According to the redundancy hypothesis, species are redundant if
A. they have an effect on the ecosystem that is disproportionate with their abundance.
B. they could be eliminated or replaced by others with no loss of ecosystem function.
C. their ecological niche overlaps somewhat with another species.
D. they have grown beyond their carrying capacity for a particular ecosystem.
Answer: B
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The head of a sperm contains the
A) cell membrane. B) cytoskeleton. C) DNA. D) testosterone.
Would you recommend a couple in which the male is infertile to seek genetic counseling? Why or why not? What will be an ideal response?
In organisms growing by respiration, NADH and FADH2 produced during glycolysis and the CAC are reoxidized by
a. fermentation of pyruvate. b. the electron transport chain. c. fermentation of citric acid. d. gluconeogenesis.
What was LUCA?
a. the first life-form b. the only life-form present before our current lineage c. the last universal ancestral life-form, a single individual d. a population of life-forms that was the last common ancestor of life on Earth today