In amino acid monomers, the side group (r) is covalently bound to:
a. the alpha-carbon.
b. the carboxyl carbon.
c. the amino nitrogen.
d. the hydroxyl oxygen.

a. The alpha-carbon

Explanation:

An amino acid is an organic molecule that contains a carboxyl (COOH) and a amino (NH2) group. It has a central carbon called as alpha carbon.

The carboxyl and amino groups are attached to the the alpha carbon. Apart from them, a side chain denoted by "R" is also covalently attached to it. Side chain varies in each amino acid and it imparts the unique properties to the particular amino acid.

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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: d

-charlie

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: d

a- all cells come from pre-existing cells