Question

14) An example of a purine is A) thymine. B) guanine. C) deoxyribose. D) cytosine. E) ribose 5-phosphate. 15) Which of the following statements regarding the Watson-Crick model of DNA is false? A) It is the most common biological form of DNA. B) The two DNA strands form a left-handed helix. C) The two DNA strands are antiparallel. D) The bases are "stacked" in the center of the molecule. E) The backbone consists of alternating sugars and phosphates. 16) Circular DNA molecules found in nature are A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the Z-DNA formation. 17) In practice, the unit of length used for DNA is the kilobase pair, which corresponds to a) 10 base pairs b) 100 base pairs c) 1000 base pairs d) 1,000,000 base pairs 18) The melting temperature (Tm) of DNA is: A) the temperature at which half the bases in a double-stranded DNA sample have denatured. B) the temperature at which half the bases in a single-stranded DNA sample have renatured. C) the temperature at which half the phosphodiester bonds in a double-stranded DNA sample have broken. D) the temperature at which all the bases in a double-stranded DNA sample have denatured. 19) Which of the following statements is true regarding mitochondrial and chloroplast genomes? A) They contain mostly interspersed and tandemly repeated DNA. B) They are able to replicate independently of the nuclear DNA. C) They contain all the genes necessary for aerobic respiration. D) They are degenerate bacterial genomes that don't contain important protein-coding genes. E) They only encode for ribosomal and transfer RNAs. 20) Mitochondrial and chloroplast genomes typically A) are composed of primarily noncoding DNA. B) encode all of the proteins needed for aerobic respiration and photosynthesis, respectively. C) encode for ribosomal and transfer RNAs. D) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively. E) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively, as

          14) An example of a purine is
A) thymine.
B) guanine.
C) deoxyribose.
D) cytosine.
E) ribose 5-phosphate.

15) Which of the following statements regarding the Watson-Crick model of DNA is false?
A) It is the most common biological form of DNA.
B) The two DNA strands form a left-handed helix.
C) The two DNA strands are antiparallel.
D) The bases are "stacked" in the center of the molecule.
E) The backbone consists of alternating sugars and phosphates.

16) Circular DNA molecules found in nature are
A) positively supercoiled.
B) negatively supercoiled.
C) not supercoiled, due to their small size.
D) always oriented in a triple helix to conserve space.
E) always in the Z-DNA formation.

17) In practice, the unit of length used for DNA is the kilobase pair, which corresponds to
a) 10 base pairs
b) 100 base pairs
c) 1000 base pairs
d) 1,000,000 base pairs

18) The melting temperature (Tm) of DNA is:
A) the temperature at which half the bases in a double-stranded DNA sample have denatured.
B) the temperature at which half the bases in a single-stranded DNA sample have renatured.
C) the temperature at which half the phosphodiester bonds in a double-stranded DNA sample have
broken.
D) the temperature at which all the bases in a double-stranded DNA sample have denatured.

19) Which of the following statements is true regarding mitochondrial and chloroplast
genomes?
A) They contain mostly interspersed and tandemly repeated DNA.
B) They are able to replicate independently of the nuclear DNA.
C) They contain all the genes necessary for aerobic respiration.
D) They are degenerate bacterial genomes that don't contain important protein-coding genes.
E) They only encode for ribosomal and transfer RNAs.

20) Mitochondrial and chloroplast genomes typically
A) are composed of primarily noncoding DNA.
B) encode all of the proteins needed for aerobic respiration and photosynthesis, respectively.
C) encode for ribosomal and transfer RNAs.
D) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively.
E) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively, as

14) An example of a purine is
A) thymine.
B) guanine.
C) deoxyribose.
D) cytosine.
E) ribose 5-phosphate.

15) Which of the following statements regarding the Watson-Crick model of DNA is false?
A) It is the most common biological form of DNA.
B) The two DNA strands form a left-handed helix.
C) The two DNA strands are antiparallel.
D) The bases are "stacked" in the center of the molecule.
E) The backbone consists of alternating sugars and phosphates.

16) Circular DNA molecules found in nature are
A) positively supercoiled.
B) negatively supercoiled.
C) not supercoiled, due to their small size.
D) always oriented in a triple helix to conserve space.
E) always in the Z-DNA formation.

17) In practice, the unit of length used for DNA is the kilobase pair, which corresponds to
a) 10 base pairs
b) 100 base pairs
c) 1000 base pairs
d) 1,000,000 base pairs

18) The melting temperature (Tm) of DNA is:
A) the temperature at which half the bases in a double-stranded DNA sample have denatured.
B) the temperature at which half the bases in a single-stranded DNA sample have renatured.
C) the temperature at which half the phosphodiester bonds in a double-stranded DNA sample have
broken.
D) the temperature at which all the bases in a double-stranded DNA sample have denatured.

19) Which of the following statements is true regarding mitochondrial and chloroplast
genomes?
A) They contain mostly interspersed and tandemly repeated DNA.
B) They are able to replicate independently of the nuclear DNA.
C) They contain all the genes necessary for aerobic respiration.
D) They are degenerate bacterial genomes that don't contain important protein-coding genes.
E) They only encode for ribosomal and transfer RNAs.

20) Mitochondrial and chloroplast genomes typically
A) are composed of primarily noncoding DNA.
B) encode all of the proteins needed for aerobic respiration and photosynthesis, respectively.
C) encode for ribosomal and transfer RNAs.
D) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively.
E) encode some of the proteins needed for aerobic respiration and photosynthesis, respectively, as

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