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The organelle that best enables an athlete’s tissues to be metabolically active are A. ribosomes.B. lysosomes.C. smooth endoplasmic reticulum.D. mitochondria.E. contractile vacuoles.

______________ function in the collection, packaging, and distribution of molecules made in the cell.A) MitochondriaB) RibosomesC) Golgi bodiesD) PeroxisomesE) Vacuole

What type of bonding is likely to occur between two water molecules or strands of DNA? A. covalent B. ionic C. hydrogen D. both hydrogen and covalent E. both hydrogen and ionic

A substance that acts as a reservoir for H+ ions, opposing any increase or decrease in concentration, is a(n) _______. A.buffer B.acid C.base D.antacid

Microfilaments such as actin, microtubules, and the intermediate filaments form the cell-supporting structure called the ______________. A. cytoplasm B. plasma membrane C. cytoskeleton D. centrioles

. ____ is a cell engulfing large solid materials, and ____ is a cell engulfing materials dissolved in solution. A. Endocytosis; exocytosisB. Exocytosis; endocytosisC. Phagocytosis; pinocytosisD. Pinocytosis; phagocytosis

In a thunderstorm, the falling rain creates

What causes hair to stand on end?

Serous membranes _______,

Parallel curving ridges which form fingerprints and footprints