Fall leaf color on deciduous trees is a result of
A. the production of more accessory pigments because of the cooler temperatures.
B. cessation of chlorophyll production, which allows the accessory pigments to be revealed.
C. the increased angle of the sun during the fall, which reflects more of the accessory pigments.
D. the reduction in the production of accessory pigments.
Answer: B
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A newly described bacterial species has been shown to use CO2 as its carbon source. Its energy source and its source of reducing power (electrons) are inorganic chemicals. Which term would best describe this nutritional type?
A. Chemolithoheterotroph B. Photolithoheterotroph C. Photoorganoheterotroph D. Chemolithoatotroph
Which of the following is/are true about natural selection?
A. It assures the survival of every fit individual. B. It acts on genotypes rather than phenotypes. C. It always selects for more complex forms. D. On average, it favors the survival of individuals that have adaptive characteristics. E. All of the answer choices are correct.
What percentage of the earth's land area is currently used for crops or permanent pastures?
A) 1% B) 2% C) 5% D) 10% E) 35%
Which of the following is required for the secretion of neurotransmitters in response to an action potential?
(a) neurotransmitter receptors (b) Na+-K+ pumps (c) voltage-gated K+ channels (d) voltage-gated Ca2+ channels