ANSI 3423 PRACTICE EXAMINATION
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ G1.
Answer: stage of cell cycle where cell makes copies of organelles and grows
larger is:
◍ The C value is the amount of DNA in aA) haploid genome.B) bacterial
genome.C) diploid genome.D) cell's nucleus.E) eukaryotic genome..
Answer: A) haploid genome.
◍ The chromosome of most prokaryotes differs from those of eukaryotes
becauseA) the prokaryotic chromosome does not replicate before mitosis,
while the eukaryotic does.B) the prokaryotic chromosome is circular, while
the eukaryotic is linear.C) the prokaryotic chromosome is not necessary for
survival, while the eukaryotic is.D) the prokaryotic chromosome does not
contain genes, while the eukaryotic does.E) the prokaryotic chromosome is
linear, while the eukaryotic is circular..
Answer: B) the prokaryotic chromosome is circular, while the eukaryotic is
linear.
◍ A Barr body is an example ofA) a nucleosome.B) constitutive
euchromatin.C) facultative heterochromatin.D) constitutive
heterochromatin.E) facultative euchromatin..
Answer: C) facultative heterochromatin.
◍ Antiparallel means thatA) the helix twists to the right.B) opposite strands
are held together by base pairing.C) each DNA molecule consists of one old
and one new strand.D) the two polynucleotide chains run in opposite
directions.E) there is complementary base-pairing..
, Answer: D) the two polynucleotide chains run in opposite directions.
◍ sister chromatids.
Answer: which of the following has entirely identical DNA sequences?
◍ The genetic material of a virus may beA) double-stranded RN
A. B) single-stranded RN
A. C) double-stranded DN
A. D) single-stranded DN
A. E) all of the above..
Answer: E) all of the above. double-stranded RNA.single-stranded
RNA.Double-stranded DNA.single-stranded DNA.
◍ genetics.
Answer: science that deals with the study of heredity and variation
◍ Loosely aggregated DNA bound to proteins in a eukaryotic cell is called
________; when the cell divides, this condenses into ________.A) nucleoid,
nucleusB) chromatid, nucleusC) chromatin, chromosomesD) chromosomes,
centromereE) chromosomes, chromatin.
Answer: C) chromatin, chromosomes
◍ Charles Darwin.
Answer: wrote "On the Origin of Species" in 1859
◍ Gregor Mendel.
Answer: father of modern genetics; studied garden peas
◍ What of the following is a pyrimidine only found in DNA?A) UracilB)
GuanineC) CytosineD) AdenineE) Thymine.
Answer: E) Thymine
◍ quantitative genetics.
Answer: study of measurable traits
◍ (T/F) In RNA, the pyrimidine bases are cytosine and thymine..
Answer: False
◍ study of traits in a group.
, Answer: population genetics
◍ study of chromosomes.
Answer: cytogenetics
◍ (T/F) In a strand of DNA, a hydrogen bond connects that phosphate group
of one nucleotide to the sugar of the adjacentnucleotide..
Answer: False
◍ (T/F) In eukaryotes, the greatest amount of tandemly repeated DNA is
associated with centromeres and telomeres..
Answer: True
◍ molecular function and structure of genes.
Answer: molecular genetics
◍ During replication, the direction of synthesis of new DNA from the leading
and lagging strands is A) 3' to 5' only.B) 5' to 3' only.C) from left to right
only.D) both 5' to 3' and 3' to 5'.E) different, depending on whether the cell
is prokaryotic or eukaryotic..
Answer: B) 5' to 3' only.
◍ In both prokaryotes and eukaryotes, DNA replication is A) bidirectional and
semiconservative.B) dispersive and semiconservative.C) unidirectional and
dispersive.D) bidirectional and dispersive.E) unidirectional and
semiconservative..
Answer: A) bidirectional and semiconservative.
◍ transmission of genes and traits from generation to generation.
Answer: classical (mendelian) genetics
◍ In eukaryotes, chromosomes are duplicated during which stage of the cell
cycle? A) G2 B) M C) S D) G1 E) C1.
Answer: C) S
◍ total genetic component of an organism.
Answer: genome
◍ How many replication forks are produced when DNA denatures at an
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ G1.
Answer: stage of cell cycle where cell makes copies of organelles and grows
larger is:
◍ The C value is the amount of DNA in aA) haploid genome.B) bacterial
genome.C) diploid genome.D) cell's nucleus.E) eukaryotic genome..
Answer: A) haploid genome.
◍ The chromosome of most prokaryotes differs from those of eukaryotes
becauseA) the prokaryotic chromosome does not replicate before mitosis,
while the eukaryotic does.B) the prokaryotic chromosome is circular, while
the eukaryotic is linear.C) the prokaryotic chromosome is not necessary for
survival, while the eukaryotic is.D) the prokaryotic chromosome does not
contain genes, while the eukaryotic does.E) the prokaryotic chromosome is
linear, while the eukaryotic is circular..
Answer: B) the prokaryotic chromosome is circular, while the eukaryotic is
linear.
◍ A Barr body is an example ofA) a nucleosome.B) constitutive
euchromatin.C) facultative heterochromatin.D) constitutive
heterochromatin.E) facultative euchromatin..
Answer: C) facultative heterochromatin.
◍ Antiparallel means thatA) the helix twists to the right.B) opposite strands
are held together by base pairing.C) each DNA molecule consists of one old
and one new strand.D) the two polynucleotide chains run in opposite
directions.E) there is complementary base-pairing..
, Answer: D) the two polynucleotide chains run in opposite directions.
◍ sister chromatids.
Answer: which of the following has entirely identical DNA sequences?
◍ The genetic material of a virus may beA) double-stranded RN
A. B) single-stranded RN
A. C) double-stranded DN
A. D) single-stranded DN
A. E) all of the above..
Answer: E) all of the above. double-stranded RNA.single-stranded
RNA.Double-stranded DNA.single-stranded DNA.
◍ genetics.
Answer: science that deals with the study of heredity and variation
◍ Loosely aggregated DNA bound to proteins in a eukaryotic cell is called
________; when the cell divides, this condenses into ________.A) nucleoid,
nucleusB) chromatid, nucleusC) chromatin, chromosomesD) chromosomes,
centromereE) chromosomes, chromatin.
Answer: C) chromatin, chromosomes
◍ Charles Darwin.
Answer: wrote "On the Origin of Species" in 1859
◍ Gregor Mendel.
Answer: father of modern genetics; studied garden peas
◍ What of the following is a pyrimidine only found in DNA?A) UracilB)
GuanineC) CytosineD) AdenineE) Thymine.
Answer: E) Thymine
◍ quantitative genetics.
Answer: study of measurable traits
◍ (T/F) In RNA, the pyrimidine bases are cytosine and thymine..
Answer: False
◍ study of traits in a group.
, Answer: population genetics
◍ study of chromosomes.
Answer: cytogenetics
◍ (T/F) In a strand of DNA, a hydrogen bond connects that phosphate group
of one nucleotide to the sugar of the adjacentnucleotide..
Answer: False
◍ (T/F) In eukaryotes, the greatest amount of tandemly repeated DNA is
associated with centromeres and telomeres..
Answer: True
◍ molecular function and structure of genes.
Answer: molecular genetics
◍ During replication, the direction of synthesis of new DNA from the leading
and lagging strands is A) 3' to 5' only.B) 5' to 3' only.C) from left to right
only.D) both 5' to 3' and 3' to 5'.E) different, depending on whether the cell
is prokaryotic or eukaryotic..
Answer: B) 5' to 3' only.
◍ In both prokaryotes and eukaryotes, DNA replication is A) bidirectional and
semiconservative.B) dispersive and semiconservative.C) unidirectional and
dispersive.D) bidirectional and dispersive.E) unidirectional and
semiconservative..
Answer: A) bidirectional and semiconservative.
◍ transmission of genes and traits from generation to generation.
Answer: classical (mendelian) genetics
◍ In eukaryotes, chromosomes are duplicated during which stage of the cell
cycle? A) G2 B) M C) S D) G1 E) C1.
Answer: C) S
◍ total genetic component of an organism.
Answer: genome
◍ How many replication forks are produced when DNA denatures at an
