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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- A. Triacylglycerol
- B. Diacylglycerol
- C. Monoacyl glycerol
- D. Monoglyceride
Explanation: The most widely spread glycerol is triacylglycerol also called triglycerides.
Correct answer: Triacylglycerol- A. Glycerol
- B. Alcohol
- C. Phosphoric acid
- D. Fatty acids
Explanation: The hydrophobic tails of phospholipids are indeed fatty acids that are non-polar.
Correct answer: Fatty acids- A. Remain stable
- B. Lie flat
- C. Acquire coiling
- D. Acquire folding
Explanation: Most of the primary proteins are folded, refolded and aggregated to acquire secondary, tertiary and quaternary structural levels…
Correct answer: Lie flat- A. Primary protein
- B. Secondary protein
- C. Tertiary protein
- D. Quaternary protein
Explanation: It involves primary ,secondary and tertiary levels as well.The quaternary structure of a protein is the most complex level of protein…
Correct answer: Quaternary protein1505. DNA was discovered by:
- A. A French chemist
- B. A German chemist
- C. ASwiss chemist
- D. A Spanish chemist
Explanation: The molecule now known as DNA was first identified in the 1860s by a Swiss chemist called Johann Friedrich Miescher.
Correct answer: ASwiss chemist- A. One sub unit
- B. Two sub units
- C. Three sub units
- D. Four sub units
Explanation: Nucleotide consists of pentose sugar, nitrogenous base and phosphoric acid.
Correct answer: Three sub units- A. Maurice Wilkins
- B. Erwin Chargaff
- C. Watson and Crick
- D. Rosalind and Franklin
Explanation: Erwin Chargaff was an Austrian-American biochemist. He is best known for his research on the composition of DNA and the discovery of…
Correct answer: Erwin Chargaff1508. Glycogen is stored in:
- A. Liver
- B. Spleen
- C. W.B.C.
- D. Skin cells
Explanation: The liver is located in the upper right portion of the abdomen, beneath the diaphragm. It is the largest internal organ in the body.
Correct answer: Liver- A. One
- B. Two
- C. Three
- D. No one
Explanation: Dipeptides have only one peptide linkage between them formed by the removal of water
Correct answer: One- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Amino acids have an amino group (-NH2) and a carboxyl group (-COOH) attached to the same carbon atom, also known as alpha carbon.
Correct answer: Option A- A. Maltose
- B. Glycine
- C. Cellulose
- D. Cellbiose
Explanation: Glycine is an amino acid, which is one of the building blocks of proteins.
Correct answer: Glycine- A. α -1-4 linkages
- B. Both α -1-4 and α 1-6 linkages
- C. α -16 linkages
- D. All of the above
Explanation: In amylose, glucose units are linked by α -1-4 linkages.
Correct answer: α -1-4 linkages- A. Glycogen is analogous to starch
- B. It is a structural polysaccharide
- C. It is non reducing sugar
- D. It gives red colour with iodine solution
Explanation: Glycogen is a structural polysaccharide.
Correct answer: It is a structural polysaccharide- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Cellulose resembles with amylase starch in such a way that it has un-branched structure, but it has B-1, 4-glycosidic linkages between…
Correct answer: Option C- A. Cellulose
- B. Glycogen
- C. Waxes
- D. Amino acids
Explanation: Cotton is primarily composed of cellulose, a complex carbohydrate or polysaccharide that forms the structural component of plant cell…
Correct answer: Cellulose- A. Carbon, water, and oxygen
- B. Carbon, sulfur, and hydrogen
- C. Carbon, calcium, and hydrogen
- D. Carbon, hydrogen, and oxygen
Explanation: Carbohydrates are organic molecules composed of three elements: carbon (C), hydrogen (H), and oxygen (O).
Correct answer: Carbon, hydrogen, and oxygen- A. F. Sanger
- B. George Beadle
- C. Edward Tatum
- D. Vernon Ingram
Explanation: The correct answer is Ingram. Vernon Ingram's pioneering work in the 1950s showed that sickle cell anaemia is caused by a single amino…
Correct answer: Vernon Ingram- A. Egg
- B. Fishes
- C. Pulses
- D. Milk
Explanation: The correct answer is C, as pulses are vegetative sources of protein. Pulses, such as beans, lentils, and chickpeas, are especially rich…
Correct answer: Pulses- A. Histidine
- B. Lactic acid
- C. Alanine
- D. Glycine
Explanation: The correct answer is lactic acid. Lactic acid is not an amino acid; it is an organic compound that plays a role in various metabolic…
Correct answer: Lactic acid1520. Sterols are:
- A. Lipid
- B. Protein
- C. Carbohydrate
- D. Both A and B
Explanation: Sterols, such as cholesterol, are a subgroup of lipids, characterized by their multiple-ring structure.
Correct answer: Lipid