The force driving simple diffusion is _____, while the energy source for active transport is _____

A) the concentration gradient; ADP
B) the concentration gradient; ATP
C) transmembrane pumps; electron transport
D) phosphorylated protein carriers; ATP


Answer: B

Biology & Microbiology

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Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The flower color trait in radishes is an example of which of the following?

A) a multiple allelic system B) sex linkage C) codominance D) incomplete dominance

Biology & Microbiology

Enzyme induction occurs

A) when the substrate is present. B) when the organism is environmentally stressed. C) continuously. D) when the substrate is depleted.

Biology & Microbiology

Some plants require water for reproduction. This is because

a. it is needed for germination of the spores. b. the eggs would dry out otherwise. c. the sperm are motile and need to swim to the egg to accomplish fertilization. d. the plants must be actively growing in order to reproduce. e. the seeds will be carried on the water to new sites.

Biology & Microbiology

Which bone forms the lower sides of cranium and surrounds the ear canal?

a. frontal b. mandible c. sphenoid d. temporal e. occipital

Biology & Microbiology