stranded. 
B)  single-stranded. 
C)  circular. 
D)  complex inverted. 
E)  conservative.

Question 10

Which of the following is not involved in the separation of paired chromatids and their movement to opposite poles?

Accepted Answer

A)  Sister chromatids attach to microtubules in opposite halves of the spindle. 
B)  Separase hydrolyzes cohesion, allowing chromatid separation. 
C)  Tubulin fibers move the chromatids away from the equatorial plate. 
D)  Polar microtubules push the chromatids to the poles. 
E)  ATP is hydrolyzed by cytoplasmic dynein. 
A)  Sister chromatids attach to microtubules in opposite halves of the spindle. 
B)  Separase hydrolyzes cohesion, allowing chromatid separation. 
C)  Tubulin fibers move the chromatids away from the equatorial plate. 
D)  Polar microtubules push the chromatids to the poles. 
E)  ATP is hydrolyzed by cytoplasmic dynein.

Question 11

If the ori site on the E. coli chromosome is deleted,

Accepted Answer

A)  nothing will happen. 
B)  replication will start but not be able to continue. 
C)  replication will not start. 
D)  replication will initiate at another ori site on the chromosome. 
E)  the chromosome will be replicated but the cell will not be able to divide. 
A)  nothing will happen. 
B)  replication will start but not be able to continue. 
C)  replication will not start. 
D)  replication will initiate at another ori site on the chromosome. 
E)  the chromosome will be replicated but the cell will not be able to divide.

Question 12

The members of a homologous pair of chromosomes

Accepted Answer

A)  are identical in size and appearance. 
B)  contain identical genetic information. 
C)  separate to opposite poles of the cell during mitosis. 
D)  are found only in haploid cells. 
E)  are present only after the S phase. 
A)  are identical in size and appearance. 
B)  contain identical genetic information. 
C)  separate to opposite poles of the cell during mitosis. 
D)  are found only in haploid cells. 
E)  are present only after the S phase.

Question 13

In human cells, chromosomes are

Accepted Answer

A)  always condensed during the entire cell cycle. 
B)  different in different tissues. 
C)  connected by centromeres, except for the X and Y. 
D)  the same size and length. 
E)  visible only during mitosis and meiosis. 
A)  always condensed during the entire cell cycle. 
B)  different in different tissues. 
C)  connected by centromeres, except for the X and Y. 
D)  the same size and length. 
E)  visible only during mitosis and meiosis.

Question 14

How does cytokinesis differ in animal and plant cells?

Accepted Answer

In animal cells, cytokinesis results fro

Question 15

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

Accepted Answer

A)  Cdk1 and cyclin B. 
B)  cyclin D and p21. 
C)  cyclin A and Cdk2. 
D)  phosphorylation of RB by Cdk4 and Cdk2. 
E)  external signals from growth factors. 
A)  Cdk1 and cyclin B. 
B)  cyclin D and p21. 
C)  cyclin A and Cdk2. 
D)  phosphorylation of RB by Cdk4 and Cdk2. 
E)  external signals from growth factors.

Question 16

Which stage of mitosis includes the formation of kinetochores?

Accepted Answer

A)  Metaphase 
B)  Anaphase 
C)  Telophase 
D)  Prophase 
E)  Interphase 
A)  Metaphase 
B)  Anaphase 
C)  Telophase 
D)  Prophase 
E)  Interphase

Question 17

Each diploid cell of a human female contains _______ of each type of chromosome.

Accepted Answer

A)  one 
B)  two 
C)  four 
D)  a total of 23 
E)  a total of 46 
A)  one 
B)  two 
C)  four 
D)  a total of 23 
E)  a total of 46

Question 18

A mechanism for increasing the genetic diversity of offspring is

Accepted Answer

A)  mitosis. 
B)  cloning. 
C)  sexual reproduction. 
D)  cytokinesis. 
E)  fission. 
A)  mitosis. 
B)  cloning. 
C)  sexual reproduction. 
D)  cytokinesis. 
E)  fission.

Question 19

The sizes and shapes of chromosomes can be observed most easily in a cell that is in

Accepted Answer

A)  prophase. 
B)  metaphase. 
C)  anaphase. 
D)  telophase. 
E)  cytokinesis. 
A)  prophase. 
B)  metaphase. 
C)  anaphase. 
D)  telophase. 
E)  cytokinesis.

Question 20

During asexual reproduction, the genetic material of the parent is passed on to the offspring by

Accepted Answer

A)  homologous pairing. 
B)  meiosis and fertilization. 
C)  mitosis and cytokinesis. 
D)  karyotyping. 
E)  chiasmata. 
A)  homologous pairing. 
B)  meiosis and fertilization. 
C)  mitosis and cytokinesis. 
D)  karyotyping. 
E)  chiasmata.

Exam 11: The Cell Cycle and Cell Division

The "invisible thread" that pinches animal cells apart during cell division is made of _______ and _______.

Chromatin condenses to form discrete, visible chromosomes

Which of the following statements about plant cytokinesis is true?

The main role of nucleosomes in eukaryotic cells is to _______ the DNA.

One-fourth of all human breast cancers have been found to have an increased amount of the oncogene

The cell plate is derived from the _______ of the cell.

A triploid nucleus cannot undergo meiosis because

During prophase I of meiosis, a unique event called _______ results in the formation of recombinant chromosomes.

The DNA of a eukaryotic cell is

Which of the following is not involved in the separation of paired chromatids and their movement to opposite poles?

If the ori site on the E. coli chromosome is deleted,

The members of a homologous pair of chromosomes

In human cells, chromosomes are

How does cytokinesis differ in animal and plant cells?

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

Which stage of mitosis includes the formation of kinetochores?

Each diploid cell of a human female contains _______ of each type of chromosome.

A mechanism for increasing the genetic diversity of offspring is

The sizes and shapes of chromosomes can be observed most easily in a cell that is in

During asexual reproduction, the genetic material of the parent is passed on to the offspring by

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The "invisible thread" that pinches animal cells apart during cell division is made of _ and _.