Individuals with Lesch—Nyhan syndrome exhibit
A) urine that turns black when exposed to air.
B) compulsive self-mutilation behaviors.
C) lighter than normal pigmentation of skin, hair, and eyes.
D) severe anemia.
E) a cherry-colored spot on the retina.
B
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One reason that prokaryotic genes do not contain introns is that
A) the introns are cut out during binary fission. B) due to the short time the bacterium is around as a single organism, a 5' cap and poly (A) tail are added immediately for translation to take place. C) bacterial proteins are very short and not subject to mutation. D) translation sometimes begins before transcription has been completed because prokaryotes do not have a nucleus. E) integrated viral DNA is not recognized for transcription.
Which vertebrate organ filters blood, adjust its composition, and produces urine?
a. nephridium b. Malpighian tube c. kidney d. liver e. bladder
Homo habilis may have been the first hominid to:
a. bury its dead. b. use pictorial symbolism. c. use fire for cooking and heating. d. have well-organized family units. e. consciously designed tools
What is the function of melatonin?
A. regulate blood glucose levels B. control the color of the skin C. aid in the differentiation of T lymphocytes D. regulate blood calcium levels E. control the daily sleep-wake cycle