Which of the following describes the most likely order of events in allopatric speciation?
A) genetic drift, genetic isolation, divergence
B) genetic isolation, divergence, genetic drift
C) divergence, genetic drift, genetic isolation
D) divergence, genetic isolation, genetic drift
E) genetic isolation, genetic drift, divergence
Answer: E
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Codons are part of the molecular structure of _____
A) a protein B) mRNA C) tRNA D) rRNA
Which of the following intron groups is matched appropriately with a true statement?
A) Group II introns are removed from mRNA in mammals. B) Group I introns are removed from rRNAs that are found in mitochondria and chloroplasts. C) Spliceosomal introns are removed using large protein-based enzyme complexes. D) Group I introns are removed from rRNAs using large protein-based enzyme complexes. E) Spliceosomal introns are removed using the catalytic ability of the intron itself.
Match the following items with the correct phrases.
_______1. When two microorganisms occupying the same environmental niche have absolutely no effect upon each other, it is known as ____________________. _______2. Bacterial vaginosis is an example of ____________________. _______3. ____________________ is a symbiotic relationship of benefit to one of the symbionts, but neither beneficial nor harmful to the other. _______4. ____________________ is a symbiotic relationship of benefit to one of the symbionts, and detrimental to the other. _______5. A lichen is a classic example of ____________________. a. commensalism b. mutualism c. neutralism d. parasitism e. synergism
With regard to hormones, responses occurring over the shortest distance would be classified as
A) paracrine. B) endocrine. C) autocrine. D) juxtacrine. E) All of the above choices work over similar distances.