What step in DNA replication precedes the pairing of complementary bases?
a. polymerization of DNA
b. separation of the two strands
c. joining of the two strands
d. mitotic division
e. formation of the histone core
B
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Which of the following is not a function of the Drosophila Sxl protein?
A. prevention of the splicing machinery from recognizing the splice junctions of the E1 or L3 exons of the Sxl mRNA B. mediation of alternative splicing that produces transcripts for functional Tra protein C. binding specifically to the regulated 3' splice site of the tra transcript D. mediation of the splice variant of the dsx transcript leading to repression of female-specific genes
To date, there are not any indications that transposable elements offer a selective advantage to a species
Indicate whether the statement is true or false
The Miller and Urey apparatus produced hydrogen cyanide (HCN), formaldehyde (CH2O), and glycine (an amino acid) in their first experiment, why was it important that they use water vapor, methane, carbon monoxide, ammonia and hydrogen as their reactants and an electrical spark as their energy source?
A. They knew these reactants were available in their lab and in today's atmosphere.
B. These reactants were found in today's atmosphere therefore they should be used to try to replicate the early Earth atmosphere.
C. Each of the reactants were readily changed into proteins and DNA.
D. These reactants were useful because their products were able to be predicted before the experiment began, it is always good to know the outcome of an experiment to achieve success with the experiment.
E. These reactants were hypothesized to have made up the early Earth atmosphere, the electricity was used to emulate lightening strikes.
Which of the following is NOT a functional
occupation of nucleotides?
a. virus destroyers b. energy carriers c. enzyme helpers d. chemical messengers e. subunits of larger molecules