Question 1

All these are found in the karyotype of a normal human male, except

Accepted Answer

A)  46 chromosomes.
B)  23 pairs of homologous chromosomes.
C)  X and Y chromosomes.
D)  46 chromatids.
E)  92 DNA molecules.F) A) and B)
G) All of the above

Question 2

Hemophilia is caused by a sex-linked recessive allele.This means that

Accepted Answer

A)  women can be carriers but cannot get hemophilia.
B)  the gene is found on the Y chromosome.
C)  a man can give the allele to his son but not to his daughter.
D)  a son who has hemophilia inherited the allele from his mother.
E)  a son who has hemophilia inherited the allele from his father.F) B) and C)
G) C) and D)

Question 3

DNA is composed of double-ring nitrogenous bases, whereas RNA is composed of single-ring nitrogenous bases.

Accepted Answer

A) True 
 B)False

Question 4

In familial hypercholesterolemia, individuals with two abnormal alleles die of heart attacks in childhood, those with only one abnormal allele typically die as young adults, and those with two normal alleles have normal life expectancies.This exemplifies

Accepted Answer

A)  penetrance.
B)  codominance.
C)  pleiotropy.
D)  complete dominance.
E)  incomplete dominance.F) A) and E)
G) A) and B)

Question 5

The alleles possessed by all members of a population collectively are called the

Accepted Answer

A)  species DNA.
B)  population DNA.
C)  gene pool.
D)  chromosomes.
E)  genes.F) C) and D)
G) A) and C)

Question 6

opens up one segment of the DNA helix during replication, whereas adds complementary free nucleotides to the exposed DNA strand.

Accepted Answer

A)  DNA ligase; DNA helicase
B)  DNA helicase; DNA polymerase
C)  DNA ligase; DNA polymerase
D)  DNA helicase; DNA ligase
E)  DNA polymerase; DNA ligaseF) A) and C)
G) A) and E)

Question 7

A is composed of a granular cluster of eight proteins called with DNA wound around them, plus a short segment of linker DNA.

Accepted Answer

A)  nucleosome; centrosomes
B)  nucleosome; histones
C)  chromosome; histones
D)  chromosome; centromeres
E)  centromere; chromatinF) A) and D)
G) C) and E)

Question 8

The genetic code is the correspondence between the and the that they represent.

Accepted Answer

A)  DNA molecule; 20 amino acids
B)  DNA molecule; 64 amino acids
C)  mRNA anticodons; 20 amino acids
D)  mRNA codons; 64 amino acids
E)  mRNA codons; 20 amino acidsF) All of the above
G) D) and E)

Question 9

The stage at which chromosomes aggregate along the equator of a cell is

Accepted Answer

A)  prophase.
B)  metaphase.
C)  anaphase.
D)  telophase.
E)  interphase.F) A) and B)
G) A) and C)

Question 10

All of the following participate in DNA replication except

Accepted Answer

A)  DNA.
B)  ribosomes.
C)  DNA ligase.
D)  DNA helicase.
E)  DNA polymerase.F) B) and C)
G) B) and E)

Question 11

In the cell cycle, DNA polymerase is most active in phase.

Accepted Answer

A)  S
B)  G1
C)  G2
D)  M
E)  G0F) C) and E)
G) None of the above

Question 12

Cytokinesis overlaps with which phase of mitosis?

Accepted Answer

A)  the S phase
B)  telophase
C)  metaphase
D)  prophase
E)  interphaseF) A) and D)
G) A) and E)

Question 13

This figure shows translation of mRNA.What does "E" show?

Accepted Answer

A)  a newly synthesized amino acid
B)  a newly synthesized polypeptide
C)  a newly synthesized nucleic acid
D)  mRNA
E)  tRNAF) A) and E)
G) C) and D)

Question 14

This figure shows the DNA structure.What does "E" represent?

Accepted Answer

A)  a nitrogenous base
B)  a pyrimidine
C)  a purine
D)  a nucleotide
E)  a fragment of the sugar-phosphate backboneF) C) and D)
G) All of the above

Question 15

Since there are no genes coding for carbohydrates, nucleic acids, or lipids, how do cells produce them?

Accepted Answer

A)  Enzymes encoded by genes synthesize these products.
B)  Cells are born with all the products they need.
C)  Cells absorb these products by endocytosis.
D)  Cells import these products from older cells.
E)  Cells can produce carbohydrates, nucleic acids, and lipids out of proteins.F) A) and B)
G) A) and C)

Question 16

Cell division is stimulated by and suppressed by .

Accepted Answer

A)  mitosis; cytokinesis
B)  mitosis; contact inhibition
C)  cell size; cytokinesis
D)  growth factors; contact inhibition
E)  cell size; contact inhibitionF) B) and E)
G) A) and D)

Question 17

This figure shows translation of mRNA.What does "A" show?

Accepted Answer

A)  the molecule that carries codons
B)  the molecule that carries anticodons
C)  the molecule that carries base triplets
D)  the molecule that carries amino acids
E)  the molecule that carries tRNAF) A) and D)
G) None of the above

Question 18

Naked DNA is called chromatin.

Accepted Answer

A) True 
 B)False

Question 19

Chromatin shortens and thickens, coiling into compact rods, during

Accepted Answer

A)  telophase.
B)  anaphase.
C)  interphase.
D)  prophase.
E)  metaphase.F) A) and B)
G) B) and D)

Question 20

Which of these processes occurs during a cell's first gap (G1)  phase?

Accepted Answer

A)  DNA is semiconservatively replicated.
B)  The nuclear envelope breaks down.
C)  The cell synthesizes the enzymes that control mitosis.
D)  The cell synthesizes proteins and grows.
E)  The chromatin condenses into visible chromosomes.F) B) and E)
G) B) and D)

Exam 4: Genes and Cellular Function

In familial hypercholesterolemia, individuals with two abnormal alleles die of heart attacks in childhood, those with only one abnormal allele typically die as young adults, and those with two normal alleles have normal life expectancies.This exemplifies

Correct AnswerverifiedShow Answer

A is composed of a granular cluster of eight proteins called with DNA wound around them, plus a short segment of linker DNA.

Correct AnswerverifiedShow Answer

The stage at which chromosomes aggregate along the equator of a cell is

Correct AnswerverifiedShow Answer

Which of these processes occurs during a cell's first gap (G1) phase?

Correct AnswerverifiedShow Answer

DNA is composed of double-ring nitrogenous bases, whereas RNA is composed of single-ring nitrogenous bases.

Correct AnswerverifiedShow Answer

Cell division is stimulated by and suppressed by .

Correct AnswerverifiedShow Answer

opens up one segment of the DNA helix during replication, whereas adds complementary free nucleotides to the exposed DNA strand.

Correct AnswerverifiedShow Answer

This figure shows the DNA structure.What does "E" represent?

Correct AnswerverifiedShow Answer

Cytokinesis overlaps with which phase of mitosis?

Correct AnswerverifiedShow Answer

All of the following participate in DNA replication except

Correct AnswerverifiedShow Answer

Since there are no genes coding for carbohydrates, nucleic acids, or lipids, how do cells produce them?

Correct AnswerverifiedShow Answer

The alleles possessed by all members of a population collectively are called the

Correct AnswerverifiedShow Answer

Chromatin shortens and thickens, coiling into compact rods, during

Correct AnswerverifiedShow Answer

In the cell cycle, DNA polymerase is most active in phase.

Correct AnswerverifiedShow Answer

Naked DNA is called chromatin.

Correct AnswerverifiedShow Answer

This figure shows translation of mRNA.What does "E" show?

Correct AnswerverifiedShow Answer

Hemophilia is caused by a sex-linked recessive allele.This means that

Correct AnswerverifiedShow Answer

This figure shows translation of mRNA.What does "A" show?

Correct AnswerverifiedShow Answer

All these are found in the karyotype of a normal human male, except

Correct AnswerverifiedShow Answer

The genetic code is the correspondence between the and the that they represent.

Correct AnswerverifiedShow Answer

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