The formation and breaking of bonds between atoms requires
a. a chemical reaction.
b. van der Walls forces.
c. partial charges.
d. an empty valence shell.
e. an enzyme.
A
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In regions of a chromosome that encode highly structured RNA molecules, what sequence characteristics would you expect to find?
A. an abundance of pyrimidines, which play an important role in three-dimensional folding of RNA B. an abundance of uracil, which plays an important role in three-dimensional folding of RNA. C. multiple short segments capable of base pairing with adjacent or distant regions of the sequence. D. heavy methylation of these gene sequences, preventing their expression E. very little in the way of sequences that can form double-stranded helices
After a long period of gradual evolution of protein domains, a period of explosive change (the “big bang”) in protein
domain complexity occurred at roughly the same time as the 3 taxonomic domains were undergoing rapid diversification. In which taxonomic domain was this diversification most extensive?
a. Eukarya b. Protista c. Archaea
d. Animalia e. Bacteria
In an autosomal dominant disorder such as Huntington's disease, two carrier parents have the probability of passing
the gene onto ____ percent of their children.
a. 0 b. 25 c. 50 d. 75 e. 100
Short-day plants are those that flower only when the night period of a plant is
A. less than that in summer. B. longer than 12 hours. C. longer than a defined period. D. followed by short periods of light interruptions. E. shorter than 12 hours.