BIO BEYOND GENETIC REPLICATION
ASSESSMENT SCRIPT 2026 ACCURATE
QUESTIONS AND DETAILED SOLUTIONS
CERTIFICATION PREP RESOURCE GRADED
A+
⩥Which of the following enzymes creates a primer for DNA
polymerase?
Answer: Primase
⩥Which of the following statements about Okazaki fragments in E. coli
is true?
Answer: They are formed on the lagging strand of DNA.
⩥Which of the following enzymes is important for relieving the tension
in a helix as it unwinds during DNA synthesis?
Answer: Topoisomerase
⩥True or false? Single-stranded DNA molecules are said to be
antiparallel when they are lined up next to each other but oriented in
opposite directions.
Answer: True
,⩥In his work with pneumonia-causing bacteria and mice, Griffith found
that __________.
Answer: some substance from pathogenic cells was transferred to
nonpathogenic cells, making them pathogenic
⩥In analyzing the number of different bases in a DNA sample, which
result would be consistent with the base-pairing rules?
Answer: A + G = C + T
⩥E. coli cells grown on 15N medium are transferred to 14N medium
and allowed to grow for two more generations (two rounds of DNA
replication). DNA extracted from these cells is centrifuged. What density
distribution of DNA would you expect in this experiment?
Answer: one low-density and one intermediate-density band
⩥In his transformation experiments, which of the following results did
Griffith observe?
Answer: Mixing a heat-killed pathogenic strain of bacteria with a living
nonpathogenic strain can convert some of the living cells into the
pathogenic form.
⩥Which of the following statements most accurately describes
transformation in bacteria?
Answer: Transformation is the assimilation of external DNA into a cell.
, ⩥In trying to determine whether DNA or protein was the genetic
material, Hershey and Chase made use of which of the following facts
about these two types of molecules?
Answer: DNA contains phosphorus, whereas protein does not
⩥Which of the following statements correctly describes one of
Chargaff's rules regarding DNA?
Answer: The percentages of adenine and thymine are roughly equal, as
are the percentages of guanine and cytosine in the DNA of a given
species.
⩥Cytosine makes up 42% of the nucleotides in a sample of DNA from
an organism. Approximately what percentage of the nucleotides in this
sample will be thymine?
Answer: 8%
⩥Which of the following characteristics of the structure of DNA allows
it to carry a large amount of hereditary information?
Answer: the sequence of bases
⩥In an analysis of the nucleotide composition of DNA, which of the
following will be found in a given DNA molecule?
Answer: A + C = G + T
ASSESSMENT SCRIPT 2026 ACCURATE
QUESTIONS AND DETAILED SOLUTIONS
CERTIFICATION PREP RESOURCE GRADED
A+
⩥Which of the following enzymes creates a primer for DNA
polymerase?
Answer: Primase
⩥Which of the following statements about Okazaki fragments in E. coli
is true?
Answer: They are formed on the lagging strand of DNA.
⩥Which of the following enzymes is important for relieving the tension
in a helix as it unwinds during DNA synthesis?
Answer: Topoisomerase
⩥True or false? Single-stranded DNA molecules are said to be
antiparallel when they are lined up next to each other but oriented in
opposite directions.
Answer: True
,⩥In his work with pneumonia-causing bacteria and mice, Griffith found
that __________.
Answer: some substance from pathogenic cells was transferred to
nonpathogenic cells, making them pathogenic
⩥In analyzing the number of different bases in a DNA sample, which
result would be consistent with the base-pairing rules?
Answer: A + G = C + T
⩥E. coli cells grown on 15N medium are transferred to 14N medium
and allowed to grow for two more generations (two rounds of DNA
replication). DNA extracted from these cells is centrifuged. What density
distribution of DNA would you expect in this experiment?
Answer: one low-density and one intermediate-density band
⩥In his transformation experiments, which of the following results did
Griffith observe?
Answer: Mixing a heat-killed pathogenic strain of bacteria with a living
nonpathogenic strain can convert some of the living cells into the
pathogenic form.
⩥Which of the following statements most accurately describes
transformation in bacteria?
Answer: Transformation is the assimilation of external DNA into a cell.
, ⩥In trying to determine whether DNA or protein was the genetic
material, Hershey and Chase made use of which of the following facts
about these two types of molecules?
Answer: DNA contains phosphorus, whereas protein does not
⩥Which of the following statements correctly describes one of
Chargaff's rules regarding DNA?
Answer: The percentages of adenine and thymine are roughly equal, as
are the percentages of guanine and cytosine in the DNA of a given
species.
⩥Cytosine makes up 42% of the nucleotides in a sample of DNA from
an organism. Approximately what percentage of the nucleotides in this
sample will be thymine?
Answer: 8%
⩥Which of the following characteristics of the structure of DNA allows
it to carry a large amount of hereditary information?
Answer: the sequence of bases
⩥In an analysis of the nucleotide composition of DNA, which of the
following will be found in a given DNA molecule?
Answer: A + C = G + T
