Zoology MCQs for NEET — Practice Questions with Answers

(d) All living cells contains nucleoproteins, i.e. substances made up of proteins combined with biopolymers (known as nucleic acids). Nucleic acids are biologically important polymers which are present in all living cells. DNA is the polymer of nucleotides.

(a) Glucagon is a peptide hormone because in it peptide linkage is present.

Fact

Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. All monosaccharides such as glucose are reducing sugars. A disaccharide can be a reducing sugar or a non-reducing sugar. Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar.

The two forms of glucopyranose obtained from a solution of D-glucose are called anomers. Anomers are stereoisomers that differ in the configuration at the anomeric carbon atom, which is the carbon atom attached to two oxygen atoms.

Fact

C₂ epimer

 $\mathrm{Sucrose} + \mathrm{HOH} \stackrel{ {\mathrm{H}}^{+} }{\to } \mathrm{Glucose} + \mathrm{Fructose}$

Lysine is a basic amino acid due to the presence of an additional amino group (-NH2) in its side chain. Basic amino acids have a net positive charge at physiological pH and can accept protons due to their basic side chains.

Glucose is solid and water is liquid hence both can be separated by distillation.

 Nonreducing sugar A sugar that cannot donate electrons to other molecules and therefore cannot act as a reducing agent. Sucrose is the most common nonreducing sugar

(c) NH₂CH₂COOH (glycine) NH₂-CH-COOH (Alanine)
                                               l
                                              CH₃