Following a nerve impulse, what triggers the opening of plasma membrane voltage-gated Ca2+ channels?
a) membrane hypopolarization
b) binding of an appropriate ligand
c) membrane depolarization
d) binding of K+ ions
e) membrane hyperpolarization
Ans: c) membrane depolarization
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Rabbit muscle myosin will bind to actin from an amoeba. How can this be?
A. The myosin from amoeba and rabbits is similar due to a distant common ancestor. B. The differences in myosin between amoeba and rabbits are not seen in the actin binding site of myosin. C. Proteins are more likely to change in nonfunctional areas. D. The myosin from amoeba and rabbits is similar due to a distant common ancestor, and the differences between them are not seen in the actin binding site. E. All of the answer options are all correct.
Minerals required for bone formation include
A) zinc and potassium. B) calcium and sodium. C) calcium and phosphorus. D) calcium and zinc. E) iron and sodium.
Which of the following describes the function of the ribosome in a living cell?
a) production of ATP molecules from energy in nutrient molecules b) Disposal and recycling of damaged or unneeded cell parts c) Use of genetic information to build specific protein molecules d) regulation of molecules entering and leaving the cell
Watson and Crick's model of the structure of DNA was published in:
A) 1975. B) 1949. C) 1961. D) 1923. E) 1953.