Dna Structure And Function

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Question 1
Free
Multiple Choice

In which body or cell area are most genes in humans located?

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A

Nucleus

B

Mitochondrion

C

Cytoplasm

D

Plasma membrane

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Question 2
Free
Multiple Choice

Which condition or statement exemplifies the concept of genomics rather than genetics?

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A

The gene for insulin is located on chromosome 11 in all people.

B

Expression of any single gene is dependent on inheriting two alleles.

C

Sex-linked recessive disorders affect males more often than females.

D

One allele for each gene is inherited from the mother, and one is inherited from the father.

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Question 3
Free
Multiple Choice

What is the purpose of phosphorous in a DNA strand?

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A

Linking the nucleotides into a strand

B

Holding complementary strands together

C

Ensuring that a purine is always paired with a pyrimidine

D

Preventing the separation of double-stranded DNA into single-stranded DNA

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Question 4
Free
Multiple Choice

What is the term used to define alternative forms of a gene that may result in different expression of the trait coded for by that gene?

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A

Alleles

B

Bases

C

Centromeres

D

Diploids

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Question 5
Free
Multiple Choice

What percentage of bases in a stretch of double-stranded DNA that contains 30% guanine (G) bases would be adenine (A)?

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A

70%

B

60%

C

30%

D

20%

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Question 6
Multiple Choice

What is the term used to describe the organized picture of the paired chromosomes within a cell used to determine whether chromosome numbers, structures, and bandingpatterns are normal?

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A
Pedigree
B
Phenotype
C
Karyotype
D
Autotype
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Question 7
Multiple Choice

What would be the sequence of DNA that is complementary to a DNA section with the base sequence of GGTCAATCCTTAG?

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A
GATTCCTAACTGG
B
TTGACCGAAGGCT
C
AACTGGCTTCCGA
D
CCAGTTAGGAATC
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Question 8
Multiple Choice

Which of these complementary base pairs form the strongest or "tightest" association?

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A
Adenine and thymine
B
Cytosine and guanine
C
Guanine and thymine
D
Cytosine and adenine
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Question 9
Multiple Choice

What activity occurs during M phase of the cell cycle?

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A
The cell undergoes cytokinesis.
B
Activity stops, and the cell "sleeps."
C
All DNA is completely replicated.
D
The cell greatly increases protein synthesis.
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Question 10
Multiple Choice

Which chromosome number represents the euploid state for normal human somatic cells?

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A
44
B
46
C
47
D
48
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Question 11
Multiple Choice

How does the proteome differ from the genome?

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A
The proteome changes in response to intracellular and extracellular signals.
B
The genome changes in response to intracellular and extracellular signals.
C
The proteome is stable in somatic cells and unstable in germ cells, whereas the genome is stable in both somatic cells and germ cells.
D
The genome is stable in somatic cells and unstable in germ cells, whereas the proteome is stable in both somatic cells and germ cells.
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Question 12
Multiple Choice

What is the most outstanding feature of a mature haploid cell?

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A
It is usually homozygous.
B
The sex chromosomes are missing.
C
Only one chromosome of each pair is present.
D
DNA synthesis occurs after mitosis instead of before.
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Question 13
Multiple Choice

At what phase of the cell cycle are chromosomes visible as separate structures?

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A
G1
B
G2
C
S
D
M
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Question 14
Multiple Choice

Which statement about the cell cycle phase of G0 is true?

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A
Hyperplastic growth in place of hypertrophic growth
B
Performance of specific differentiated functions
C
Initiation and completion of nucleokinesis
D
Replication of DNA
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Question 15
Multiple Choice

What is the result of normal DNA replication?

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A
Formation of two new daughter cells
B
Formation of two identical sets of DNA
C
Disappearance of the original parent cell
D
Activation and attachment of spindle fibers
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Question 16
Multiple Choice

Which statement regarding chromosome structure or function is true?

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A
The chromatids of any single chromosome are known as "sister chromatids."
B
The genes located on the telomeres of chromosomes are identical to the genes in the centromeres.
C
Immediately before the mitosis phase of cell division, the chromosomes of all somatic cells are haploid.
D
A specific gene allele on one chromosome has a complementary allele on the other chromosome of a pair.
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Question 17
Multiple Choice

Why does a person with normal chromosomes only have two alleles for any single gene trait?

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A
A minimum of two alleles is required for the expression of monogenic traits.
B
When a dominant allele is paired with a recessive allele, only the dominant allele is expressed, and the recessive allele is silent.
C
One allele for the monogenic trait is on the paternally derived chromosome, and the other allele is on the maternally derived chromosome.
D
Expression of more than two alleles of any single-gene trait results in enhanced expression of recessive alleles and suppressed expression of dominant alleles.
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Question 18
Multiple Choice

Under what normal condition are genotype and phenotype always the same?

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A
Euploidy of alleles
B
Aneuploidy of alleles
C
Homozygosity of alleles
D
Heterozygosity of alleles
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Question 19
Multiple Choice

What would be the expected result of a drug that affected a particular tissue by causing new DNA to form with covalent bonds instead of hydrogen bonds?

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A
None of the cells in the affected tissue would be able to leave G0 and enter the cell cycle.
B
Replication of DNA would result in identical DNA strands instead of complementary strands.
C
Mitosis of cells in the tissue would result in the production of three new daughter cells instead of just two.
D
The new cells that formed within this tissue would not be able to complete the next round of mitosis successfully.
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Question 20
Multiple Choice

How does the DNA enzyme topoisomerase contribute to DNA replication?

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A
Unwinds the double helix and separates the double-stranded DNA
B
Creates a "nick" in the DNA supercoils, allowing them to straighten before replication
C
Initiates DNA synthesis in multiple sites down the strand, making the process more efficient
D
Connects and links the individual pieces of newly synthesized DNA to form a single strand
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