Free Biological Molecules MCQs with Answers
1,790 Biological Molecules MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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1,790 questions · page 32 of 90
- A. 4
- B. 5
- C. 6
- D. 7
Explanation: The number of -OH groups in glucose is 5.
Correct answer: 5- A. DNA, ATP, Ribulose bisphosphate and Cysteine
- B. DNA, NAD and Insulin
- C. DNA, NADP, ATP and Ribulose bisphosphate
- D. DNA. RNA and Myosin
Explanation: DNA is a double-stranded molecule that encodes genetic information in cells.DNA provides the instructions for building and maintaining…
Correct answer: DNA, NADP, ATP and Ribulose bisphosphate- A. Pyran, Pyran
- B. Furan, Furan
- C. Furan, pyran
- D. Pyran, Furan
Explanation: "Furan" is a term used in organic chemistry to refer to a heterocyclic compound that consists of a five-membered ring containing four…
Correct answer: Pyran, Furan- A. 374
- B. 474
- C. 574
- D. 674
Explanation: The specific heat of vaporization of water is 574 Kcal/kg.
Correct answer: 574- A. Globular proteins
- B. Intermediate protein
- C. Fibrous Proteins
- D. Integral protein
Explanation: Actin and myosin both have filament shape structure
Correct answer: Fibrous Proteins- A. Lipids
- B. Proteins
- C. Nucleic acids
- D. Carbohydrates
Explanation: Nucleic acids are not used to synthesize ATP or store energy in any form.
Correct answer: Nucleic acids- A. I.Phosphate; II. Ribose; Ill. Nitrogenous base
- B. I. Phosphate; II. Nitrogen base; III. Ribose
- C. I. Nitrogenbase: II. Phosphate: III. Ribose
- D. I. Ribose: II. Nitrogen base; III. Phosphate
Explanation: Option D is correct, as Ribose: II. nitrogen base; III. Phosphate
Correct answer: I.Phosphate; II. Ribose; Ill. Nitrogenous base- A. Duplex
- B. Double stranded structure
- C. Single stranded structure
- D. Genetic material
Explanation: A single-stranded structure refers to a molecule that consists of only one chain of nucleotides or monomers, as opposed to the…
Correct answer: Single stranded structure- A. mRNA
- B. tRNA
- C. rRNA
- D. snRNA
Explanation: Transfer RNA (tRNA) is a type of RNA (ribonucleic acid) molecule that plays a vital role in the process of protein synthesis within cells.
Correct answer: tRNA- A. DNA
- B. Chromosome
- C. Ribosome
- D. Nucleosome
Explanation: A ribosome is a cellular structure that functions as the site of protein synthesis in both prokaryotic and eukaryotic cells.
Correct answer: Ribosome- A. C11H22O11
- B. C12H22O11
- C. C12H24O12
- D. C11H24O12
Explanation: Option B is correct, as it is the correct molecular formula of lactose.
Correct answer: C12H22O11- A. Fructose
- B. Sucrose
- C. Maltose
- D. Galactose
Explanation: Sucrose is a common disaccharide, meaning it is composed of two monosaccharide sugar units.
Correct answer: Sucrose- A. Enzymatic
- B. Fibrous
- C. Soluble
- D. Globular
Explanation: Fibrous proteins are a class of proteins characterized by their elongated, thread-like structures.
Correct answer: Fibrous- A. Carbohydrates and are functionally similar
- B. Carbohydrates but functionally different
- C. Proteins and functionally similar
- D. Different but functionally similar
Explanation: Keratin and chitin are chemically different but functionally similar.
Correct answer: Different but functionally similar- A. Dehydration synthesis
- B. Hydration synthesis
- C. Dehydrogenation
- D. Hydrogenation
Explanation: Dehydration synthesis, also known as condensation reaction, is a chemical process through which two molecules are covalently linked…
Correct answer: Dehydration synthesis636. Glycosidic bond is:
- A. C-O-C
- B. >C=O
- C. CONH
- D. CHO
Explanation: Carbon-oxygen association in glycosidic linkages provides stability to the complex carbohydrate molecules.
Correct answer: C-O-C- A. Egg
- B. Soyabean
- C. Pulses
- D. Both B and C
Explanation: The correct answer is both B and C. Soyabean and pulses are both vegetative sources of protein.
Correct answer: Both B and C- A. Insoluble
- B. Non folded
- C. Nonfunctional
- D. All of above
Explanation: Coagulated protein is insoluble, non-folded, and non-functional.
Correct answer: All of above639. Sterols are:
- A. Lipid
- B. Protein
- C. Carbohydrates
- D. All of these
Explanation: Sterols are a class of lipid and the most common one is cholesterol.
Correct answer: Lipid- A. Insoluble in water and soluble in fat solvent.
- B. High energy content
- C. Structural component of cell membrane
- D. All of these
Explanation: Fats are insoluble in water because water is polar and fats are non polar, hence making them fat soluble only.
Correct answer: All of these