Active transport makes it possible for cells to
A) take up nutrients from the environment against concentrations gradients.
B) transport out secretory products and waste material against concentration gradients.
C) maintain nonequilibrium intracellular concentrations of ions such as Na+, K+, Ca2+, and H+.
D) establish an electrical potential across the membrane.
E) All of the above are correct.
Answer: E
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The term antithesis refers to
A) using a key word or phrase more than once for emphasis. B) having two or more clauses or sentences with the same grammatical pattern. C) a sentence that has two parts with parallel structures but contrasting meanings. D) the repetition of consonant sound several times in a phrase,clause,or sentence.
Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules. These attractions are called:
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. double bonds.
Why is iodine considered a trace element that is vital for biological function in humans?
What will be an ideal response?
Rats are responsible for eating or fouling
approximately ____ percent of our total food production.
a. 5 b. 10 c. 15 d. 20 e. 25