Identify the key feature of the action potential that ensures it will travel only one direction.
A. the activation state of the voltage-gated Na+ channel
B. the temporary cessation in activity of the Na+/K+ pump
C. the inactivation state of the voltage-gated K+ channel
D. the activation state of the voltage-gated K+ channel
E. the inactivation state of the voltage-gated Na+ channel
Answer: E
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How does the size of fungal hyphae contribute to their ability to decompose detritus?
A. Fungal hyphae have a low ratio of surface area to volume, so they are able to absorb more nutrients. B. Fungal hyphae have high ratio of surface area to volume, so they are able to absorb more nutrients. C. Fungal hyphae have a low ratio of surface area to volume, so they are able to secrete more digestive enzymes into the surrounding environment to break down detritus. D. Fungal hyphae have a high ratio of surface area to volume, so they are able to secrete more digestive enzymes into the surrounding environment to break down detritus.
In mammalian defenses against invading pathogens, all of these are considered nonspecific defense mechanisms EXCEPT
A. acquired immunity. B. the skin. C. mucous membranes. D. the inflammatory response. E. antimicrobial proteins (e.g., interferon).
What is the current status of the Human Genome Project? What will be an ideal response?
DNA seen in nucleus and
a. lysosomes b. golgi bodies c. mitochondria