Which of the following consists of more than just proteins?

a. cytoskeleton
b. receptor
c. cell membrane
d. enzyme (not a ribozyme)

A. Cell membrane

Explanation: Cell membrane is a biological lipid bilayer that separates the interior part of every cell from its exterior. The main components of cell membrane include lipids, proteins and carbohydrate moieties that are attached to either lipids or proteins.

Cytoskeleton contains series of intercellular proteins that gives shape and provides support to a cell. Enzymes are proteins that catalyze biological reactions. Receptors are proteins found mostly on the surface of a cell.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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