Genetics - Section 1 Multiple Questions and Answers.




21.Which of the following double-stranded DNA molecules would denature at about the same temperature as the double-stranded molecule containing a 5’-(GA)20-3’ strand?
A. a molecule which contains a (GC)20 strand
B. a molecule which contains a (TA)20 strand
C. a molecule which contains a (GACT)10 strand
D. a molecule which contains a (GGGA)10 strand

22.Which characteristic will be shared when comparing the single 5’-(GA)20-3’ strand to another single-stranded DNA molecule with the sequence 5’-(AT)20-3’?
A. Both contain a palindromic sequence
B. Both can form the same secondary structures.
C. Both could hybridize to the same RNA molecule.
D. Both will have the same overall charge.

23.Which of the following experimental results, if obtained, would be evidence against proteins being the genetic material?
A. The viral components labeled with 35S are found inside the bacterial cell during a successful infection
B. The viral components labeled with 32P are found outside the bacterial cell during a successful infection.
C. The transforming factor isolated from a virulent bacterium is resistant to proteases.
D. The transforming factor isolated from a virulent bacterium is resistant to deoxyribonucleases.

24.Assume that DNA molecules are studied in a variety of organisms and found to have the following properties. Which property would be consistent with the hypothesis that genetic material is composed o
A. DNA in all organisms is composed of the same nucleotides.
B. DNA in an organism remains constant as the organism ages.
C. DNA from two different organisms has the same base composition.
D. DNA is different in two different cells of the same organism.

25.A new virus, virus X, is isolated and studied. Which molecule is most likely to be the genetic material of virus X?
A. a linear DNA molecule containing 10,000 base-pairs
B. a linear RNA molecule containing plasmids
C. a circular DNA molecule containing nucleosomes
D. a circular RNA molecule with a molecular weight of 10 billion

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