Question 1

Why don't plant cells form a cleavage furrow during cytokinesis?

Accepted Answer

A)  Because they don't have a cell membrane
B)  Because their cells don't divide after mitosis, but become one larger cell with multiple nuclei
C)  Because they have a cell wall
D)  Because they don't have a nucleus
E)  All are correctF) B) and C)
G) A) and E)

Question 2

The process by which DNA reproduces itself is:

Accepted Answer

A)  Protein synthesis
B)  Aerobic respiration
C)  Replication
D)  Substrate-phosphorylation
E)  PhotosynthesisF) B) and E)
G) C) and E)

Question 3

People with xeroderma pigmentosum (XP) are at greater risk of skin cancer because:

Accepted Answer

A)  They lack proteins that would repair the damage from exposure to ultraviolet radiation
B)  They have fewer layers of skin than normal
C)  They do not produce pigments
D)  Their skin cells do not reproduce
E)  All are correctF) A) and C)
G) D) and E) A

Question 4

In an asexual life cycle,cells reproduce by:

Accepted Answer

A)  Meiosis
B)  Fertilization
C)  Meiosis and Fertilization
D)  Mitosis
E)  All are correctF) B) and C)
G) All of the above D

Question 5

The portion of the cytoskeleton that enables the chromosomes to be separated equally into two sets is the:

Accepted Answer

A)  Golgi body
B)  Centromere
C)  Centrosome
D)  Mitotic spindle
E)  KinetochoreF) A) and B)
G) C) and D)

Question 6

The enzyme that joins Okazaki fragments is:

Accepted Answer

A)  Primase
B)  DNA polymerase
C)  Ligase
D)  ATP synthase
E)  HelicaseF) C) and E)
G) B) and D)

Question 7

The chemotherapy drug taxol inhibits microtubule function.A cell treated with taxol would become stuck in which phase?

Accepted Answer

A)  Prophase
B)  Metaphase
C)  Anaphase
D)  Telophase
E)  CytokinesisF) B) and C)
G) B) and D)

Question 8

The enzyme telomerase adds DNA to the ends of chromosomes.Why would cancer cells express high levels of telomerase?

Accepted Answer

A)  As telomeres get shorter a cell loses the ability to divide
B)  The longer a chromosome is, the more genes a cancer cell will have
C)  Longer chromosomes have more active genes
D)  To allow the chromosomes to be replicated more rapidly
E)  Telomerase is a tumor suppressorF) B) and E)
G) None of the above

Question 9

In humans,specialized cells that produce gametes are:

Accepted Answer

A)  Germ cells
B)  Somatic cells
C)  Sperm cells
D)  Egg cells
E)  All are correctF) A) and C)
G) A) and E)

Question 10

When DNA replicates:

Accepted Answer

A)  The original DNA is not affected and a new double-stranded DNA is made from two new strands of DNA
B)  One strand of the original DNA ends up in each of the new DNA molecules
C)  The original DNA unwinds, and multiple copies of a region are transcribed before the DNA closes back up
D)  Transcription factors determine where to begin DNA replication
E)  A cell that was diploid (2N)  will now be tetraploid (4N) F) B) and D)
G) C) and E)

Question 11

Cyclophosphamide forms crosslinks between the two strands of DNA in a chromosome.How would this be effective in chemotherapy?

Accepted Answer

A)  It would block splicing
B)  It would block DNA replication
C)  It would activate oncogenes
D)  It would inactivate tumor suppressors
E)  It would block metaphaseF) C) and D)
G) B) and E) B

Question 12

The process used to determine the order of bases in DNA is DNA sequencing.

Accepted Answer

A) True 
 B)False

Question 13

The reason that the type "S" bacteria could infect mice and cause pneumonia was because:

Accepted Answer

A)  They had flagella as a means of movement
B)  They reproduced much faster than type "R" bacteria
C)  They produced a polysaccharide capsule (coat) 
D)  All are correctE) None of the above
F) B) and C)

Question 14

The process used to rapidly produce DNA sequences of interest is DNA sequencing.

Accepted Answer

A) True 
 B)False

Question 15

For the polymerase chain reaction (PCR) to work,the Taq _______ must be heat stable to avoid denaturation.

Accepted Answer

A)  DNA polymerase
B)  RNA polymerase
C)  Ribosome
D)  Primase
E)  DNALEARNING OUTCOME: 08.07.02 Identify the advantages and risks of cloning a mammal.SECTION: 08.07TOPIC: Cell Cycle and MitosisF) B) and D)
G) C) and E)

Question 16

Stem cells from an adult

Accepted Answer

A)  Can only produce certain types of cells
B)  Can form any type of cell in the body
C)  Cannot survive outside of the adult
D)  Can be formed by in vitro fertilization
E)  Are obtained from a blastocystF) B) and E)
G) A) and C)

Question 17

The enzyme that unwinds DNA is:

Accepted Answer

A)  Helicase
B)  Primase
C)  DNA polymerase
D)  ATP synthase
E)  LigaseF) A) and C)
G) A) and B)

Question 18

The four nitrogen bases that are found in the different nucleotides of DNA are:

Accepted Answer

A)  Adenine, thymine, cytosine, uracil
B)  Uracil, adenine, cytosine, guanine
C)  Uracil, cytosine, guanine, thymine
D)  Adenine, thymine, cytosine, guanine
E)  None are correctF) A) and B)
G) B) and C)

Question 19

figure 8.26 
-What did the researchers conclude from figure 8.26a?

Accepted Answer

A)  Endostatin shrunk tumors but resistance developed
B)  Cyclophosphamide delayed the growth of tumors without development of resistance
C)  Endostatin shrunk tumors without development of resistance
D)  Cyclophosphamide delayed the growth of tumors but resistance developed
E)  Tumors in untreated cells shrank in sizeF) A) and E)
G) None of the above

Question 20

The pair of unmatched chromosomes in humans:

Accepted Answer

A)  Are the sex chromosomes
B)  Are the "X" and "Y" chromosomes
C)  Determine sex (gender)  of humans
D)  Contain different genes
E)  All are correctF) A) and D)
G) A) and B)

Exam 8: Dna Replication, mitosis and the Cell Cycle

Why don't plant cells form a cleavage furrow during cytokinesis?

Correct AnswerverifiedShow Answer

The process by which DNA reproduces itself is:

Correct AnswerverifiedShow Answer

People with xeroderma pigmentosum (XP) are at greater risk of skin cancer because:

Correct AnswerverifiedA

In an asexual life cycle,cells reproduce by:

Correct AnswerverifiedD

The portion of the cytoskeleton that enables the chromosomes to be separated equally into two sets is the:

Correct AnswerverifiedShow Answer

The enzyme that joins Okazaki fragments is:

Correct AnswerverifiedShow Answer

The chemotherapy drug taxol inhibits microtubule function.A cell treated with taxol would become stuck in which phase?

Correct AnswerverifiedShow Answer

The enzyme telomerase adds DNA to the ends of chromosomes.Why would cancer cells express high levels of telomerase?

Correct AnswerverifiedShow Answer

In humans,specialized cells that produce gametes are:

Correct AnswerverifiedShow Answer

When DNA replicates:

Correct AnswerverifiedShow Answer

Cyclophosphamide forms crosslinks between the two strands of DNA in a chromosome.How would this be effective in chemotherapy?

Correct AnswerverifiedB

The process used to determine the order of bases in DNA is DNA sequencing.

Correct AnswerverifiedShow Answer

The reason that the type "S" bacteria could infect mice and cause pneumonia was because:

Correct AnswerverifiedShow Answer

The process used to rapidly produce DNA sequences of interest is DNA sequencing.

Correct AnswerverifiedShow Answer

For the polymerase chain reaction (PCR) to work,the Taq _______ must be heat stable to avoid denaturation.

Correct AnswerverifiedShow Answer

Stem cells from an adult

Correct AnswerverifiedShow Answer

The enzyme that unwinds DNA is:

Correct AnswerverifiedShow Answer

The four nitrogen bases that are found in the different nucleotides of DNA are:

Correct AnswerverifiedShow Answer

figure 8.26 -What did the researchers conclude from figure 8.26a?

Correct AnswerverifiedShow Answer

The pair of unmatched chromosomes in humans:

Correct AnswerverifiedShow Answer

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A

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D

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B

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