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 31 of 90
- A. 1.3 picograms
- B. 2.3 picograms
- C. 1.6 picograms
- D. 2.4 picograms
Explanation: As kidney cells are diploid (2n) as compared to haploid (n) sperm cells.
Correct answer: 1.6 picograms- A. 5 million bases
- B. 5 billion bases
- C. 0.5 million bases
- D. 50 million bases
Explanation: These are 5 million bases arranged in a particular linear order.
Correct answer: 5 million bases- A. RNA, DNA
- B. RNA, RNA
- C. DNA, DNA
- D. DNA, RNA
Explanation: RNA is synthesized through the process of transcription by using DNA as a template.
Correct answer: RNA, DNA604. RNAs are synthesized in the _ and then are moved out in the _ to perform their specific functions.
- A. Cytoplasm, Nucleus
- B. Nucleus, Cytoplasm
- C. Nucleus, Nucleus
- D. Cytoplasm, Cytoplasm
Explanation: Transcription occurs in nucleus by using chromosomal DNA as template, then mRNA transcript is moved on through nuclear pores to the…
Correct answer: Nucleus, Cytoplasm- A. Ribosomal RNA
- B. Messenger RNA
- C. Transfer RNA
- D. DNA
Explanation: It takes the message encoded on genes to the ribosomes in cytoplasm where it is translated into proteins.
Correct answer: Messenger RNA- A. tRNA
- B. mRNA
- C. rRNA
- D. ScRNA
Explanation: It transfers appropriate amino acids to growing polypeptide chain.
Correct answer: tRNA- A. tRNA
- B. mRNA
- C. rRNA
- D. SnRNA
Explanation: Quantitatively rRNA is the major form of RNA in cell.
Correct answer: rRNA- A. Golgi Apparatus
- B. Ribosomal RNA
- C. Mitochondria
- D. DNA of a gene
Explanation: It is used to make peptide bonds between amino acids and as a result polypeptide chain is synthesized.
Correct answer: Ribosomal RNA- A. Human pus cells
- B. Fish sperm cells
- C. Human pus cells and fish sperm cells
- D. Human sperm cells and fish pus cells
Explanation: Frederick Miesher isolated a whitish substance from the nuclei of human pus cells and fish sperm cells and called it nuclien.
Correct answer: Human pus cells and fish sperm cells- A. Two
- B. Three
- C. Four
- D. Six
Explanation: Unsaturated fatty acids have double bonds.
Correct answer: Six- A. 0.8
- B. 1.8
- C. 0.6
- D. 0.08
Explanation: Specific gravity of fats and oils is 0.8.
Correct answer: 0.8- A. Polar molecule
- B. Universal solvent
- C. High specific heat and high heat of vaporization
- D. Water expands at high temperature
Explanation: Water has a unique property, as it expands when temperature falls below 4°C (39°F).
Correct answer: Water expands at high temperature613. The heat required to convert one gram of liquid water into vapors at its boiling point is called:
- A. Heat of condensation
- B. Heat of neutralization
- C. Specific heat
- D. Heat of vaporization
Explanation: The heat required to convert one gram of liquid water into vapors at its boiling point is called heat of vapourization.The heat of…
Correct answer: Heat of vaporization- A. Water has high specific heat
- B. Water has high heat of vaporization
- C. Water is not universal solvent
- D. Water exhibits strong cohesion tension
Explanation: Therefore, the option that is not correct about water is C ,water is not a universal solvent Water is actually a universal solvent because…
Correct answer: Water is not universal solvent615. Ice floats because:
- A. It is less dense than water
- B. It is more dense than water
- C. It occupies less space than water
- D. It occupies more space than water
Explanation: Therefore, the correct statement for why ice floats is A becuase water has a unique property, as it expands when temperature falls below…
Correct answer: It is less dense than water- A. Adhesion
- B. Cohesion
- C. Ionic bonding
- D. Surface tension
Explanation: Adhesion refers to the tendency of water molecules to be attracted, or "stick", to other substances.
Correct answer: Adhesion617. The formation of a large molecule from two small molecules with the removal of water is called:
- A. Condensation
- B. Hydrolysis
- C. Dehydration synthesis
- D. Both A and c
Explanation: Because dehydration synthesis is the combination of smaller molecules into the larger molecule with the removal of water.This process…
Correct answer: Both A and c- A. 4
- B. 3
- C. 2
- D. 1
Explanation: 3 percent amount of carbohydrates is present in a bacterial cell.
Correct answer: 3- A. 1,6
- B. 1,4
- C. 2,6
- D. 1,2
Explanation: "The explanation for this question will be added soon!".
Correct answer: 1,2- A. Carbonic anhydrase
- B. Glycogen
- C. Haemoglobin
- D. Insulin
Explanation: Glycogen is a complex carbohydrate and a form of energy storage in animals, including humans.
Correct answer: Glycogen