Cross-fostering experiments with Norway rat pups showed that in their response to stress,
A) environment was the critical factor, not just their genes.
B) genetics was the critical factor, not environment.
C) cross-fostered pups resembled their biological mothers more than their foster mothers.
Answer: A
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The designer of the first transmission electron microscope, ________, was awarded the 1986 Nobel Prize in physics.
Fill in the blank(s) with the appropriate word(s).
Which of the following produces NADPH?
A) the pentose phosphate pathway only B) the Calvin-Benson cycle only C) the Embden-Meyerhof pathway only D) both the Embden-Meyerhof and Calvin-Benson cycle pathways E) both the pentose phosphate and Entner-Doudoroff pathways
The B-I mutation in anthocyanin (red pigments) produces pigmented corn plants, whereas the B? mutation in the same gene usually produces nearly unpigmented corn plants when homozygous (B ´/B ´). When homozygous B-I and B? plants are intercrossed
, the F1 plants are essentially unpigmented, like the B? homozygotes. If this outcome were due simply to the dominance of B? to B-I, then a self-cross of the F1 plants (B ´/B-I) should generate B-Iâ€"colored homozygotes as approximately 1/4 (B-I/B-I) of the F2 progeny. Instead, no F2 are pigmented. Intercrosses of the F2 and of further generations do not restore the pigmented phenotype. What is the term for this type of inheritance? A) Mendelian inheritance B) organelle genome inheritance C) allelic inheritance D) epigenetic inheritance
Control of a physiological state by a negative feedback loop differs from control by a positive feedback loop in that only in the case of negative feedback
a. does the physiological state tend to remain close to constant. b. does an effector respond to change by increasing output. c. is the effector controlled by some form of sensory input. d. is the response likely to be helpful to an organism's fitness. e. c and d.