Using sequence data, it has been shown that:
A. humans evolved from the Neanderthals.
B. Homo sapiens arose gradually in many places.
C. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Africa.
D. Homo sapiens arose separately from Homo erectus and Homo neanderthalensis, expanding out of Asia.
E. Homo sapiens evolved from Homo erectus.
Which of the following is nota feature of the DNA helix proposed by Watson and Crick?
A. double-stranded
B. right-handed
C. antiparallel
D. complementary base pairing
E. two grooves of equal dimensions
Which one of the following statements about the incorporation of selenocysteine into proteins is true?
A. Selenocysteine is an example of a posttranslational modification.
B. The tRNA used to translate selenocysteine at a stop codon is first charged with serine.
C. The tRNA used to translate selenocysteine at a stop codon has an anticodon sequence of UGA.
D. The serine bound to the tRNA used to translate selenocysteine at a stop codon is converted to selenocysteine by the enzyme SelB.
Which of the following is not a eukaryotic retrotransposon?
A. gypsy
B. Ty elements
C. LINEs
D. SINEs
E. Tc1/mariner
What method has been used to identify replication origins in bacteria?
What will be an ideal response?
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