Movement of a Molecule Against a Concentration Gradient Is

question 30

Multiple Choice

Movement of a molecule against a concentration gradient is

• A)simple diffusion.
• B)facilitated diffusion.
• C)osmosis.
• D)active transport.
• E)bulk flow.

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Definitions:

Nucleotides

The basic building blocks of DNA and RNA, composed of a nitrogenous base, a sugar, and a phosphate group.

Polymers

Large molecules composed of many repeated subunits, known as monomers, which have a wide array of characteristics and uses in both natural and synthetic forms.

Steroid

Type of lipid molecule having a complex of four carbon rings—e.g., cholesterol, estrogen, progesterone, and testosterone.

Lipid Molecule

Organic molecules that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents.