CHAPTER 14: The fact that whales have pelvic and leg bones indicates what?
(A) they probably evolved from fish.
(B) ancestral whales had legs.
(C) whales should have functional legs.
(D) having a pelvis is advantageous.
(E) whales did not evolve by natural selection.
Ans: (B) ancestral whales had legs.
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What is unusual about the 5' cap found on almost all eukaryotic mRNAs?
A. The nucelotide added is a guanine methylated at N7 and the bond is created between the phosphate group on the guanine and the phosphate on the terminal nucleotide B. The nucelotide added is a guanine methylated at N7 and the bond is a typical phosphodiester bond with the terminal nucleotide C. The nucelotide added is anadenine methylated at N7 and the bond is created between the phosphate group on the guanine and the phosphate on the terminal nucleotide D. The nucelotide added is an adenine methylated at N7 and the bond is typical phosphodiester bond with the terminal nucleotide
If the nucleotide sequence, ACTGAG,
represents the sticky end of a DNA molecule, to what other nucleotide sequence would it “stick”?
a. TGACTC b. UGACUC c. ACTGAG d. ACUGUG e. GAGTCA
Ultraviolet light has a specific effect on the DNA molecule. It causes the formation of
a. thymine dimers. b. translocations. c. deletions. d. inversions. e. duplications.
Which of the following bacterial genera is used for the degradation of environmental pollutants?
A) Actinomyces B) Streptomyces C) Corynebacterium D) Rhizobium E) Nocardia