The three-base sequence on DNA that codes for an amino acid is called a/an ________.
A. triplet
B. intron
C. anticodon
D. codon
E. exon
Answer: A
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Fire in the dry shrublands does not kill the small
bushy plants most probably because a. these plants have a tough protective bark. b. their leaves are very heavy and wet. c. they can resprout from root crowns. d. the Forest Service puts the fires out quickly. e. the fires burn the taller plants and burn out before reaching ground level.
The hormone prolactin, found in distantly related vertebrates, exerts different effects in different species. From an evolutionary standpoint, this is an indication that prolactin
A) can only have functions related to childbirth. B) is an ancient hormone whose function diversified through evolution. C) was a recent evolutionary adaptation. D) was not required in fish and amphibians.
The fact that energy transformations increase the amount of entropy is the basis of which of the following?
a. cell theory b. first law of thermodynamics c. second law of thermodynamics d. oxidation-reduction reactions
Please match the description to the pattern of infection.
A subsequent infection with a different microbe that may occur following an initial infection A) Acute infection B) Systemic infection C) Localized infection D) Chronic infection E) Secondary infection