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 28 of 90
- A. Fructose
- B. Glucose
- C. Ribulose
- D. Ribose
Explanation: Having aldehyde group and six carbon atoms glucose is an aldohexose.
Correct answer: Glucose- A. Straight chain
- B. Branched chain
- C. Ring structure
- D. Folded structure
Explanation: In solution form non cyclic monosaccharides acquire cyclic form and two types of ring structures are formed i.e.
Correct answer: Ring structure- A. Glucopyranose
- B. Fructofuranose
- C. Ribofuranose
- D. Deoxyribofuranose
Explanation: Six cornered ring of glucose is also called glucopyranose.
Correct answer: Glucopyranose- A. Three
- B. Two
- C. Four
- D. Five
Explanation: Out of five corners one is occupied by oxygen and rest of the four corners are occupied by carbon atoms whereas, and fifth carbon remains…
Correct answer: Four- A. Grapes
- B. Figs
- C. Dates
- D. All fruits
Explanation: It is found in all fruits however it is abundant in grapes, dates and figs.
Correct answer: All fruits- A. Many disaccharides & polysaccharides
- B. All oligosaccharides & polysaccharides
- C. All disaccharides & polysaccharides
- D. All trisaccharides & polysaccharides
Explanation: Glucose is part of sucrose, maltose and fructose which are disaccharides.
Correct answer: Many disaccharides & polysaccharides- A. Fructose
- B. Mannose
- C. Glucose
- D. Galactose
Explanation: Starch glycogen and cellulose are polymers of glucose monomers and they are synthesized by condensation of glucose monomers.
Correct answer: Glucose- A. 7170.6 Kcal
- B. 7170.6 cal
- C. 717.6 Kcal
- D. 720.6 Kcal
Explanation: As per PTB, energy stored in 10g of glucose is 717.6 kcal.
Correct answer: 717.6 Kcal- A. Monosaccharides
- B. Oligosaccharides
- C. Disaccharides
- D. Polysaccharides
Explanation: These are intermediate or moderate carbohydrates having properties in between monosaccharides and polysaccharides.
Correct answer: Oligosaccharides- A. 4, 4
- B. 1, 2
- C. 1, 4
- D. 2, 1
Explanation: It is condensation product of D-glycopyranose and L-fructofuranose. Thus carbon no.1 of glucose and carbon no.2 of fructose are involved.
Correct answer: 1, 2- A. Monosaccharides
- B. Oligosaccharides
- C. Disaccharides
- D. Polysaccharides
Explanation: Polysaccharides: Polysaccharides are the most complex and abundant carbohydrates in nature.
Correct answer: Polysaccharides- A. Monosaccharides
- B. Disaccharides
- C. Oligosaccharides
- D. Polysaccharides
Explanation: Correct answer: D) Polysaccharides are the carbohydrates that are only sparingly soluble in water.
Correct answer: Polysaccharides- A. Amylopectin
- B. Glycogen
- C. Cellulose
- D. Amylose
Explanation: Correct option: D) Amylose consists of an unbranched chain of α-glucose monomers.
Correct answer: Amylose- A. Unbranched, soluble
- B. Unbranched, insoluble
- C. Branched, soluble
- D. Branched, insoluble
Explanation: Correct option: D) Amylopectin starches have branched chains and are insoluble in hot or cold water.
Correct answer: Branched, insoluble- A. Glycogen
- B. Cellulose
- C. Dextrin
- D. Starches
Explanation: The iodine test is used to test the presence of starch. Starch turns its color to dark blue-black upon addition of aqueous solutions of…
Correct answer: Starches- A. Starch
- B. Chitin
- C. Glycogen
- D. Amylose
Explanation: In animals, surplus glucose is converted into insoluble glycogen and then it is stored in muscle and liver cells.
Correct answer: Glycogen- A. Glycogen
- B. Amylose
- C. Cellulose
- D. Agar
Explanation: Correct option: C) Cellulose is highly insoluble in water.
Correct answer: Cellulose- A. Starch
- B. Glycogen
- C. Cellulose
- D. Starch, Glycogen and Cellulose
Explanation: All of them are polymers of glucose monomers and are synthesized by condensation of glucose monomers, thus yield glucose monomer upon…
Correct answer: Starch, Glycogen and Cellulose- A. Amylase
- B. Cellulase
- C. Lipase
- D. Ptyalin
Explanation: Cellulase is any of several enzymes produced chiefly by fungi, bacteria and protozoans that catalyze the cellulolysis, the decomposition…
Correct answer: Cellulase- A. Amylose
- B. Amylopectin
- C. Glycogen
- D. Cellulose
Explanation: Correct option: D) Cellulose gives no color with iodine.
Correct answer: Cellulose