Clara has alkaptonuria. Her symptoms include back spasms, dark urine, arthritis, hearing loss, kidney stones, heart valve damage, and darkened ear tips. This condition is therefore
A) genetically heterogenic.
B) pleiotropic.
C) dominant.
D) epistatic.
B) pleiotropic.
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Which of the following is the most serious toxin involving acetylcholine?
a. Botulinum b. Prairie rattlesnake venom c. Hemicholinium-3 (HC-3) d. Black widow spider venom
In the pairing of two nucleotides within the double helix,
a. hydrogen bonds are used. b. adenine and thymine bind together. c. cytosine binds with guanine. d. there are three bonds between G and C. e. all of these
This procedure involves the cutting and tying off of the oviducts.
A. tubal ligation B. vasectomy C. C-section D. contraception
Speciation often occurs when a habitat becomes more heterogeneous. In Lake Victoria different species of cichlids are found in different areas of the lake. The best explanation for this speciation is that
A) natural selection favored different heritable variations in different parts of the lake. B) male cichlids that lived in deep water needed to be seen by females, so they became colorful. C) food was scarce in the lake, so some fish had to learn how to scrape algae, some had to learn to eat insects, and some had to learn to bite leaves. D) humans selected for many different traits in cichlids in order to market them to the aquarium trade.