Horses and donkeys mate successfully to produce mules, which are always sterile. Which genetic isolating mechanism is involved here to prevent horses and donkeys from becoming a single species?
A) gametic isolation B) hybrid infertility
C) behavioral isolation D) mechanical isolation
Answer: B
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In the lab you isolate a Chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A. No, light absorbed by xanthophylls is not used to make ATP or NADPH. B. No, the xanthophylls prevent the production of reactive oxygen species. C. Yes, the xanthophylls prevent the production of reactive oxygen species. D. Yes, the heat released by the xanthophylls would warm up the cells and enhance photosynthesis. E. No, mutations never spread in nature.
You are studying reproduction in a species of frog. Say there was a mistake in meiosis such that all the gametes produced by two individuals are diploid rather than haploid. Two of these gametes fuse. This zygote is:
A. haploid. B. diploid. C. tetraploid. D. octoploid.
Most viruses form a capsid around their nucleic acid core. This capsid is composed of
A. proteins. B. monosaccharides. C. glycoproteins. D. lipoproteins.
The ____________ gland in the neck produces several important hormones, including thyroxine, triiodothyronine, and calcitonin.
Fill in the blank(s) with the appropriate word(s)