Biomolecules Book Back Practice Test

12th Standard Chemistry — Biomolecules: Book Back Online Practice Test

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Which one of the following rotates the plane polarized light towards left?

A.D(+) Glucose B.L(+) Glucose C.D(-) Fructose D.D(+) Galactose

The correct corresponding order of names of four aldoses with configuration given below respectively is,

A.L-Erythrose, L-Threose, L-Erythrose, D-Threose B.D-Threose, D-Erythrose, L-Threose, L-Erythrose C.L-Erythrose, L-Threose, D-Erythrose, D-Threose D.D-Erythrose, D-Threose, L-Erythrose, L-Threose

Which one of the following is a non-reducing sugar?

A.Glucose B.Sucrose C.Maltose D.Lactose

Glucose reacts with hydrogen cyanide to form a product, which on hydrolysis followed by reduction with hydrogen iodide and heat gives compound A. Identify compound A:

A.Heptanoic acid B.2-Iodohexane C.Heptane D.Heptanol

Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory. Reason: Sucrose hydrolysis gives equal amounts of glucose and fructose. As a result, this change in sign of rotation is observed.

A.If both assertion and reason are true and reason is the correct explanation of assertion B.If both assertion and reason are true but reason is not the correct explanation of assertion C.If assertion is true but reason is false D.If both assertion and reason are false

The central dogma of molecular genetics states that the genetic information flows from:

A.Amino acids \(\rightarrow\) Protein \(\rightarrow\) DNA B.DNA \(\rightarrow\) Carbohydrates \(\rightarrow\) Proteins C.DNA \(\rightarrow\) RNA \(\rightarrow\) Proteins D.DNA \(\rightarrow\) RNA \(\rightarrow\) Carbohydrates

In a protein, various amino acids are linked together by:

A.Peptide bond B.Dative bond C.\(\alpha\)-Glycosidic bond D.\(\beta\)-Glycosidic bond

Among the following, the achiral amino acid is:

A.2-ethylalanine B.2-methylglycine C.2-hydroxymethylserine D.Tryptophan

The correct statement regarding RNA and DNA respectively is:

A.The sugar component in RNA is an arabinose and the sugar component in DNA is ribose B.The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose C.The sugar component in RNA is an arabinose and the sugar component in DNA is 2'-deoxyribose D.The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose

Q10

In aqueous solution, amino acids mostly exist in the form of:

A.NH2-CH(R)-COOH B.NH2-CH(R)-COO- C.H3N+-CH(R)-COOH D.H3N+-CH(R)-COO-

Q11

Which one of the following is not produced by the human body?

A.DNA B.Enzymes C.Hormones D.Vitamins

Q12

The number of sp2 and sp3 hybridised carbons in fructose are respectively:

A.1 and 4 B.4 and 2 C.5 and 1 D.1 and 5

Q13

Vitamin B2 is also known as:

A.Riboflavin B.Thiamine C.Nicotinamide D.Pyridoxine

Q14

The pyrimidine bases present in DNA are

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

Q15

Among the following L-serine is

A.(figure A)

B.(figure B)

C.(figure C)

D.(figure D)

Q16

The secondary structure of a protein refers to

A.fixed configuration of the polypeptide backbone B.hydrophobic interaction C.sequence of \(\\alpha\)-amino acids D.\(\\alpha\)-helical backbone

Q17

Which of the following vitamins is water soluble?

A.Vitamin E B.Vitamin K C.Vitamin A D.Vitamin B

Q18

Complete hydrolysis of cellulose gives

A.L-Glucose B.D-Fructose C.D-Ribose D.D-Glucose

Q19

Which of the following statement is not correct?

A.Ovalbumin is a simple food reserve in egg-white B.Blood proteins thrombin and fibrinogen are involved in blood clotting C.Denaturation makes protein more active D.Insulin maintains the sugar level of in the human body.

Q20

Glucose is an aldose. Which one of the following reactions is not expected with glucose?

A.It does not form oxime B.It does not react with Grignard reagent C.It does not form osazones D.It does not reduce tollens reagent

Q21

If one strand of the DNA has the sequence 'ATGCTTGA', then the sequence of complementary strand would be

A.TACGAACT B.TCCGAACT C.TACGTACT D.TACGRAGT

Q22

Insulin, a hormone chemically is

A.Fat B.Steroid C.Protein D.Carbohydrates

Q23

\(\\alpha\)-D (+) Glucose and \(\\beta\)-D (+) glucose are

A.Epimers B.Anomers C.Enantiomers D.Conformational isomers

Q24

Which of the following are epimers

A.D(+)-Glucose and D(+)-Galactose B.D(+)-Glucose and D(+)-Mannose C.Neither (a) nor (b) D.Both (a) and (b)

Q25

Which of the following amino acids are achiral?

A.Alanine B.Leucine C.Proline D.Glycine

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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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