Biomolecules Additional Practice Test

12th Standard Chemistry — Biomolecules: Additional Online Practice Test

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Which carbon atom's configuration in D-glucose is compared with that of D-glyceraldehyde to assign the D notation?

A.C1 B.C2 C.C5 D.C6

When alpha-D-glucose and beta-D-glucose undergo mutarotation in water, they establish an equilibrium mixture with a constant specific rotation of:

A.+112 degrees B.+19 degrees C.+53 degrees D.+100 degrees

At the branching points of amylopectin in starch, new chains are linked by which type of glycosidic bond?

A.alpha(1,4) glycosidic bond B.beta(1,4) glycosidic bond C.alpha(1,6) glycosidic bond D.beta(1,6) glycosidic bond

Why are humans unable to use cellulose as a food source?

A.Cellulose contains alpha(1,4) glycosidic bonds which cannot be cleaved by human amylase. B.Humans lack the digestive enzymes like glycosidases or cellulases to hydrolyse beta(1,4) glycosidic bonds. C.Cellulose is highly branched and cannot be packed into human tissue layers. D.Cellulose undergoes spontaneous mutarotation in the body to form toxic ketoses.

Which of the following is a non-essential amino acid synthesised by the human body?

A.Valine B.Phenylalanine C.Alanine D.Leucine

At a pH value below its isoelectric point, an amino acid exists predominantly as:

A.A negatively charged anion B.A positively charged cation C.A neutral Zwitterion D.A non-polar molecule

In an alpha-helix sub-structure of proteins, the right-handed helical conformation is stabilised by hydrogen bonding between the carbonyl oxygen of the nth residue and the amino hydrogen of which residue?

A.n+2th residue B.n+3th residue C.n+4th residue D.n+5th residue

Which amino acid has a rigid cyclic structure that produces a kink in the polypeptide chain and is known as a "helix breaker"?

A.Glycine B.Proline C.Histidine D.Serine

During the denaturation of a protein, which level of protein structure remains completely intact?

A.Quaternary structure B.Tertiary structure C.Secondary structure D.Primary structure

Q10

Simple lipids classified as waxes are chemically defined as esters of long-chain fatty acids with:

A.Glycerol B.Long-chain monohydric alcohols C.Amino alcohols D.Phosphoric acid

Q11

Which class of vitamins cannot be stored in the body and must be regularly supplied through diet because any excess is excreted in urine?

A.Vitamins A and D B.Vitamins E and K C.Vitamins B and C D.Vitamins A and K

Q12

According to the text, which vitamin acts as a coenzyme in amino acid metabolism and is essential for the formation of heme in hemoglobin?

A.Vitamin B2 (Riboflavin) B.Vitamin B5 (Pantothenic acid) C.Vitamin B6 (Pyridoxine) D.Vitamin B7 (Biotin)

Q13

Which pyrimidine base is uniquely present in RNA molecules and replaces the thymine found in DNA?

A.Adenine B.Cytosine C.Uracil D.Guanine

Q14

The biological process by which a single-stranded messenger RNA (mRNA) molecule is synthesised from a DNA template strand is known as:

A.Translation B.Transcription C.Replication D.Denaturation

Q15

Chemically, hormones are organic substances secreted by endocrine glands and are classified into which two major groups?

A.Carbohydrates and lipids B.Proteins and steroids C.Amino acids and nucleotides D.Nucleic acids and vitamins

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About this Biomolecules test

This free online practice test covers Biomolecules from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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