Assertion and reason

Exercise and reference answers

Questions

1. Reason

   The amino, carboxyl and α-carbon are common, so only the R group varies.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Amino acids differ from one another chiefly in one place.

2. Reason

   Both the amino and the acidic group sit on the same α-carbon.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   They are called α-amino acids specifically.

3. Reason

   Amino acids carry an amino and an acidic group.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   All amino acids occur in proteins.

Explanation