The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ________.

A. active transport
B. endocytosis
C. facilitated diffusion
D. diffusion
E. osmosis


Answer: C

Biology & Microbiology

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What results from the chemical reaction illustrated above? The reactants have no charge

A) a cation with a net charge of +1 and an anion with a net charge of +1 B) a cation with a net charge of -1 and an anion with a net charge of -1 C) a cation with a net charge of -1 and an anion with a net charge of +1 D) a cation with a net charge of +1 and an anion with a net charge of -1

Biology & Microbiology

Photosynthetic autotrophs use ________ from the air as a carbon source and ________ as their energy source

Fill in the blank(s) with correct word

Biology & Microbiology

Phosphodiesterase catalyzes the conversion of:

a. IP3 to PIP2. b. GDP to GTP. c. cAMP to AMP. d. calcium to calcium-calmodulin. e. a protein to a phosphorylated protein.

Biology & Microbiology

Sister chromatids separate during anaphase of which of the following?

a. mitosis b. meiosis I c. meiosis II d. Both a and c are correct.

Biology & Microbiology