Some tRNAs have the ability to pair with different codons due to imprecise base pairing with the third base in the codon. How is this ability described?
a. by degeneracy
b. by exon shuffling
c. by the wobble hypothesis
d. by alternative splicing
Ans: c. by the wobble hypothesis
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Which of the following is true of the life cycle of mosses?
A) The haploid generation grows on the sporophyte generation. B) Spores are primarily distributed by water currents. C) Antheridia and archegonia are produced by gametophytes. D) The sporophyte generation is dominant. E) The growing embryo gives rise to the gametophyte.
In nature, most animals have young during seasons of abundant food. The timing of these events are
dictated by environmental cues and
a. metabolism. b. endocrine activity. c. catabolism. d. ecological events. e. thermodynamics.
The effects of nerve gas prevent the removal of acetylcholine from synapses by interfering with its ____
a. diffusion away from the synaptic cleft b. enzymatic degradation c. active pumping back into the neuron d. binding to its respective receptor e. ability to flux ions across the membrane of the receiving neuron
Which of these makes determining the evolutionary relatedness of different species based on the amino acid sequence of homologous proteins generally less accurate than determinations of relatedness based on the nucleotide sequences of homologous genes?
A) Silent mutations B) Gene duplications C) Translocation events that change gene sequences D) Crossing-over E) Independent assortment