Which plant hormone listed below is responsible for the symbiotic relationship shown in the accompanying figure?
a. auxin
b. gibberellin
c. cytokinin
d. jasmonic acid
e. abscisic acid
ANSWER: d
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Endotoxins are released in large amounts only when cells lyse
Indicate whether the statement is true or false.
Malpighian tubules are found in
a. annelids. b. mammals. c. flatworms. d. insects. e. larval mollusks.
Matings between individuals from the two populations of Rhagoletis produce hybrid flies that appear to be healthy and have normal life spans. The eggs laid by these hybrid flies, however, hatch less often than those of flies from either of the two populations. What isolating mechanism seems to be important in this hybrid population?
A) Prezygotic isolation B) Mechanical isolation C) Reduced hybrid fertility D) Habitat isolation
How is the reading frame established during translation?
a. by pairing initiator tRNA with the start codon b. by the first base in the mRNA molecule c. by the first tRNA to bind a codon at the A site d. by removal of the cap from mRNA