Bio 1610 Revision Exam 4 Questions
With Correct Solutions.
Which of the following is the meaning of the chromosome theory of inheritance as expressed in
the early twentieth century?
Natural selection acts on certain chromosome arrays rather than on genes.
Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis.
No more than a single pair of chromosomes can be found in a healthy normal cell.
Individuals inherit particular chromosomes attached to genes. - Answer Mendelian genes are
at specific loci on the chromosome and, in turn, segregate during meiosis.
In his transformation experiments, what did Griffith observe?
Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the
pathogenic strain nonpathogenic.
Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.
Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic
strains.
Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert
some of the living cells into the pathogenic form. - 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.
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made
use of which of the following facts?
DNA contains purines, whereas protein includes pyrimidines
DNA contains sulfur, whereas protein does not.
DNA contains nitrogen, whereas protein does not.
DNA contains phosphorus, whereas protein does not. - Answer DNA contains phosphorus,
whereas protein does not.
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?
8%
58%
, In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of
the nucleotide being added and _____ of the last nucleotide in the polymer
a nitrogen from the nitrogen-containing base
C6
The 3' OH
the 5' phosphate - Answer 3' OH
What is meant by the description "antiparallel" regarding the strands that make up DNA?
One strand contains only purines and the other contains only pyrimidines
The twisting nature of DNA creates nonparallel strands
Base pairings create unequal spacing between the two DNA strands.
The 5' to 3' direction of one strand runs counter to the to direction of the other strand. -
Answer The 5' to 3' direction of one strand runs counter to the to direction of the other
strand.
The leading and the lagging strands differ in that _____.
the leading strand is synthesized at twice the rate of the lagging strand
the lagging strand is synthesized continuously, whereas the leading strand is synthesized in
short fragments that are ultimately stitched together
the leading strand is synthesized by adding nucleotides to the end of the growing strand, and
the lagging strand is synthesized by adding nucleotides to the end
the leading strand is synthesized in the same direction as the movement of the replication fork,
and the lagging strand is synthesized in the opposite direction - Answer the leading strand is
synthesized in the same direction as the movement of the replication fork, and the lagging
strand is synthesized in the opposite direction
A new DNA strand elongates only in the 5' to 3' direction because _____.
replication must progress toward the replication fork
DNA polymerase can add nucleotides only to the free 3' end
DNA polymerase begins adding nucleotides at the 5' end of the template
the polarity of the DNA molecule prevents addition of nucleotides at the 3' end - Answer DNA
polymerase can add nucleotides only to the free 3' end
DNA is synthesized through a process known as _____.
With Correct Solutions.
Which of the following is the meaning of the chromosome theory of inheritance as expressed in
the early twentieth century?
Natural selection acts on certain chromosome arrays rather than on genes.
Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis.
No more than a single pair of chromosomes can be found in a healthy normal cell.
Individuals inherit particular chromosomes attached to genes. - Answer Mendelian genes are
at specific loci on the chromosome and, in turn, segregate during meiosis.
In his transformation experiments, what did Griffith observe?
Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the
pathogenic strain nonpathogenic.
Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.
Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic
strains.
Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert
some of the living cells into the pathogenic form. - 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.
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made
use of which of the following facts?
DNA contains purines, whereas protein includes pyrimidines
DNA contains sulfur, whereas protein does not.
DNA contains nitrogen, whereas protein does not.
DNA contains phosphorus, whereas protein does not. - Answer DNA contains phosphorus,
whereas protein does not.
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?
8%
58%
, In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of
the nucleotide being added and _____ of the last nucleotide in the polymer
a nitrogen from the nitrogen-containing base
C6
The 3' OH
the 5' phosphate - Answer 3' OH
What is meant by the description "antiparallel" regarding the strands that make up DNA?
One strand contains only purines and the other contains only pyrimidines
The twisting nature of DNA creates nonparallel strands
Base pairings create unequal spacing between the two DNA strands.
The 5' to 3' direction of one strand runs counter to the to direction of the other strand. -
Answer The 5' to 3' direction of one strand runs counter to the to direction of the other
strand.
The leading and the lagging strands differ in that _____.
the leading strand is synthesized at twice the rate of the lagging strand
the lagging strand is synthesized continuously, whereas the leading strand is synthesized in
short fragments that are ultimately stitched together
the leading strand is synthesized by adding nucleotides to the end of the growing strand, and
the lagging strand is synthesized by adding nucleotides to the end
the leading strand is synthesized in the same direction as the movement of the replication fork,
and the lagging strand is synthesized in the opposite direction - Answer the leading strand is
synthesized in the same direction as the movement of the replication fork, and the lagging
strand is synthesized in the opposite direction
A new DNA strand elongates only in the 5' to 3' direction because _____.
replication must progress toward the replication fork
DNA polymerase can add nucleotides only to the free 3' end
DNA polymerase begins adding nucleotides at the 5' end of the template
the polarity of the DNA molecule prevents addition of nucleotides at the 3' end - Answer DNA
polymerase can add nucleotides only to the free 3' end
DNA is synthesized through a process known as _____.
