All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 930 of 993
- A. Osteomalacia (soft bones)
- B. Disc slip
- C. Arthritis
- D. Spondylosis
Explanation: Options [A] osteomalacia is a group of diseases in which bone resorption outpaces bone deposit[ it means there is more bone depletion than…
Correct answer: Spondylosis- A. Sciatica
- B. Spondylosis
- C. Rheumatoid arthritis
- D. Rickets
Explanation: Rheumatoid arthritis (RA) is an autoimmune disorder that causes chronic inflammation of the joints.
Correct answer: Rheumatoid arthritis- A. Nerve cells.
- B. Brain cells.
- C. Bone cells.
- D. None of these.
Explanation: b) Brain cells: Brain cells, which include various types of neurons and glial cells, also contain a significant amount of water due to…
Correct answer: Brain cells.- A. 20
- B. 40
- C. 85
- D. 90
Explanation: Bone is a complex and rigid connective tissue that contains various components, including cells, fibres, and minerals.
Correct answer: 20- A. Water
- B. Protein
- C. Carbohydrates
- D. Lipids
Explanation: Water (Option A) forms almost three-fourths of the body by weight. The human body is composed of a significant amount of water, which…
Correct answer: Water- A. Hydrophilic exclusion
- B. Hydrophobic
- C. Specific heat capacity exclusion
- D. Heat of vaporization
Explanation: Biologically, the hydrophobic interactions (Option B) play key roles in maintaining the integrity of lipid bilayer membranes.
Correct answer: Hydrophobic- A. Reduction
- B. Oxidation
- C. Redox
- D. None of above
Explanation: The specific heat of vaporization of water plays an important role in the regulation of heat produced by OxidationSpecific heat of…
Correct answer: Oxidation- A. Nonpolar covalent bonds
- B. Polar covalent bonds
- C. Hydrogen bonds
- D. Covalent bonds
Explanation: For water to vaporize (turn from a liquid into a gas), the type of bond that must be broken is Hydrogen bondsWater molecules are held…
Correct answer: Hydrogen bonds- A. Neurospora.
- B. Aspergillus.
- C. Griseofulvin.
- D. Lovastatin.
Explanation: Statins are the most common medicine for high cholesterol. They reduce the amount of cholesterol your body makes.
Correct answer: Lovastatin.- A. Soybean.
- B. Digitalis lanata
- C. Cinchona ledgeriana.
- D. Luceferin.
Explanation: Quinine is a bitter compound that comes from the bark of the cinchona tree.
Correct answer: Cinchona ledgeriana.- A. DNA polymerase I
- B. DNA ligase
- C. DNA polymerase ITI
- D. Taq polymerase
Explanation: Explanation:Taq polymerase is very thermo stable as it is derived from bacteria Thermophilus aquaticus that lives in hot geysers.
Correct answer: Taq polymerase- A. Wheat Plant
- B. Tobacco Plant
- C. Rice Plant
- D. Corn Plant
Explanation: Explanation:Tobacco plants are commonly used for producing antigens to treat non-hodgkin lymphoma.Wheat is not commonly used for producing…
Correct answer: Tobacco Plant- A. Ribosomes
- B. Plasmids
- C. Nucleoids
- D. Mesosomes
Explanation: Explanation:This option is correct because plasmids are one of the most useful and important vectors.
Correct answer: Plasmids- A. Restriction enzymes
- B. cDNA (complementary DNA)
- C. Vector
- D. Reverse transcriptase
Explanation: [A] Restriction enzymes recognize a specific sequence of nucleotides in double stranded DNA and cut the DNA at a specific location [B]…
Correct answer: Reverse transcriptase- A. pSC 101
- B. pCR 101
- C. pBR 322
- D. pBR 233
Explanation: [A] pSC101 has antibiotic resistance for tetracycline only[C] pBR322 has antibiotic resistance gene for both Tetracycline and…
Correct answer: pBR 322- A. Cultural Control
- B. Biological Control
- C. Pesticides Control
- D. Insecticides Control
Explanation: Control of pests by means of introducing natural predators or diseases affecting the pests comes under the umbrella of biological control.
Correct answer: Biological Control18597. A method in which pests are destroyed by using same living organisms or natural enemies is called
- A. Pasteurization
- B. Integrated disease management
- C. Biological control
- D. Genetic engineering
Explanation: Control of pests by means of introducing natural predators or diseases affecting the pests comes under the umbrella of biological control.
Correct answer: Biological control- A. Antigen
- B. Biocidal
- C. Antiseptics
- D. Antibiotics
Explanation: Antibiotics are chemicals which are produced by micro-organisms, and are particularly adept at destroying bacteria
Correct answer: Antibiotics- A. Clonal plants
- B. Transgenic plants
- C. Biotech plants
- D. Tissue cultured plants
Explanation: The term transgenic indicates an organism that contains genetic material from a foreign source.
Correct answer: Transgenic plants- A. Complementary DNA
- B. Recombinant DNA
- C. Chimeric DNA
- D. Plasmid DNA
Explanation: The DNA molecule formed from messenger-RNA (mRNA) by reverse transcriptase is called complementary DNA (cDNA).
Correct answer: Complementary DNA