Bio 1009 quiz 10
If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?
40%
A space probe returns with a culture of a microorganism found on a distant planet. Analysis shows that it is a carbon-based life-form that has DNA. You grow the cells in 15N medium for several generations and then transfer them to 14N medium and grown them for another generation. Which pattern in the figure shown below would you expect if the DNA was replicated in a conservative manner?
B
Which of the following shows the correct base pairing of deoxyribonucleotides that occurs in nature?
G with C
A chromosome is
a single long DNA molecule plus the proteins with which that DNA molecule is complexed
Which of the following statements describes the eukaryotic chromosome?
It consists of a single linear molecule of double-stranded DNA plus proteins.
What is meant by the description "antiparallel" regarding the strands that make up DNA?
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
What is "chromatin"?
The combination of DNA and proteins that forms chromosomes
Which of the following are NOT components of a nucleotide?
an "R" group
The formation of hydrogen bonds between complementary nucleotides is known as
base pairing
According to the "semi-conservative" model of DNA replication, after a double-stranded DNA molecule is replicated
each of the two resulting double-stranded DNA molecules will consist of one "daughter" and one "parental" DNA strand
The two strands of a double-stranded DNA molecule are held together by
hydrogen bonds between complementary nitrogenous bases
The DNA molecule is able to carry a vast amount of hereditary information in which of the following?
sequence of bases
What would be the sequence of the DNA molecule made by replication of the DNA molecule shown below? 5' GCGAATA 3'
5' TATTCGC 3'
A new DNA strand elongates only in the 5' to 3' direction because
DNA polymerase can only add nucleotides to the free 3' end.
Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following?
DNA polymerases can only add deoxyribonucleotides to the 3' end of an existing nucleotide chain
Which of the following shows the correct base pairing of ribonucleotides that occurs in nature?
U with A
Which of the following would you expect of a eukaryote lacking telomerase?
a reduction in chromosome length in gametes
Which of the following statements regarding DNA polymerases is TRUE? a. DNA polymerases can add nucleotides to the 3' end of an RNA molecule b. DNA polymerases can NOT initiate synthesis of a new deoxyribonucleotide chain c. all of these statements are true CorrectGood work! d. DNA polymerases can only add nucleotides to the 3' end of a nucleotide chain
all of these statements are true
Which of the following enzymes initiates the synthesis of a new nucleotide chain during DNA replication?
primase
The leading and the lagging strands differ in that
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.
