Microscopic examination of a patient's fecal culture shows spiral bacteria. The bacteria probably belong to the genus
A) Campylobacter jejuni.
B) Escherichia coli.
C) Salmonella typhi.
D) Shigella spp.
E) Vibrio cholerae.
A
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Catabolite activator protein:a
increases the affinity of the promoter region for RNA polymerase. b. decreases RNA polymerase activity. c. becomes nonfunctional when it binds to AMP. d. binds and activates RNA polymerase. e. blocks RNA polymerase access to the DNA template
A person who produces anti-A and anti-B serum antibodies will have blood type ________.
A. B B. O C. AB D. A E. Rh
The segmental arrangement of spinal nerves exiting the spinal column produces specific patterns of dermatomes (sensory distribution) and myotomes (motor distribution), which are very useful in clinical examination.
a. true b. false
Evolutionary adaptations that help diverse animals directly exchange matter between cells and the environment include _____
A) a gastrovascular activity, a two-layered body, and a torpedo-like body shape B) an external respiratory surface, a small body size, and a two-cell-layered body C) a large body volume, a long, tubular body, and a set of wings D) an unbranched internal surface, a small body size, and thick covering