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. Cluster
- B. Spherical or curried up ball
- C. Long strands or fibrils
- D. Flat uncoiled chains
Explanation: The options describe different conformations of polypeptide chains.Option A describes a formation, not characteristic of fibrous…
Correct answer: Long strands or fibrils1702. In glycine, R is _.
- A. Ethane
- B. Fatty acid
- C. H atom
- D. Competitive reversible
Explanation: Glycine is the simplest amino acid, with its R group (the side chain of an amino acid) consisting of just a single hydrogen atom.
Correct answer: H atom- A. Primary structure of protein
- B. Secondary structure of protein
- C. Tertiary structure of protein
- D. Quaternary structure of protein
Explanation: Tertiary structure of protein represents the unique three-dimensional shape of the fully folded polypeptide.
Correct answer: Tertiary structure of protein- A. Physiological components
- B. Functional components
- C. Structural components
- D. Biological components
Explanation: Proteins play a crucial role as the main structural components of the cell.
Correct answer: Structural components- A. Condensation
- B. Hydrolysis
- C. Glycolysis
- D. Fixation
Explanation: Hydrolysis is a chemical reaction where water is used to break down a compound, resulting in the separation of the compound into its…
Correct answer: Hydrolysis- A. Anticodon site
- B. Ribosomes recognition site
- C. 3'-site with terminal OH
- D. Activation enzyme recognition site
Explanation: [A] At anticodon site is complementary to a corresponding codon in mRNA and binds to that specific complementary codons[B] Ribosome…
Correct answer: 3'-site with terminal OH- A. Parallel
- B. Both A, C
- C. Antiparallel
- D. None of these
Explanation: Coiling of two strands is opposite i.e they are coiled antiparallel to each other.
Correct answer: Antiparallel- A. CGAUACC
- B. CGTATGC
- C. CGATACC
- D. CGUTCC
Explanation: ExplanationThe mRNA would be complementary to the given DNA strand. RNA has Uracil Base instead of thymine.
Correct answer: CGAUACC- A. Dehydration
- B. Oxidation
- C. Rehydration
- D. Reduction
Explanation: Explanation:This is a dehydration reaction involving the formation of phosphodiester bonds.This option is incorrect.
Correct answer: Dehydration- A. Restriction endonuclease
- B. DNA helicase
- C. Primase
- D. DNA ligase
Explanation: Explanation:DNA Ligase is an enzyme that catalyzes the formation of a phosphodiester bond between adjacent Okazaki fragments on the…
Correct answer: DNA ligase- A. Uracil
- B. Thymine
- C. Cytosine
- D. Adenine
Explanation: [A] Uracil is a pyramiding present in RNA but not in DNA[B] Thymine(pyrimidine) is present in DNA[C] Cytosine(pyrimidine) is also present…
Correct answer: Uracil- A. Insertion
- B. Transposition
- C. Deletion
- D. Base Substitution
Explanation: In Sickle cell anemia, the gene for beta-globin is mutated. As a result, the amino acid valine is replaced by glutamic acid and the RBC…
Correct answer: Base Substitution- A. Uracil
- B. Thymine
- C. Guanine
- D. Cytosine
Explanation: The given structure is of a pyrimidine base which bears resemblance to the structure of Cytosine.
Correct answer: Cytosine- A. Making proteins.
- B. Making amino acids.
- C. Breakdown of ribose sugar
- D. Carries genetic material.
Explanation: DNA is a hereditary material which carries the genetic information generation after generation.
Correct answer: Carries genetic material.- A. 2
- B. 4
- C. 10
- D. 18
Explanation: 4 percent is correct option according to books4% is a reasonable and commonly accepted value that accounts for the total carbohydrate…
Correct answer: 4- A. Glycogen
- B. Collagen
- C. Starch
- D. Cellulose
Explanation: The correct answer is Option B: Collagen. Collagen is a protein, not a carbohydrate, and is essential for the structure and strength of…
Correct answer: Collagen- A. polysaccharides
- B. disaccharides
- C. monosaccharides
- D. oligosaccharides
Explanation: Disaccharides are carbohydrates composed of two sugar units joined by a glycosidic bond.
Correct answer: disaccharides- A. Plants
- B. Animals
- C. Cyanobacteria
- D. Both B and C
Explanation: Glycogen is a complex carbohydrate that serves as a storage form of glucose in animals.
Correct answer: Animals- A. Cellulose
- B. Glycogen
- C. Starch
- D. Lactose
Explanation: Lactose is a disaccharide, not a polysaccharide. It consists of glucose and galactose and is commonly found in milk and dairy products.
Correct answer: Lactose- A. ATP
- B. Calories
- C. ADP
- D. Carbohydrates
Explanation: Amount of energy in food is measured in calories.
Correct answer: Calories