Which Is True About Mediated Transport of Substances Across Cell

question 16

Multiple Choice

Which is true about mediated transport of substances across cell membranes?

• A)It involves a specific membrane protein that functions as a carrier molecule.
• B)It always involves the movement of substances against a concentration gradient.
• C)It is always directly coupled to the splitting of ATP molecules.
• D)There is no limit to how fast it can occur as the concentration gradient becomes larger.
• E)It is the main mechanism for transporting hydrophobic molecules across membranes.

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Definitions:

Gametophyte

The sexual phase in the life cycle of plants and algae that produces gametes, typically through mitosis.

Spores

Asexual reproductive or resting cells capable of developing into a new organism without fusion with another cell, often seen in bacteria, fungi, and plants.

Haploid Spores

Single-celled reproductive units produced by plants, fungi, and some protozoa that contain only one set of chromosomes, leading to genetic diversity.

Capsule

A form of glycocalyx that consists of a gelatinous layer; found in blue-green algae and certain bacteria.