Question 1

You are examining a cell under the microscope and see what appear to be four sister chromatids bound together and remnants of the nuclear envelope.What stage of meiosis are you looking at?

Accepted Answer

A)  prophase I
B)  prophase II
C)  metaphase I
D)  metaphase II
E)  telophase IF) C) and D)
G) None of the above

Question 2

Would it be possible to observe crossing-over between sister chromatids? Why or why not?

Accepted Answer

A)  No.Crossing-over is not observable.
B)  No.Sister chromatids are not present within the same nucleus.
C)  No,since crossing-over does not occur between sister chromatids.
D)  Yes.Sister chromatids look different from each other.
E)  Yes.One sister chromatid comes from mother and one comes from father.F) B) and E)
G) A) and E)

Question 3

Without considering the variation provided by crossing-over,how much will two siblings from one set of parents vary from each other?

Accepted Answer

A)  All siblings from the same parents are identical to each other and demonstrate traits that are exactly halfway between their parents' traits.
B)  Siblings receive 100% of one parent's genes or the other parent's genes so they will either be identical if they receive the same parent's genes,or nothing alike if they receive different parent's genes.
C)  Siblings inherit essentially 50% of their genes from each parent,but two sibling offspring may share with each other from zero to 23 chromosomes in common from each parent and therefore vary widely from each other.
D)  Siblings inherit copies of the same 23 pair of chromosomes from each parent and only crossing-over provides any differences between siblings.
E)  There is one chance in 23 of getting identical sets of chromosomes from one parent,times two because there are two parents; therefore two siblings out of 46 will be identical except for the extent of crossing-over.F) A) and B)
G) C) and D)

Question 4

Replication of the DNA for meiosis occurs between telophase I and prophase II.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following best describes the role of histones?

Accepted Answer

A)  Histones play a role in coding for hereditary features.
B)  Histones make RNA synthesis possible.
C)  Histones determine the structure of the chromosome.
D)  Histones are not thought to play any role in the cell.
E)  Histones determine the diploid number of chromosomes.F) A) and C)
G) A) and E)

Question 6

Which of the following events would be controlled by an external signal?

Accepted Answer

A)  cell division
B)  Prophase proceeds into metaphase.
C)  The chromosomes align at the equatorial plane before the cell begins anaphase.
D)  All of the DNA is copied before the cell enters into the G2 phase.
E)  All of the answer choices are controlled by an external signal.F) A) and C)
G) C) and D)

Question 7

What forms the contractile ring in animal cells?

Accepted Answer

A)  membrane vesicles
B)  actin filaments
C)  cellulose fibrils
D)  cell wall
E)  histonesF) A) and B)
G) B) and E)

Question 8

You are examining a cell under the microscope that is undergoing cell division and cannot find any asters.What else would not be present in this cell?

Accepted Answer

A)  a cell plate
B)  centrosomes
C)  a spindle
D)  a cleavage furrow
E)  chromosomesF) A) and B)
G) None of the above

Question 9

In humans,the diploid number of chromosomes is

Accepted Answer

A)  20.
B)  46.
C)  23.
D)  variable depending on whether male or female.
E)  92.F) B) and C)
G) A) and E)

Question 10

If a crayfish has 200 total chromosomes in its body cells (not ovaries or testes) ,

Accepted Answer

A)  any 100 could have been from its father and any 100 from its mother.
B)  they would consist of 100 pairs with one of each pair from the father,one of each pair from the mother.
C)  as many as none to 200 came from the father and conversely,from 200 to none would have come from the mother.
D)  50 pairs or 100 total would come from the father and 50 pairs from the mother.
E)  all 200 come from the mother in a female crayfish,all 200 from the father in a male crayfish.F) None of the above
G) B) and C)

Question 11

During which phases of the cell cycle do the chromosomes look like Xs?

Accepted Answer

A)  prophase,anaphase
B)  anaphase,metaphase
C)  metaphase,telophase
D)  prophase,metaphase
E)  anaphase,telophaseF) A) and E)
G) D) and E)

Question 12

Which of the following is not involved in the regulation of the cell cycle?

Accepted Answer

A)  cyclins
B)  internal and external signals
C)  growth factors
D)  checkpoints
E)  caspasesF) A) and B)
G) A) and C)

Question 13

When does apoptosis occur?

Accepted Answer

A)  during development
B)  during interphase
C)  during mitosis
D)  during meiosis
E)  during injury repairF) B) and E)
G) A) and B)

Question 14

Crossing-over is the only factor that is responsible for the variation that exists between offspring of one set of parents.

Accepted Answer

A) True 
 B)False

Question 15

Eukaryotic chromosomes are composed of

Accepted Answer

A)  DNA.
B)  protein.
C)  histones.
D)  chromatin.
E)  RNA.F) C) and D)
G) B) and E)

Question 16

The second meiotic division is essentially a mitotic division except for the fact that the cells produced are

Accepted Answer

A)  haploid.
B)  diploid.
C)  polyploid.
D)  autosomal.
E)  somatic.F) B) and C)
G) A) and E)

Question 17

Which sequence of stages in mitosis is correct?

Accepted Answer

A)  prophase,metaphase,interphase,telophase
B)  metaphase,anaphase,prophase,telophase
C)  anaphase,interphase,telophase,prophase
D)  prophase,metaphase,anaphase,telophase
E)  interphase,metaphase,prophase,anaphaseF) A) and D)
G) C) and E)

Question 18

What is a potential outcome if one of your father's gametes did not go through meiosis correctly and one of the chromosomes did not separate correctly?

Accepted Answer

A)  You inherited a normal amount of genetic material from your mother but inherited an extra chromosome from your father.One of your pairs of chromosomes will not be homologous.
B)  You inherited an abnormal amount of genetic material from both your mother and father.One of your pairs of chromosomes will not be homologous.
C)  You inherited a normal amount of genetic material from your mother but inherited an extra chromosome from your father.Two of your pairs of chromosomes will not be homologous.
D)  You inherited a normal amount of genetic material from both your mother and father resulting in the inheritance of a normal amount of genetic material.
E)  You inherited multiple genetic abnormalities,due to the faulty chromosomes from your father,resulting in a significant number of health issues.F) A) and B)
G) All of the above

Exam 5: Cell Division

Which of the following best describes the role of histones?

Correct Answer
verified

If a crayfish has 200 total chromosomes in its body cells (not ovaries or testes) ,

Correct Answer
verified

Would it be possible to observe crossing-over between sister chromatids? Why or why not?

Correct Answer
verified

Replication of the DNA for meiosis occurs between telophase I and prophase II.

Correct Answer
verified

Which of the following events would be controlled by an external signal?

Correct Answer
verified

Crossing-over is the only factor that is responsible for the variation that exists between offspring of one set of parents.

Correct Answer
verified

In humans,the diploid number of chromosomes is

Correct Answer
verified

During which phases of the cell cycle do the chromosomes look like Xs?

Correct Answer
verified

When does apoptosis occur?

Correct Answer
verified

You are examining a cell under the microscope that is undergoing cell division and cannot find any asters.What else would not be present in this cell?

Correct Answer
verified

What is a potential outcome if one of your father's gametes did not go through meiosis correctly and one of the chromosomes did not separate correctly?

Correct Answer
verified

You are examining a cell under the microscope and see what appear to be four sister chromatids bound together and remnants of the nuclear envelope.What stage of meiosis are you looking at?

Correct Answer
verified

The second meiotic division is essentially a mitotic division except for the fact that the cells produced are

Correct Answer
verified

Without considering the variation provided by crossing-over,how much will two siblings from one set of parents vary from each other?

Correct Answer
verified

Eukaryotic chromosomes are composed of

Correct Answer
verified

Which of the following is not involved in the regulation of the cell cycle?

Correct Answer
verified

What forms the contractile ring in animal cells?

Correct Answer
verified

Which sequence of stages in mitosis is correct?

Correct Answer
verified

Exam 5: Cell Division

Which of the following best describes the role of histones?

Correct AnswerverifiedShow Answer

If a crayfish has 200 total chromosomes in its body cells (not ovaries or testes) ,

Correct AnswerverifiedShow Answer

Would it be possible to observe crossing-over between sister chromatids? Why or why not?

Correct AnswerverifiedShow Answer

Replication of the DNA for meiosis occurs between telophase I and prophase II.

Correct AnswerverifiedShow Answer

Which of the following events would be controlled by an external signal?

Correct AnswerverifiedShow Answer

Crossing-over is the only factor that is responsible for the variation that exists between offspring of one set of parents.

Correct AnswerverifiedShow Answer

In humans,the diploid number of chromosomes is

Correct AnswerverifiedShow Answer

During which phases of the cell cycle do the chromosomes look like Xs?

Correct AnswerverifiedShow Answer

When does apoptosis occur?

Correct AnswerverifiedShow Answer

You are examining a cell under the microscope that is undergoing cell division and cannot find any asters.What else would not be present in this cell?

Correct AnswerverifiedShow Answer

What is a potential outcome if one of your father's gametes did not go through meiosis correctly and one of the chromosomes did not separate correctly?

Correct AnswerverifiedShow Answer

You are examining a cell under the microscope and see what appear to be four sister chromatids bound together and remnants of the nuclear envelope.What stage of meiosis are you looking at?

Correct AnswerverifiedShow Answer

The second meiotic division is essentially a mitotic division except for the fact that the cells produced are

Correct AnswerverifiedShow Answer

Without considering the variation provided by crossing-over,how much will two siblings from one set of parents vary from each other?

Correct AnswerverifiedShow Answer

Eukaryotic chromosomes are composed of

Correct AnswerverifiedShow Answer

Which of the following is not involved in the regulation of the cell cycle?

Correct AnswerverifiedShow Answer

What forms the contractile ring in animal cells?

Correct AnswerverifiedShow Answer

Which sequence of stages in mitosis is correct?

Correct AnswerverifiedShow Answer

Correct Answer
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