Biomolecules

Which one of the following sets of monosaccharides

forms sucrose?

• beta-D-Glucopyranose and

  alpha-D-fructofuranose

• alpha-D-Glucopyranose and

  beta-D-fructopyranose

• alpha-D-Galactopyranose and

  alpha-D-Glucopyranose

• alpha-D-Glucopyranose and

  beta-D-fructofuranose

"Ramachandran plot" is used to confirm the

structure of :-

• RNA

• Proteins

• Triacylglycerides

• DNA

Dipeptide is-

• Structure of two peptide bonds

• Two amino acids linked by one peptide bond

• bond between one amino acid and one peptide

• None

True statement for cellulose molecule -

• beta - 1'- 4" linkage. unbranched

• beta- 1'- 4" linkage. branched

• alpha - 1' - 4" linkage, branched

• beta - 1' - 6" linkage unbranched

Which one out of A - D given below correctly

represents the structural formula of the basic amino

acid ?

• A

• B

• C

• D

Assertion : The amino acid glycine comes under the category of nonessential amino acids.

Reason : This is due to the fact that it can not be synthesized in the body.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

Assertion: The long protein chain folds upon itself like a hollow ball giving rise to the tertiary structure.

Reason : Tertiary structure gives a 3-dimensional view of a protein.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false.

All the following statements about the structure of

glycogen are true, except :-

• Branched chains occur, after every ten residues

• It is a copolymer of glucose and mannose

• It contains a–1, 4–glycosidic linkages

• It contains a–1, 6–glycosidic linkages

On turn of the helix in a B-form DNA is approximately-

• 0.34 nm

• 3.4 nm

• 2 nm

• 20 nm

What is wrong about nucleic acids?

• DNA is single stranded in some viruses

• RNA is double stranded occassionally

• Length of helix is 45A∘ in B DNA

• One turn of Z - DNA has 12 bases