Question 1

Use the following to answer the questions below:
Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all.

-Only standard amino acid that participates in disulfide bonds

Accepted Answer

Cysteine is the only standard amino acid that has a thiol group (-SH) in its side chain, which can form disulfide bonds with another cysteine residue.

Question 2

Use the following to answer the questions below:
Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all.

-Only standard amino acid with a methyl group attached to its alpha carbon atom

Accepted Answer

Alanine is the only standard amino acid with a methyl group attached to its alpha carbon atom.

Question 3

Use the following to answer the questions below:
Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all.

-Only standard amino acid whose side chain does not contain carbon

Accepted Answer

The only standard amino acid whose side chain does not contain carbon is glycine. Proline has a cyclic structure with a side chain containing carbon, cysteine has a sulfur-containing side chain, and alanine has a methyl group as a side chain.

Question 4

Use the following to answer the questions below:
Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all.

-Only standard amino acid that is achiral

Accepted Answer

Glycine is the only standard amino acid that is achiral, meaning it does not have a stereocenter and therefore does not have a mirror image that is not superimposable. Proline, cysteine, and alanine all have stereocenters and thus have non-superimposable mirror images.

Question 5

Use the following to answer the questions below:
Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all.

-Only standard amino acid with a cyclic side chain

Accepted Answer

Proline is the only standard amino acid with a cyclic side chain.

Quiz 20: Proteins

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid that participates in disulfide bonds

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid with a methyl group attached to its alpha carbon atom

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid whose side chain does not contain carbon

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid that is achiral

Use the following to answer the questions below: Identify the standard amino acid with each of the characteristics using the response list. Responses may be used more than once or need not be used at all. -Only standard amino acid with a cyclic side chain