Over the past 100 million years, species richness has declined for gymnosperms and has increased for angiosperms
Indicate whether the statement is true or false
TRUE
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Which of the following is TRUE of fertilization?
A. It restores the egg to a diploid state. B. It activates cell division. C. It is critical to maintaining membrane polarity. D. It both restores the egg to a diploid state and activates cell division. E. It both restores the egg to a diploid state and maintains membrane polarity.
Which structure acts as a "release valve" for the force of the pressure waves entering the cochlea?
a. the round window b. the oval window c. the Eustachian tube d. the organ of Corti e. the tectorial membrane
A CO2 gradient between the inside and outside of a leaf is maintained during photosynthesis because
A) energy is expended by the plant to maintain the CO2 gradient. B) the CO2 concentration outside of the leaf is always increasing. C) the CO2 concentration in the mesophyll is constantly decreasing. D) the stomata close whenever more CO2 is needed.
Suppose that a person is on a diet of primarily grains. Which two amino acids would such a diet likely be deficient in?
a. valine and lysine b. methionine and lysine c. isoleucine and lysine d. methionine and tryptophan