Question 1

During prophase of mitosis, a diploid cell with 2 nuclear chromosomes has how many sister chromatids and how many contiguous DNA molecules?

Accepted Answer

A)  4 sister chromatids and 4 DNA molecules 
B)  4 sister chromatids and 2 DNA molecules 
C)  2 sister chromatids and 2 DNA molecules 
D)  8 sister chromatids and 4 DNA molecules 
E)  2 sister chromatids and 4 DNA molecules 
A)  4 sister chromatids and 4 DNA molecules 
B)  4 sister chromatids and 2 DNA molecules 
C)  2 sister chromatids and 2 DNA molecules 
D)  8 sister chromatids and 4 DNA molecules 
E)  2 sister chromatids and 4 DNA molecules

Question 2

You discover a new species of snail, Biologica terificia, and find that its haploid number is 4 (n = 4). The somatic cells of Biologica terificia are diploid. How many chromosomes are in a somatic cell of the snail in G1 phase?

Accepted Answer

A)  4 
B)  16 
C)  8 
D)  too many to count 
A)  4 
B)  16 
C)  8 
D)  too many to count

Question 3

What is the difference between cytokinesis and karyokinesis? Which process needs to be more precise for accurate cell division?

Accepted Answer

Karyokinesis is the equal partitioning o

Question 4

In meiosis, interphase is followed by two successive rounds of cell division, meiosis I and
II. Meiosis results in four haploid daughter cells because__________ does not occur between the end of telophase I and the start of prophase II.

Accepted Answer

DNA replic

Question 5

At the end of meiosis II, what is produced?

Accepted Answer

four haplo

Question 6

During prometaphase, microtubules grow from the _______to attach to the ________.

Accepted Answer

A)  Nucleolus; Chromosomes 
B)  Centrioles; Organelles 
C)  Metaphase plate; Daughter chromosomes 
D)  Centrosomes; Kinetochores 
E)  Spindle; Chromatids 
A)  Nucleolus; Chromosomes 
B)  Centrioles; Organelles 
C)  Metaphase plate; Daughter chromosomes 
D)  Centrosomes; Kinetochores 
E)  Spindle; Chromatids

Question 7

Certain kinds of cells (e.g., some cells in the eyes and bones) mature and differentiate into a state in which they have a specialized function but do not divide or progress through the cell cycle. These cells are "stuck" in which stage?

Accepted Answer

A)  G0 
B)  S 
C)  G1 
D)  M phase 
E)  G2 
A)  G0 
B)  S 
C)  G1 
D)  M phase 
E)  G2

Question 8

Vinblastine is a commonly used chemotherapy drug that acts by interfering with the assembly of microtubules. How does it likely target cancer cells?

Accepted Answer

A)  by inhibiting DNA synthesis 
B)  by disrupting mitotic spindle formation 
C)  by inhibiting protein kinases 
D)  by denaturing myosin and preventing the cleavage furrow from forming 
E)  by suppressing cyclins 
A)  by inhibiting DNA synthesis 
B)  by disrupting mitotic spindle formation 
C)  by inhibiting protein kinases 
D)  by denaturing myosin and preventing the cleavage furrow from forming 
E)  by suppressing cyclins

Question 9

Females have two copies of the X chromosome, so they can be homozygous or heterozygous for any genes found on the X chromosome. Males have only one copy of the X chromosome. What term is used to describe this inheritance state?

Accepted Answer

The answer of Females have two copies of the X...

Question 10

Which term describes any mechanism that compensates for differences in the number of copies of genes due to the different chromosome constitutions of males and females?

Accepted Answer

The answer of Which term describes any mechanism that compensates...

Question 11

Which structure is responsible for chromosome movement during cell division?

Accepted Answer

A)  kinetochore microtubules 
B)  nuclear envelope 
C)  synaptonemal complex 
D)  cell membrane 
E)  metaphase plate 
A)  kinetochore microtubules 
B)  nuclear envelope 
C)  synaptonemal complex 
D)  cell membrane 
E)  metaphase plate

Question 12

The gametes of the two sexes are often dramatically different in size and morphology. If both gametes have a haploid nucleus, then what do female gametes contain more of?

Accepted Answer

cytoplasm

Question 13

When cyclin D1 is expressed in normal levels, it stimulates the cell cycle by promoting transition from one cell cycle phase to another. If overexpressed, it can promote cancer by allowing cells to overproliferate. The normal cyclin D1 gene regulates which general cell cycle process?

Accepted Answer

cell cycle

Question 14

Tumor suppressors are genes whose protein products regulate cell cycle checkpoints and________ .

Accepted Answer

A)  promote advancement of the cell cycle 
B)  activate proto- oncogenes 
C)  block progression of the cell cycle 
D)  prevent apoptosis in normal cells 
E)  phosphorylate proteins involved in the cell cycle 
A)  promote advancement of the cell cycle 
B)  activate proto- oncogenes 
C)  block progression of the cell cycle 
D)  prevent apoptosis in normal cells 
E)  phosphorylate proteins involved in the cell cycle

Question 15

The binding of nonsister chromatids by a synaptonemal complex draws the homologs into close contact so that what process can occur?

Accepted Answer

A)  synapsis 
B)  karyokinesis 
C)  disjunction 
D)  independent assortment 
E)  cytokinesis 
A)  synapsis 
B)  karyokinesis 
C)  disjunction 
D)  independent assortment 
E)  cytokinesis

Question 16

Synapsis initiates formation of a protein bridge called the synaptonemal complex, a tri- layer protein structure that maintains synapsis by tightly binding nonsister chromatids of ___________ to one another.

Accepted Answer

homologous

Question 17

If a cell begins to divide rapidly (as often seen in wound repair), what would you expect to happen to the timing of G1 phase?

Accepted Answer

A)  It would require less time than other cells. 
B)  It would require more time than other cells. 
C)  The time it would require would depend on what other cells in the vicinity are doing. 
D)  It would require the same amount of time as any other cell. 
E)  It is not possible to say what would happen to the timing of G1 phase. 
A)  It would require less time than other cells. 
B)  It would require more time than other cells. 
C)  The time it would require would depend on what other cells in the vicinity are doing. 
D)  It would require the same amount of time as any other cell. 
E)  It is not possible to say what would happen to the timing of G1 phase.

Question 18

During mitotic cell division, if chromosomal material is improperly divided between the two daughter cells, one cell could receive three copies of a chromosome, and the other cell could receive only one. This is likely due to a defect in which process?

Accepted Answer

A)  crossing over 
B)  cytokinesis 
C)  homologous recombination 
D)  karyokinesis 
E)  synapsis 
A)  crossing over 
B)  cytokinesis 
C)  homologous recombination 
D)  karyokinesis 
E)  synapsis

Question 19

Which meiotic division(s) reduce(s) chromosome number (i.e., meiosis I, meiosis II, or both)? Explain your answer.

Accepted Answer

Meiosis I reduces chromosome n

Question 20

A single chromosome at metaphase contains how many DNA molecules?

Accepted Answer

A)  two 
B)  four 
C)  one 
D)  more than four 
E)  impossible to determine 
A)  two 
B)  four 
C)  one 
D)  more than four 
E)  impossible to determine

Exam 3: Cell Division and Chromosome Heredity

During prophase of mitosis, a diploid cell with 2 nuclear chromosomes has how many sister chromatids and how many contiguous DNA molecules?

You discover a new species of snail, Biologica terificia, and find that its haploid number is 4 (n = 4). The somatic cells of Biologica terificia are diploid. How many chromosomes are in a somatic cell of the snail in G1 phase?

What is the difference between cytokinesis and karyokinesis? Which process needs to be more precise for accurate cell division?

In meiosis, interphase is followed by two successive rounds of cell division, meiosis I and II. Meiosis results in four haploid daughter cells because__________ does not occur between the end of telophase I and the start of prophase II.

At the end of meiosis II, what is produced?

During prometaphase, microtubules grow from the _______to attach to the ________.

Certain kinds of cells (e.g., some cells in the eyes and bones) mature and differentiate into a state in which they have a specialized function but do not divide or progress through the cell cycle. These cells are "stuck" in which stage?

Vinblastine is a commonly used chemotherapy drug that acts by interfering with the assembly of microtubules. How does it likely target cancer cells?

Females have two copies of the X chromosome, so they can be homozygous or heterozygous for any genes found on the X chromosome. Males have only one copy of the X chromosome. What term is used to describe this inheritance state?

Which term describes any mechanism that compensates for differences in the number of copies of genes due to the different chromosome constitutions of males and females?

Which structure is responsible for chromosome movement during cell division?

The gametes of the two sexes are often dramatically different in size and morphology. If both gametes have a haploid nucleus, then what do female gametes contain more of?

When cyclin D1 is expressed in normal levels, it stimulates the cell cycle by promoting transition from one cell cycle phase to another. If overexpressed, it can promote cancer by allowing cells to overproliferate. The normal cyclin D1 gene regulates which general cell cycle process?

Tumor suppressors are genes whose protein products regulate cell cycle checkpoints and________ .

The binding of nonsister chromatids by a synaptonemal complex draws the homologs into close contact so that what process can occur?

Synapsis initiates formation of a protein bridge called the synaptonemal complex, a tri- layer protein structure that maintains synapsis by tightly binding nonsister chromatids of ___________ to one another.

If a cell begins to divide rapidly (as often seen in wound repair), what would you expect to happen to the timing of G1 phase?

During mitotic cell division, if chromosomal material is improperly divided between the two daughter cells, one cell could receive three copies of a chromosome, and the other cell could receive only one. This is likely due to a defect in which process?

Which meiotic division(s) reduce(s) chromosome number (i.e., meiosis I, meiosis II, or both)? Explain your answer.

A single chromosome at metaphase contains how many DNA molecules?

The Molecular Basis of Heredity, Variation, and Evolution

Transmission Genetics

Inheritance Patterns of Single Genes and Gene Interaction

Genetic Linkage and Mapping in Eukaryotes

Genetic Analysis and Mapping in Bacteria and Bacteriophage

Dna Structure and Replication

Molecular Biology of Transcription and Rna Processing

The Molecular Biology of Translation

Chromosome Chapter Title Tbd

Gene Mutation, Dna Repair, and Homologous Recombination

Chromosome Chapter Title Tbd

Regulation of Gene Expression in Bacteria and Bacteriophage

Regulation of Gene Expression in Eukaryotes

Analysis of Gene Function by Forward Genetics and Reverse Genetics

Recombinant Dna Technology and Its Applications

Genomics: Genetics From a Whole-Genome Perspective

Organelle Inheritance and the Evolution of Organelle Genomes

Developmental Genetics

Genetic Analysis of Quantitative Traits

Population Genetics and Evolution at the Population, Species, and Molecular Levels

Filters

During prometaphase, microtubules grow from the _to attach to the __.