Question 1

What is the overall purpose of mitosis? Of meiosis?

Accepted Answer

The purpose of mitosis is to p

Question 2

A cell in G2 contains 36 sister chromatids.This same cell in G1 would have

Accepted Answer

A)  18 chromosomes. 
B)  36 chromosomes. 
C)  18 sister chromatids. 
D)  36 sister chromatids. 
E)  72 sister chromatids. 
A)  18 chromosomes. 
B)  36 chromosomes. 
C)  18 sister chromatids. 
D)  36 sister chromatids. 
E)  72 sister chromatids.

Question 3

Which event in prokaryotes is most like the segregation of sister chromatids in eukaryotic mitosis?

Accepted Answer

A)  Ori regions moving toward opposite ends of the cell 
B)  Replication beginning at the ori site 
C)  Replication ending at the ter site 
D)  The plasma membrane pinching in to form a ring of fibers similar to a purse string 
E)  Formation of a cell wall 
A)  Ori regions moving toward opposite ends of the cell 
B)  Replication beginning at the ori site 
C)  Replication ending at the ter site 
D)  The plasma membrane pinching in to form a ring of fibers similar to a purse string 
E)  Formation of a cell wall

Question 4

After a DNA molecule of a eukaryotic chromosome doubles, it is then made up of two joined _______.

Accepted Answer

The answer of After a DNA molecule of a eukaryotic...

Question 5

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

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  23 
E)  46 
A)  1 
B)  2 
C)  4 
D)  23 
E)  46

Question 6

Refer to the figure showing the eukaryotic cell cycle.   At what point is the cell cycle likely to be the most difficult to reverse or to stop?

Accepted Answer

A)  Early in G1 phase, before the restriction point (R) 
B)  Late in G1 phase, after the restriction point (R) 
C)  During S phase 
D)  Early in G2 phase 
E)  Late in G2 phase 
A)  Early in G1 phase, before the restriction point (R) 
B)  Late in G1 phase, after the restriction point (R) 
C)  During S phase 
D)  Early in G2 phase 
E)  Late in G2 phase

Question 7

The total DNA content of each daughter cell is reduced during meiosis because

Accepted Answer

A)  chromosomes do not replicate during the interphase preceding meiosis I. 
B)  chromosomes do not replicate between meiosis I and II. 
C)  half of the chromosomes from each gamete are lost during fertilization. 
D)  sister chromatids separate during anaphase of meiosis I. 
E)  chromosome arms are lost during crossing over. 
A)  chromosomes do not replicate during the interphase preceding meiosis I. 
B)  chromosomes do not replicate between meiosis I and II. 
C)  half of the chromosomes from each gamete are lost during fertilization. 
D)  sister chromatids separate during anaphase of meiosis I. 
E)  chromosome arms are lost during crossing over.

Question 8

The initiation of both the S phase and the M phase of the cell cycle depends on pairs of molecules called _______ and _______.

Accepted Answer

A)  actin; myosin 
B)  Cdk; cyclin 
C)  ligand; receptor 
D)  maturation promoting factor; growth factor 
E)  ATP; ATPase 
A)  actin; myosin 
B)  Cdk; cyclin 
C)  ligand; receptor 
D)  maturation promoting factor; growth factor 
E)  ATP; ATPase

Question 9

The milestone event that defines entry into prometaphase is loss of the _______.

Accepted Answer

The answer of The milestone event that defines entry into...

Question 10

The fact that most monosomies and trisomies are lethal to human embryos illustrates the

Accepted Answer

A)  importance of the orderly distribution of genetic material during meiosis. 
B)  exchange of genetic information during crossing over. 
C)  advantage of sexual reproduction to the survival of a population. 
D)  fact that each chromosome contains a single molecule of DNA. 
E)  formation of haploid gametes as a result of meiosis. 
A)  importance of the orderly distribution of genetic material during meiosis. 
B)  exchange of genetic information during crossing over. 
C)  advantage of sexual reproduction to the survival of a population. 
D)  fact that each chromosome contains a single molecule of DNA. 
E)  formation of haploid gametes as a result of meiosis.

Question 11

A eukaryotic organism has a mutation that causes it to produce more p21 protein.Which is the most likely result of the mutation?

Accepted Answer

A)  If the organism receives radiation, cell division will be slowed more than it would in an organism with normal levels of p21. 
B)  Cells with radiation-induced DNA damage will continue through the cell cycle without repairing the damaged DNA. 
C)  Cells with incomplete DNA replication will continue through the checkpoint. 
D)  Cells will not respond to growth factors. 
E)  Cells will respond too readily to growth factors. 
A)  If the organism receives radiation, cell division will be slowed more than it would in an organism with normal levels of p21. 
B)  Cells with radiation-induced DNA damage will continue through the cell cycle without repairing the damaged DNA. 
C)  Cells with incomplete DNA replication will continue through the checkpoint. 
D)  Cells will not respond to growth factors. 
E)  Cells will respond too readily to growth factors.

Question 12

Replacing a neutral amino acid in a histone with arginine would make the histone more positively charged and _______ (more/less) likely to bind to DNA.

Accepted Answer

The answer of Replacing a neutral amino acid in a...

Question 13

Organisms that are haplontic differ from those that are diplontic in

Accepted Answer

A)  whether their cell cycles contain checkpoints. 
B)  the number of chromosomes they contain. 
C)  the extent to which they develop in the diploid state during their life cycle. 
D)  whether they undergo meiosis. 
E)  None of the above 
A)  whether their cell cycles contain checkpoints. 
B)  the number of chromosomes they contain. 
C)  the extent to which they develop in the diploid state during their life cycle. 
D)  whether they undergo meiosis. 
E)  None of the above

Question 14

The diploid number of a species of conifer is 64.How many chromosomes would a monosomic individual have?

Accepted Answer

A)  31 
B)  32 
C)  63 
D)  64 
E)  65 
A)  31 
B)  32 
C)  63 
D)  64 
E)  65

Question 15

In plants, a(n) _______ forms at the equatorial region of a dividing cell.

Accepted Answer

The answer of In plants, a(n) _______ forms at the...

Question 16

Chromosomes decondense into diffuse chromatin

Accepted Answer

A)  at the end of telophase. 
B)  at the beginning of prophase. 
C)  at the end of interphase. 
D)  at the end of metaphase. 
E)  only in dying cells. 
A)  at the end of telophase. 
B)  at the beginning of prophase. 
C)  at the end of interphase. 
D)  at the end of metaphase. 
E)  only in dying cells.

Question 17

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

Accepted Answer

A)  p21. 
B)  HER2. 
C)  Cdk. 
D)  cyclin. 
E)  RB. 
A)  p21. 
B)  HER2. 
C)  Cdk. 
D)  cyclin. 
E)  RB.

Question 18

Both 5-fluorouracil and paclitaxel inhibit _______, the former by _______ and the latter by blocking _______.

Accepted Answer

A)  apoptosis; damaging DNA; cytokinesis 
B)  the cell cycle; blocking the synthesis of thymine; spindle formation 
C)  apoptosis; blocking DNA replication; spindle formation 
D)  the cell cycle; damaging DNA; cytokinesis 
E)  the cell cycle; blocking DNA replication; cytokinesis 
A)  apoptosis; damaging DNA; cytokinesis 
B)  the cell cycle; blocking the synthesis of thymine; spindle formation 
C)  apoptosis; blocking DNA replication; spindle formation 
D)  the cell cycle; damaging DNA; cytokinesis 
E)  the cell cycle; blocking DNA replication; cytokinesis

Question 19

The haploid number of a species of tuna is 28.A monosomic individual would therefore have _______ chromosomes.

Accepted Answer

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

Question 20

Interleukins and erythropoietin are

Accepted Answer

A)  intracellular signaling molecules. 
B)  Cdk's. 
C)  cyclins. 
D)  antitumor agents. 
E)  growth factors. 
A)  intracellular signaling molecules. 
B)  Cdk's. 
C)  cyclins. 
D)  antitumor agents. 
E)  growth factors.

Exam 11: The Cell Cycle and Cell Division

What is the overall purpose of mitosis? Of meiosis?

A cell in G2 contains 36 sister chromatids.This same cell in G1 would have

Which event in prokaryotes is most like the segregation of sister chromatids in eukaryotic mitosis?

After a DNA molecule of a eukaryotic chromosome doubles, it is then made up of two joined _______.

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

Refer to the figure showing the eukaryotic cell cycle. At what point is the cell cycle likely to be the most difficult to reverse or to stop?

The total DNA content of each daughter cell is reduced during meiosis because

The initiation of both the S phase and the M phase of the cell cycle depends on pairs of molecules called _______ and _______.

The milestone event that defines entry into prometaphase is loss of the _______.

The fact that most monosomies and trisomies are lethal to human embryos illustrates the

A eukaryotic organism has a mutation that causes it to produce more p21 protein.Which is the most likely result of the mutation?

Replacing a neutral amino acid in a histone with arginine would make the histone more positively charged and _______ (more/less) likely to bind to DNA.

Organisms that are haplontic differ from those that are diplontic in

The diploid number of a species of conifer is 64.How many chromosomes would a monosomic individual have?

In plants, a(n) _______ forms at the equatorial region of a dividing cell.

Chromosomes decondense into diffuse chromatin

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

Both 5-fluorouracil and paclitaxel inhibit _______, the former by _______ and the latter by blocking _______.

The haploid number of a species of tuna is 28.A monosomic individual would therefore have _______ chromosomes.

Interleukins and erythropoietin are

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Communication and Multicellularity

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

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Mechanisms of Evolution

Reconstructing and Using Phylogenies

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Evolution of Genes and Genomes

The History of Life on Earth

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The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

The Evolution and Diversity of Fungi

Animal Origins and the Evolution of Body Plans

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The initiation of both the S phase and the M phase of the cell cycle depends on pairs of molecules called _ and _.

Both 5-fluorouracil and paclitaxel inhibit ___, the former by _ and the latter by blocking _____.