Proteins

Immunoglobins or antibodies are _____ (proteins/fats) produced by lymphocytes. 

Which of the following is the biological importance of protein?

Some hormones are proteinaceous, e.g., insulin, growth, hormone of pituitary etc.

Pollen grains possess specific proteins in their walls for compatibility incompatibility reaction with the stigma during pollination.

What are the biological importance of proteins?

Which of the following is not the characteristic of an enzyme?

What is the tertiary structure of the protein?

Identify the naturally occurring amino acids from the following.

Valine is a naturally occurring amino acid.

Which of the following is not a naturally occurring amino acid?

Give examples of some naturally occurring amino acids?

Which protein structure is the most complex?  (primary / tertiary / quaternary) 

The spatial arrangement of subunits with respect to each other is known as _____ structure of proteins.

The isoelectric point is a

Which of the list shown below have the correct pair of the structure of alanine in $\mathrm{pH}$ ranges $2-4$ and $9-11$ is

I. ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2\mathrm{H}$

II. ${\mathrm{H}}_2\mathrm{N}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2^{-}$

III. ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2^{-}$

IV. ${\mathrm{H}}_2\mathrm{N}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2\mathrm{H}$

Which of the list shown below have the correct pair of the structure of alanine in $\mathrm{pH}$ ranges $2-4$ and $9-11$ is

I. ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2\mathrm{H}$

II. ${\mathrm{H}}_2\mathrm{N}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2^{-}$

III. ${\mathrm{H}}_3\stackrel{+}{\mathrm{N}}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2^{-}$

IV. ${\mathrm{H}}_2\mathrm{N}-\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CO}}_2\mathrm{H}$

Which of the following amino acids is/are optically active?
(i) Glycine
(ii) Alanine
(iii) Leucine
(iv) Isoleucine

Draw the structures of five neutral amino acids.

Arginine and glycine both are neutral amino acids.

The above compound is an example of