The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its
A. conformation.
B. amino acid sequence.
C. net charge.
D. solubility.
E. immunity.
A
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Which of the following does not inhibit protein synthesis?
A. Tetracycline B. Erythromycin C. Streptomycin D. Penicillin E. All of the choices inhibit protein synthesis.
Four of the five answers are traits that Homo sapiens had compared to earlier species. Select the exception
a. smaller teeth and facial bones. b. a more prominent chin. c. a higher and rounder skull. d. the capacity for spoken language. e. shorter body form.
A plant secretes ____ when it needs to respond
defensively to a pathogen. a. salicylic acid b. systemin c. brassinosteroids d. mineralocorticoids e. nitric oxide
In humans ventilation is powered by
a. the diaphragm only. b. muscles attached to the ribs only. c. the lungs themselves. d. the diaphragm and rib muscles. e. the heart.