Question 1

In which stage of the cell cycle does most DNA replication occur in eukaryotes?

Accepted Answer

A)  G1
B)  G2
C)  S
D)  Prophase of mitosis
E)  G0

Question 2

A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42) .As in humans, sex chromosomes determine sex: XX in females and XY in males.What is the total number of telomeres in a rat cell in G2?

Accepted Answer

A)  21
B)  42
C)  84
D)  126
E)  168

Question 3

Microscopy to look at a cell's chromosomes is often done when the cell is in mitotic metaphase.For example, karyotypes that extract chromosomes from a single cell and photograph them to look for abnormalities are done on metaphase, rather than interphase, cells.Why?

Accepted Answer

In metaphase, chromo...

Question 4

(a)Describe the changing role of cohesin during the mitotic cell cycle.(b)Explain the importance of regulation of cohesin activity to normal cell division.

Accepted Answer

(a)Cohesin keeps sister chromatids toget...

Question 5

Which of the following statements is FALSE?

Accepted Answer

A)  Generally, chromosomes of prokaryotes are circular.
B)  Prokaryotes usually have a single molecule of DNA.
C)  Generally, chromosomes of eukaryotes are circular.
D)  Eukaryotes usually have multiple chromosomes.
E)  Eukaryote chromosomes are usually linear.

Question 6

Which of the following occurs during prometaphase?

Accepted Answer

A)  The chromosomes align in a single plane.
B)  DNA is replicated.
C)  Microtubules attach to the kinetochores.
D)  Mitotic spindles form.
E)  The two sister chromatids separate.

Question 7

Prokaryotic chromosomes do NOT have telomeres because they:

Accepted Answer

A)  do not go through mitosis.
B)  do not go through DNA replication.
C)  are in the cytoplasm.
D)  are circular.
E)  have no centromeres.

Question 8

The attachment point on the chromosome for spindle microtubules is the:

Accepted Answer

A)  telomere.
B)  centromere.
C)  origin of replication.
D)  sister chromatid.
E)  allele.

Question 9

In eukaryotes, chromosomes do NOT contain:

Accepted Answer

A)  ribosomes.
B)  chromatin.
C)  proteins.
D)  histones.
E)  DNA.

Question 10

In a flowering plant, the male part of the flower (the stamen) produces haploid microspores that divide by _____ to produce sperm.

Accepted Answer

A)  mitosis
B)  meiosis
C)  gametogenesis
D)  spermatogenesis
E)  fertilization A

Question 11

The normal function of shugoshin during meiosis involves:

Accepted Answer

A)  attaching spindle fibers to the kinetochores.
B)  holding homologous chromosomes together until they separate at anaphase I.
C)  keeping cohesin from being broken down in the centromere regions.
D)  holding sister chromatids together until they separate at anaphase I.
E)  allowing crossing over to only occur at specific chromosomal regions.

Question 12

Which of the following pairs are BOTH prokaryotes?

Accepted Answer

A)  Eubacteria and higher plants
B)  Archaea and eubacteria
C)  Higher animals and archaea
D)  Viruses and higher animals
E)  Humans and eubacteria B

Question 13

In a higher animal, how many secondary oocytes could be produced from 20 primary oocytes?

Accepted Answer

A)  5
B)  10
C)  20
D)  40
E)  80

Question 14

During anaphase of mitosis, which of the following occurs?

Accepted Answer

A)  Sister chromatids separate from each other.
B)  Homologous chromosomes separate from each other.
C)  The spindle-assembly checkpoint insures that each chromosome is properly aligned.
D)  The condensed chromosomes relax.
E)  Spindle microtubules anchor to kinetochores.

Question 15

Diploid cells are cells with _____ chromosomes.

Accepted Answer

A)  a single set of
B)  circular
C)  two sets of
D)  many sets of
E)  three sets of

Question 16

Pea plants have seven different pairs of chromosomes.The nucleus of a megaspore in a pea ovary would contain how many chromosomes?

Accepted Answer

A)  3 
B)  7
C)  14
D)  21
E)  30

Question 17

Which of the following statements is FALSE?

Accepted Answer

A)  Errors in chromosome separation are rarely a problem for an organism.
B)  Errors in chromosome separation can result in a miscarriage.
C)  Errors in chromosome separation can result in cancer.
D)  Errors in chromosome separation can result in a child with severe handicaps.
E)  Errors in chromosome separation can cause numerous problems for an organism. A

Question 18

The figure shows chromosomal separation taking place.The letters stand for genes; capital and lowercase stand for different alleles.The diploid chromosome number in this organism is four.What process is shown?

Accepted Answer

A)  Anaphase of mitosis
B)  Telophase of meiosis I
C)  Anaphase of meiosis I
D)  Telophase of mitosis
E)  Anaphase of meiosis II

Question 19

A pollen grain that lands on a stigma grows a pollen tube to deliver _____ (how many?) sperm to the ovary.Fusion of a sperm with an egg produces a _____ n cell, called a _____.

Accepted Answer

A)  one; 1; zygote
B)  two; 1; megasporocyte
C)  two; 2; zygote
D)  one; 2; microsporocyte
E)  one; 2; megasporocyte

Question 20

The process of splitting the cytoplasm, which separates one cell into two, is termed:

Accepted Answer

A)  cytokinesis.
B)  mitosis.
C)  anaphase.
D)  diakinesis.
E)  fusion.

Exam 2: Chromosomes and Cellular Reproduction

In which stage of the cell cycle does most DNA replication occur in eukaryotes?

Correct AnswerverifiedShow Answer

A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42) .As in humans, sex chromosomes determine sex: XX in females and XY in males.What is the total number of telomeres in a rat cell in G2?

Correct AnswerverifiedShow Answer

Microscopy to look at a cell's chromosomes is often done when the cell is in mitotic metaphase.For example, karyotypes that extract chromosomes from a single cell and photograph them to look for abnormalities are done on metaphase, rather than interphase, cells.Why?

Correct AnswerverifiedIn metaphase, chromo...View AnswerShow Answer

(a)Describe the changing role of cohesin during the mitotic cell cycle.(b)Explain the importance of regulation of cohesin activity to normal cell division.

Correct Answerverified(a)Cohesin keeps sister chromatids toget...View AnswerShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

Which of the following occurs during prometaphase?

Correct AnswerverifiedShow Answer

Prokaryotic chromosomes do NOT have telomeres because they:

Correct AnswerverifiedShow Answer

The attachment point on the chromosome for spindle microtubules is the:

Correct AnswerverifiedShow Answer

In eukaryotes, chromosomes do NOT contain:

Correct AnswerverifiedShow Answer

In a flowering plant, the male part of the flower (the stamen) produces haploid microspores that divide by _____ to produce sperm.

Correct AnswerverifiedA

The normal function of shugoshin during meiosis involves:

Correct AnswerverifiedShow Answer

Which of the following pairs are BOTH prokaryotes?

Correct AnswerverifiedB

In a higher animal, how many secondary oocytes could be produced from 20 primary oocytes?

Correct AnswerverifiedShow Answer

During anaphase of mitosis, which of the following occurs?

Correct AnswerverifiedShow Answer

Diploid cells are cells with _____ chromosomes.

Correct AnswerverifiedShow Answer

Pea plants have seven different pairs of chromosomes.The nucleus of a megaspore in a pea ovary would contain how many chromosomes?

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedA

The figure shows chromosomal separation taking place.The letters stand for genes; capital and lowercase stand for different alleles.The diploid chromosome number in this organism is four.What process is shown?

Correct AnswerverifiedShow Answer

A pollen grain that lands on a stigma grows a pollen tube to deliver _____ (how many?) sperm to the ovary.Fusion of a sperm with an egg produces a _____ n cell, called a _____.

Correct AnswerverifiedShow Answer

The process of splitting the cytoplasm, which separates one cell into two, is termed:

Correct AnswerverifiedShow Answer

Correct Answer
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A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42) .As in humans, sex chromosomes determine sex: XX in females and XY in males.What is the total number of telomeres in a rat cell in G₂?

Correct Answer
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In metaphase, chromo...
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(a)Cohesin keeps sister chromatids toget...
View Answer

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A

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B

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A

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A pollen grain that lands on a stigma grows a pollen tube to deliver ___ (how many?) sperm to the ovary.Fusion of a sperm with an egg produces a _ n cell, called a ___.

Correct Answer
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Correct Answer
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