The membrane-bound enzyme system that restores and maintains the resting membrane potential is
which of the following pumps?
a. sodium-phosphorus
b. sodium-potassium
c. sodium-chlorine
d. phosphorus-calcium
e. phosphorus-chlorine
B
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NADPH contains the pentose sugar ________ and the nitrogenous base ________.
A) glucose; thymine B) deoxyribose; cytosine C) deoxyribose; nicotinamide D) ribose; adenine E) ribose; nicotinamide
Evidence from Stanley Miller's experiments and evidence from carbonaceous chondrites collected from meteorites, taken together, most directly support the contention that
a. life can arise under conditions of extreme heat or cold. b. organic molecules can be synthesized by natural chemical processes. c. life did not arise on earth, but rather arrived from another planet by meteorite. d. living organisms are required to produce complex organic compounds. e. organic compounds require gravity for their formation.
Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. the number of chromosomes allotted to each daughter cell must be split in fourths.
The impact of a large meteorite with Earth would have most likely caused mass extinctions by
A. causing a great prolonged rise in the earth's temperature and destroying plant life. B. creating large clouds of dust that blocked out sunlight only. C. causing a great prolonged rise in the earth's temperature only. D. creating large clouds of dust that blocked out sunlight and destroying plant life. E. destroying plant life on Earth only.