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. Cross linked linear polymer
- B. Co polymer
- C. Homopolymer
- D. Condensation polymer
Explanation: The polymer formed by the polymerization of vinyl acetate (CH2=CHOOCCH3) is polyvinyl acetate (PVA), which is a homopolymer.
Correct answer: Homopolymer- A. Phenol
- B. Ethanol
- C. Butanol
- D. Methanol
Explanation: Bakelite is a condensation polymer of formaldehyde and phenol. In practice, the phenol and formaldehyde are first polymerized to a small…
Correct answer: Phenol- A. A polyamide
- B. A condensation polymer
- C. An addition polymer
- D. A polyester
Explanation: As you can see in the above image, polystyrene is an addition polymer, where the monomers (in this, a styrene molecule) are simply linked…
Correct answer: An addition polymer1124. Allotropes are of same?
- A. Compounds
- B. Molecules
- C. Ions
- D. Elements
Explanation: Option A: Compounds, refer to substances that are formed by the combination of two or more different elements or compounds.Option B…
Correct answer: Elements- A. One Unit Cell
- B. 8 Unit Cells
- C. 4 Unit Cells
- D. 2 Unit Cells
Explanation: In the z=0 configuration below, the center chloride ion actually belongs to two unit cells in the overall crystal.
Correct answer: 2 Unit Cells- A. B2H6
- B. B4C
- C. B
- D. BN
Explanation: H−BN or BN structure consists of an alternate arrangement of Boron and Nitrogen atoms in a 2-dimensional plane and turn, forms a hexagonal…
Correct answer: BN- A. Hydrogen
- B. Ethers
- C. Carboxylic acid
- D. Formaldehyde
Explanation: Option A: Hydrogen is not involved in the synthesis of Bakelite, so this answer is incorrect.
Correct answer: Formaldehyde- A. Carbon
- B. Hydrogen
- C. Nitrogen
- D. Sulphur
Explanation: Proteins are made from amino acids, and out of the 20 available amino acids, only two contain sulfur.
Correct answer: Sulphur- A. Mn2+
- B. Mg2+
- C. Zn2+
- D. None of these options are correct
Explanation: It is a fact that phosphatase enzymes are activated by Mg+2 ions. Hence, option B is correct.
Correct answer: Mg2+- A. Polyvinyl
- B. Polethyl
- C. Polyethylene
- D. Polyethoxy
Explanation: Ethene is polymerized to form polyethene, which is also called polyethylene.
Correct answer: Polyethylene- A. 1020
- B. 2010
- C. 1040
- D. 1510
Explanation: A reaction might be sped up by an enzyme upto 1020 times the original rate.
Correct answer: 1020- A. -[CCl2-CCl2]-
- B. -[HCCl-CH-Cl]-
- C. [H2C=CH-Cl]
- D. -[H2C-CH-Cl]-
Explanation: Poly(vinyl chloride) (PVC) is a synthetic resin made from vinyl chloride and is a member of a large family of polymers broadly referred to…
Correct answer: -[H2C-CH-Cl]-- A. Poly styrene
- B. Polyester
- C. Polyamide
- D. Polyvinyl alcohol
Explanation: Nylon-6,6 is a synthetic polymer called a polyamide because of the characteristic monomers of amides in the backbone chainPolystyrene is a…
Correct answer: Polyamide- A. (-CF2-CF2-)n
- B. (-CF2-CCl2-)n
- C. (-CH2-CH2-)n
- D. (-CF2-CH2-)n
Explanation: Teflon is a synthetic polymer containing carbon and fluorine called polytetrafluoroethylene. Its formula is (C2F4)n.
Correct answer: (-CF2-CF2-)n- A. Alpha helix
- B. Beta helix
- C. Spiral
- D. Concentrate
Explanation: Left handed helix in protein secondary structure is known as alpha helix.
Correct answer: Beta helix- A. Dehydration reaction
- B. Formation of disulphide bridges
- C. Ionic bonding of monomers
- D. Hydrolysis
Explanation: Monomers polymerize to form long chains called polymers. They undergo condensation reactions in which there may be loss of a water…
Correct answer: Dehydration reaction- A. Polyacrylonitrile
- B. Rayon fibre
- C. PVC
- D. Teflon
Explanation: Acrylonitrile monomers join to form polyacrylonitrile (PAN), which is also called polyvinyl cyanide or Creslan 61.
Correct answer: Polyacrylonitrile1138. Polymers are made up of:
- A. Monomers
- B. Epimers
- C. Enantiomers
- D. Isomers
Explanation: Polymers are large molecules made up of small, repeated units called monomers.
Correct answer: Monomers- A. 5
- B. 4
- C. 2
- D. 3
Explanation: There are three types of polymers based on their sources:1) Natural e.g. proteins, cellulose, starch.2) Synthetic e.g.
Correct answer: 3- A. 4
- B. 2
- C. 6
- D. 3
Explanation: There are two types of polymerization reactions: 1) Condensation; formation of larger molecules from smaller ones by releasing a small…
Correct answer: 2