Which of the following are used by cyanobacteria for reproduction?
A. Fragmentation
B. Binary fission
C. Budding
D. All of the choices are correct.
Answer: D
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In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. archenteron B. neural tube C. notochord D. epidermis E. intestinal tract
A human population living without medical care in a developing country would probably have ____
a. a rectangle-shaped age structure diagram b. an r value < 0 c. a pyramid-shaped age structure diagram d. per capita birth and death rates consistent with those of a stage 4 society e. no density dependent factors operating
NADPH is made by
A. the Krebs cycle. B. glycolysis. C. chemiosmosis. D. the Calvin cycle. E. the passing of electrons from photosystem I to an electron transport chain.
Suppose a plant had a photosynthetic pigment that absorbed far-red wavelengths of light. In which of the following environments could that plant thrive?
A) on the surface of a lake B) on the forest floor, beneath a canopy of taller plants C) on the ocean floor, in very deep waters D) on mountaintops, closer to the Sun