If a short sequence of DNA is 5' AATTGCCGT 3', its complement is
A. 5' AAAACGCCA 3'.
B. 3' TTAAGCCGA 5'.
C. 3' TTAACGGCT 5'.
D. 5' TTAACGGCA 3'.
E. 3' TTAACGGCA 5'.
Answer: E
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Which statement is not true?
(a) Nodes are present on horsetails. (b) The rhizome on horsetails bears roots. (c) The internode of a horsetail is the region where the leaves are attached. (d) Horsetails are members of the subphylum Sphenophyta.
Induction of the lac operon is rapidly reversed because
a. the products of lactose metabolism are corepressors. b. as inducer levels drop, the repressor is rapidly reoriented to the operator. c. its mRNA is rapidly degraded. d. above a certain concentration, the inducer becomes a corepressor. e. there is rapid synthesis of new repressor.
Stacks of cisternae in the Golgi apparatus are referred to as ________.
A. golgisomes B. stigmata C. dictyosomes D. Lamellisomes
A food infection results from the ingestion of exotoxin secreted by bacterial cells.
Answer the following statement true (T) or false (F)