All of the following are necessary for contraction to occur EXCEPT which one?
A) Calcium levels must increase in close proximity to the contractile proteins.
B) ATP must be present.
C) Troponin-tropomyosin complex must shift out of the way.
D) Cross-bridges must form between actin and myosin.
E) The troponin and tropomysin must slide relative to each other, shortening the sarcomere.
E
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Despite great diversity, all vertebrates share which basic homeostatic mechanism(s)?
a. digestion only b. metabolism only c. respiration only d. digestion and metabolism e. digestion, metabolism and respiration
What are some challenges land plants face compared to life in the water?
A. Obtaining resources from the air and soil instead of from water B. Obtaining and retaining moisture C. Staying upright against the pull of gravity D. All of the above are challenges faced by land plants.
Does the ratio of carbon to hydrogen convey any structural information?
a. yes b. no
Acyclovir is used to treat
A. influenza A virus. B. respiratory syncytial virus. C. shingles, chickenpox, and genital herpes. D. HIV. E. hepatitis C virus.