Which of the following will not exist in zwitter ionic form at $pH = 7$?

The correct structure of product $P$ in the following reaction is
$Asn-Ser + (excess) (CH_3CO)_2O \xrightarrow{NEt_3} P$

The $\alpha$-helix structure is found in which of the following?

Identify the acidic amino acid from the following (represented by using three-letter symbols).

The process by which the synthesis of protein takes place based on the genetic information present in $m-RNA$ is called:

An amino acid may be represented by the general formula $H_2N-CH(R)-COOH$. If $R = -CH_2C_6H_5$,it is phenylalanine $(Phe)$,and if $R = -CH_3$,it is alanine $(Ala)$. Identify the correct reagents from the list below to synthesize the dipeptide $Phe-Ala$:
$(1) ZNH-CH(CH_3)-COOH$
$(2) H_2N-CH(CH_3)-COOCH_2C_6H_5$
$(3) ZNH-CH(CH_2C_6H_5)-COOH$
$(4) H_2N-CH(CH_2C_6H_5)-COOCH_2C_6H_5$
(Note: $Z$ represents the benzyloxycarbonyl protecting group).