Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component?
A) RNA ? DNA ? RNA ? protein
B) DNA ? RNA ? protein
C) protein ? RNA ? DNA
D) DNA ? tRNA ? mRNA ? protein
Answer: B
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Some microbial proteins are spliced after translation in a reaction that results in removal of one or more internal intervening sequences called exteins.
Answer the following statement true (T) or false (F)
A fly's wings flap when ________
a. muscles in the wings contract and relax b. blood surges into and out of the wings c. muscles in the thorax contract and relax, changing its shape d. muscles contract against a hydrostatic skeleton
An unrooted tree containing four unrelated species can become rooted by adding ________.
A. an unrelated outgroup B. a descendant related to only one of the species C. a distantly related outgroup D. a descendant group related to two of the species
Alternation of generations is found in some
A. fish. B. tapeworms. C. jellyfish. D. insects.