How did Darwin develop his theory of evolution?
A. Experimentation.
B. Statistical analysis.
C. Both experimentation and observation.
D. Observation.
Answer: D
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In the sweet pea crossing experiment by Bateson and Punnet, the F2 generation had many more offspring with the phenotypes of purple flowers P, long pollen L and red flowers p, round pollen l than expected from independent assortment. This is because
A. In these sweet peas, there are always more PL gametes than there are pl gametes. B. In sweet peas, the alleles for flower color and pollen shape are on the same chromosome. C. There were few recombination events between these genes during meiosis. D. Flower color and pollen shape are within the same linkage group. E. All of these are correct.
At one point in human development, tissue connects the fingers, giving the hand a “webbed” appearance. Enzymes
eventually destroy the cells of the webbing and the fingers separate. These enzymes are probably localized in the ____.
a. chromosomes b. smooth endoplasmic reticulum c. lysosomes d. nucleus e. vacuoles
Excitatory postsynaptic potentials are generally caused by _______channels opening, while inhibitory postsynaptic potentials may be caused by _______ channels opening.
a. Na+; Cl– b. K+; Cl– c. Ca2+; K+ d. Cl–; K+
Compared to uric acid, using urea as the main form of nitrogenous waste requires
a. more energy and water. b. less energy and water. c. more energy and less water. d. the same amount of energy and water. e. less energy and more water.