Molecules that form channels that allow selected molecules to cross the membrane are called

1.recognition proteins.
2.transport proteins.
3.receptor proteins.
4.glycoproteins.
5.cell adhesion proteins.


2

Biology & Microbiology

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A ________ layer consists of diffuse unorganized polysaccharide material that lies outside the cell wall and is easily removed.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following vitamins could be toxic in large amounts?

a. A b. B1 c. B2 d. biotin e. folic acid

Biology & Microbiology

A process by which an organism produces offspring is called _____

Fill in the blank(s) with correct word

Biology & Microbiology

When a finger or other appendage is severed in an accident, it is possible to surgically rejoin most tissues (bone, skin, etc.), which will then grow and heal. However, a cut through an appendage nerve is currently very difficult to reconnect. What structures are severed when the nerves in an appendage are severed?

A. axons B. interneurons C. cell bodies D. synapses E. dendrites

Biology & Microbiology