Quiz - Chapter 4
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1.
Which of the following bases are single-ringed structures in the DNA molecule?
A.
Cytosine and thymine
B.
Cytosine and adenine
C.
Thymine and guanine
D.
Guanine and adenine
2.
Which of the following terms best describes the DNA subunit of one deoxyribose molecule, one phosphate group, and one base?
A.
Polypeptide
B.
Double helix
C.
Nucleotide
D.
Codon
3.
Which of the following statements regarding codons is TRUE?
A.
There are 80 possible codons.
B.
There are 3 codons that signal the end of a gene.
C.
There are 70 codons that specify amino acids.
D.
Each amino acid has 1 codon.
4.
Which of the following describes the function of DNA polymerase?
A.
Synthesizes RNA from the DNA template
B.
Synthesizes a polypeptide
C.
Performs base pairing in replication
D.
Splits DNA molecules
5.
Which of the following best describes a silent mutation?
A.
A change in the DNA but an amino acid change does not occur
B.
Insertion or deletion of one or more base pairs
C.
Increases the number or frequency of mutations
D.
A mutation that occurs in the absence of an exposure
6.
Which of the following statements is TRUE?
A.
Protein synthesis takes place in the cytoplasm.
B.
DNA is replicated in the cytoplasm.
C.
RNA is double stranded.
D.
RNA contains the same bases as DNA.
7.
Which of the following statements is TRUE regarding base pairs?
A.
Adenine pairs with guanine.
B.
Guanine pairs with thymine.
C.
Cytosine pairs with adenine.
D.
Uracil pairs with adenine.
8.
Which of the following terms describes the sequence for the beginning of a gene?
A.
Intron
B.
Exon
C.
Promoter site
D.
Anticodon
9.
Which of the following statements regarding chromosomes is TRUE?
A.
There are three cell types.
B.
The somatic cells contain 46 chromosomes.
C.
Gametes are diploid cells.
D.
Diploid cells are formed through meiosis.
10.
Which of the following terms describes a cell that does not contain a multiple of 23 chromosomes?
A.
Aneuploid
B.
Monosomy
C.
Trisomy
D.
Tetraploidy
11.
Which of the following statements regarding Down syndrome is TRUE?
A.
It occurs in 1 in 8000 live births.
B.
Persons with Down syndrome have a normal IQ.
C.
Persons with Down syndrome have a distinctive facial appearance.
D.
Persons with Down syndrome are tall with good muscle tone.
12.
Which of the following syndromes describes a woman born with short stature, webbing of the neck, sparse body hair, and narrowing of the aorta?
A.
Klinefelter syndrome
B.
Down syndrome
C.
Turner syndrome
D.
Fetal alcohol syndrome
13.
A person is born with the deletion of the short arm of the chromosome 5. Which of the following syndromes will this child most likely have?
A.
Down syndrome
B.
Turner syndrome
C.
Fragile X syndrome
D.
Cri du chat syndrome
14.
Which term best describes an allele with an observable effect?
A.
Homozygous
B.
Heterozygous
C.
Dominant
D.
Recessive
15.
Which of the following statements regarding autosomal dominant gene transmission is TRUE?
A.
The affected parent transmits the gene to half of his or her children.
B.
The affected gene is found in males only.
C.
There is skipping of generations for transmission.
D.
Females will transmit the disease more often than males.
16.
Which of the following is a TRUE statement regarding autosomal recessive inheritance?
A.
Parents will always display the trait.
B.
Approximately 50% of children will display the trait.
C.
Males and females are affected equally.
D.
An individual must be heterozygous to display a recessive trait.
17.
Which of the following is a TRUE statement regarding sex-linked inheritance?
A.
Most sex-linked traits occur on the Y chromosome.
B.
X-linked recessive diseases are more common than X-linked dominant diseases.
C.
Females are more affected by X-linked diseases.
D.
Females are always homozygous for X-linked traits.
18.
Gene products coded by the X chromosome are present in equal amounts in both males and females because:
A.
X inactivation occurs early in embryonic development.
B.
Males have Barr bodies that provide a second copy of the X chromosome.
C.
Females are hemizygous.
D.
Males have two copies of the X chromosome plus a Y chromosome.
Quiz - Chapter 4