The rate of background extinctions is calculated to be species per year per million species.
A. 0.1 to 1.0
B. 1.0 to 10
C. 0.001 to 0.01
D. 10 to 100
E. None of the answer choices is correct.
A. 0.1 to 1.0
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During G2, a cell produces ________
a. daughter cells b. the bipolar spindle c. proteins that drive mitosis d. newly synthesized DNA
Refer to the accompanying figure. The structures receiving air in figure 1 are known as:
a. anterior air sacs. b. parabronchi. c. spiracles. d. alveoli. e. tracheae.
Which of the following statements about the light reactions of photosynthesis is FALSE?
A) NADPH becomes oxidized to NADP+. B) Chlorophyll (and other pigments) absorbs light energy, which excites electrons. C) ATP is formed. D) The splitting of water molecules provides a source of electrons. E) An electron transport chain is used to create a proton gradient.
In lipid biosynthesis, glycerol is derived from dihydroxyacetone phosphate formed during
a) the Krebs cycle. b) glycolysis. c) the electron transport chain. d) the Calvin-Benson cycle.