Biomolecules Chemistry - Biomolecules

Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?

Which among the following carbohydrate molecules yields highest number of ees:13 galactose molecules when one mole of each is hydrolyzed?

What is the number of primary and secondary alcoholic groups respectively present in glucose?

Which among the following carbohydrate molecules is not further hydrolysed in to smaller units?

Draw structural formulae of nucleosides formed from the following sugars and bases.
D – 2 – deoxyribose and thymine

α – Amino acids have high melting points compared to the corresponding amines or carboxylic acids of comparable molecular mass. Give scientific reasons.

The disaccharide sucrose gives negative Tollens test while the disaccharide maltose gives positive Tollens test. Give scientific reasons.

Draw structural formulae of nucleosides formed from the following sugars and bases.
D – ribose and guanine

Tryptophan and histidine have the structures (I) and (II) respectively. Classify them into neutral? acidic/basic &amino acids and justify your answer. (Hint: Consider învolvement of lone pair in resonance).

Compare the molecular masses of the following compounds and explain the observed melting points.

Assign D/L configuration to the following monosaccharides.

Write the sequence of the complementary strand of the following portion of a DNA molecule : 5 -ACGTAC-3

Draw a schematic representaion of trinucicotide segment ACT of a DNA molecule.

Write down the structures of amino acids constituting the following peptide.

A protein chain has the following amino acid residues. Show and label the interactions that can be present in various pairs from these giving rise to tertiary level structure of protein.

(1) Is galactose an aldohexose or a ketohexose?
(2) Which carbon in galactose has different configuration compared to glucose?
(3) Draw Haworth formulae of α-D-galactose and β-D-galactose.
(4) Which disaccharides among sucrose, maltose and lactose is/are expected to give positive Fehling test?
(5) What are the expected products of hydrolysis of lactose?

Observe the following structural formulae carefully and answer the questions.

(1) How many OH groups are present in glucose, fructose and ribose respectively?
(2) Which other functional groups are present in these three compounds?

Explain double helix.###State the salient features of the Watson and Crick mode of DNA.

What is meant by nucleosides?###Write the structure of nucleoside. Give examples.

Is this dipeptide same as glycyalanine or its structural isomer?

Name the resulting dipeptide.

Write the structural formula of dipeptide formed by combination of carboxyl group of alanine and amino group of glycine.

Which acid molecules are present in nuclei of living cells?Write in single term.

Why does wheat grain germinate to produce wheat plant and not rice plant?Write in single term.