How many amino acids are linked together by $(n-1)$ amide bonds?

Consider the following statements:
Statement-$I$: Lysine and arginine are essential and basic amino acids.
Statement-$II$: Leucine and phenylalanine are non-essential and neutral amino acids.

Haemoglobin is

Choose the correct Zwitter ionic form for aspartic acid.

Which of the following is a Zwitter ion?

Consider the following statements:
Statement-$I$: The primary structure of a protein represents its amino acid sequence.
Statement-$II$: The $\alpha$-helix and $\beta$-pleated sheet structures of a protein represent its tertiary structure.