Following several days of nausea and fatigue, Jackie has become jaundiced and her urine is very dark-colored. Tests ordered by her physician have confirmed that she has hepatitis A. Which of the following is most likely to shorten the duration and lessen the severity of her symptoms?
A. Interferon therapy
B. Treatment with acyclovir
C. Administration of the HAVRIX vaccine
D. Administration of pooled human immune serum globulin
Answer: D
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In the figure above, which of the following survivorship curves implies that an animal may lay many eggs, of which a regular number die each year on a logarithmic scale?
A) curve A B) curve B C) curve C
Jacob von Uexkell used the term Umwelt to explain that animals living in ____ can experience ____ sensory worlds
a. the same place at the same time; identical b. the same place at the same time; different c. different places at different times; identical d. different places at different times; identical e. different places at the same time; different
The free energy from the redox reactions in the electron transport chain drives proton pumps that create a hydrogen ion concentration and electrical gradient across the inner mitochondrial membrane. If these ions cannot readily diffuse, how do they pass back through the inner mitochondrial membrane?
a. Aquaporins in the membrane release the hydrogen ions back into the mitochondrial matrix. b. The complexes of the electron transport chain reverse direction in response the gradient pressures. c. They return through an integral membrane protein called ATP synthase which utilizes the potential energy of the gradient to make ATP. d. They are shuttled back across the membrane by molecular shuttles such as NADH and FADH2.
Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____.
a. facilitated diffusion b. active transport c. simple diffusion d. endocytosis e. exocytosis