A Substance Moves by Facilitated Diffusion into a Cell

question 34

Multiple Choice

A substance moves by facilitated diffusion into a cell.What is required for its transport?

• A)ATP only
• B)a pump
• C)both ATP and a protein channel
• D)either a protein channel or a carrier protein

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Definitions:

Carrier

A person who carries and transmits characteristics but does not exhibit them.

Recessive Gene

A genetic trait that is expressed only when two copies of the gene are present, often overshadowed by a dominant counterpart.

Sickle Cell

A genetic blood disorder that results in red blood cells assuming a sickle shape, leading to problems such as pain, infections, and anemia.

Recessive Gene

A type of gene that is not expressed in the phenotype unless two copies of the gene (one from each parent) are present.