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 79 of 90
- A. 2
- B. 5
- C. 10
- D. All of these
Explanation: 'Oligosaccharides' are carbohydrates that contain carbon atoms ranging from 'two to ten' monosaccharides and hence, upon hydrolysis can…
Correct answer: All of these- A. Silk
- B. Wool
- C. Cotton
- D. Paper
Explanation: Cotton is the purest form of cellulose. ''Silk, wool and paper all have other substances.''
Correct answer: Cotton1563. A complex substance that, on hydrolysis, yields polyhydroxy aldehyde or ketone subunits is called
- A. Lipid
- B. Carbohydrate
- C. Protein
- D. All of these
Explanation: Carbohydrates are made of hydrocarbons; hence, on hydrolysis, they may yield polyhydroxy aldehyde or ketone subunits.
Correct answer: Carbohydrate- A. Monosaccharides
- B. Disaccharides
- C. Oligosaccharides
- D. Polysaccharides
Explanation: Monosaccharides form rings consisting of five or six carbon atoms (hence they are pyranoses).
Correct answer: Monosaccharides- A. Amylase
- B. Sucrose
- C. Starch
- D. Lactose
Explanation: The carbohydrate that is polymerized through alpha 1,4 glycosidic linkages is starch.
Correct answer: Starch- A. Glucose
- B. Starch
- C. Sucrose
- D. Glycogen
Explanation: Glycogen is a polysaccharide that serves as a form of stored energy in animals and fungi. Glucose is the primary source of energy.
Correct answer: Glycogen- A. Triose
- B. Diose
- C. Monose
- D. None of these
Explanation: Option A is correct as monosaccharides are the simplest forms of carbohydrates.
Correct answer: Triose- A. Liver
- B. Muscles
- C. kidneys
- D. Both a and b
Explanation: Glycogen is stored both in liver and muscles. Muscles because it requires active supply of energy and liver because blood from digestive…
Correct answer: Both a and b- A. Fats
- B. Glycogen
- C. Amino acids
- D. DNA
Explanation: Glycogen is the stored form of glucose in animals. Glyocgen can be hydrolysed to produce glucose to get energy.
Correct answer: Glycogen- A. Monosaccharides
- B. Oligosaccharides
- C. Polysaccharides
- D. Carbohydrates
Explanation: Polysaccharides are major classes of biomolecules. They are long chains of carbohydrate molecules, composed of several smaller…
Correct answer: Polysaccharides1571. 'Biomolecules' such as starch, cellulose and glycogen yield which of the following upon hydrolysis?
- A. Maltose
- B. Sucrose
- C. Glucose
- D. Galactose
Explanation: Option C is correct since the three most abundant polysaccharides, starch, glycogen, and cellulose ( referred to as homopolymers) yield…
Correct answer: Glucose- A. 1000
- B. 2000
- C. 3 to 7000
- D. 3000 and more
Explanation: Option C is correct since the general formula of carbohydrates is Cx(h20)y where x is a whole number from 3 to many thousand whereas y may…
Correct answer: 3 to 7000- A. Maltose
- B. Sucrose
- C. Lactose
- D. All of these
Explanation: Maltose is the immediate product of digestion of starch. Sucrose is the tranport sugar in plants. Lactose is the sugar present in milk.
Correct answer: All of these1574. Unit of carbohydrate is?
- A. Monosaccharides
- B. Amino acids
- C. Fatty acids
- D. All
Explanation: Monosaccharide: The most basic, fundamental unit of a carbohydrate. These are simple sugars with the general chemical structure of C6H12O6.
Correct answer: Monosaccharides- A. Enzymes
- B. Coenzymes
- C. Vitamins
- D. Antibiotics
Explanation: Metabolically-important species that include phosphorylated ribose include ADP, ATP, coenzyme A, and NADH. Thus, option B is correct.
Correct answer: Coenzymes- A. Starch
- B. Cellulose
- C. Glycogen
- D. All of these
Explanation: Out of all the options, the most abundant carbohydrate in animals is glycogen.
Correct answer: Glycogen- A. Amino acids
- B. Nucleotides
- C. Citric acids
- D. Isoprenoid units
Explanation: b) Nucleotides:This is the correct answer. Nucleic acids, such as DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are made up of…
Correct answer: Nucleotides- A. Structure of cells
- B. Enzymatic function
- C. Metabolic function
- D. Both A and B
Explanation: Option D is correct since it includes both A and B which are right. The insoluble nature of large organic molecules means that it is…
Correct answer: Both A and B- A. Combining of molecules due to reaction with hydrogen
- B. Combining of molecules due to reaction with water
- C. Breaking of molecules due to reaction with water
- D. Breaking of molecules due to reaction with hydrogen
Explanation: The 'lysis' in hydrolysis means splitting. It is the splitting of molecule using water.
Correct answer: Breaking of molecules due to reaction with water- A. Carbon dioxide
- B. Water
- C. Lipid
- D. Hydrochloric acid
Explanation: Fats, nucleic acids, carbohydrates, enzymes, proteins, and hydrocarbon fuels are examples of organic molecules.
Correct answer: Lipid