When insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake, this is an example of ____.
A. autocrine signaling
B. direct intercellular signaling
C. paracrine signaling
D. endocrine signaling
E. contact-dependent signaling
D. endocrine signaling
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Which sequence of events CORRECTLY describes the initiation and elongation steps of translation in prokaryotic cells?
(1) initiator tRNA binds start codon on mRNA (2) small ribosomal subunit binds to mRNA (3) large ribosomal subunit binds (4) tRNA entry and peptidyl transfer reaction (5) translocation of ribosome and release of tRNA A. 1, 2, 3, 4, 5 B. 1, 2, 3, 5, 4 C. 1, 3, 2, 4, 5 D. 2, 3, 1, 5, 4 E. 2, 1, 3, 4, 5
Humans have disrupted the nitrogen cycle primarily by ____
a. irrigation b. cutting down forests c. using nitrogen-containing fertilizers d. crop rotation e. leaching
Research on HIV vaccines is progressing, but success to date has been limited to vaccines that are of limited
effectiveness against a few strains of the HIV virus. However, flu vaccines are similar in their limitations. Why are ‘limited effectiveness flu vaccines released, but not HIV vaccines? What will be an ideal response?
Somatic cell nuclear transfer
a. uses differentiated cells. b. uses stem cells. c. produces human embryos for research d. is used to breed livestock e. does all of these.