All Free Biology MCQs with Answers

• A. Na+ ions
• B. Cl- ions
• C. Ca++ ions
• D. K+ ions

Explanation: Cystic fibrosis is a genetic disorder caused by a mutation in the cystic fibrosis trans-membrane conductance regulator (CFTR) gene.

• A. Parasitology
• B. Biochemistry
• C. Biotechnology
• D. Molecular biology

Explanation: The exploitation of biological process for industrial and other purposes, especially the genetic manipulation of microorganisms for the…

• A. Clone plants
• B. Transgenic plants
• C. Parthenocarpic plpants
• D. Mutant plants

Explanation: Transgenic plants are plants into which one or more genes from another species have been introduced into the genome, using genetic…

• A. Penicillin
• B. Streptomycin
• C. Sulfonamide
• D. Tetracycline

Explanation: Tetracycline is a short-acting antibiotic that inhibits bacterial growth by inhibiting translation.

• A. Ampicillin and aspirin
• B. Streptomycin and metronidazole
• C. Ampicillin and Tetracycline
• D. Penicillin and metronidazole

Explanation: Ampicillin is a medication used to manage and treat certain bacterial infections.

• A. Epithelial cells
• B. Endothelial cells
• C. Plasma cells
• D. Blood cells

Explanation: Cystic fibrosis is an autosomal recessive disease caused by the loss of function of cystic fibrosis transmembrane conductance regulator…

• A. Exonucleases
• B. Endonucleases
• C. Polymerases
• D. Reverse transcriptases

Explanation: Endonucleases also known as restriction enzymes are molecular scissors as they cleave DNA at or near specific sequences known as…

• A. Heating→ Cooling → Add Primer→ Copying of strand
• B. Heating→ Add Primer→ Cooling→ Copying of strand
• C. Add Primer →Heating→ Cooling →Copying of strand
• D. Cooling→ Add Primer→ Heating →Copying of strand

Explanation: Polymerase chain Reaction The polymerase chain reaction is a method widely used to rapidly make millions to billions of copies of a…

• A. Complementary DNA
• B. Mutated DNA
• C. Recombinant DNA
• D. Cloned DNA

Explanation: A recombinant Dna is a dna molecule from two different species that are inserted into host organism to produce new genetic combinations…

• A. lone DNA
• B. Recombinant DNA
• C. cDNA
• D. rDNA

Explanation: Recombination is the process through which a new gene is inserted into a bacterial DNA "The plasmid".

• A. Nitrogenous base
• B. Base sugar
• C. Phosphodiester bond
• D. Hydrogen bond

Explanation: The restriction endonucleases cuts the two strands of the double helix at specific point in the sugar phosphate backbone of DNA, it breaks…

• A. Endonuclease
• B. Urease
• C. Ligase
• D. Helicase

Explanation: Ligase is also known as molecular glue, responsible for the binding of two molecules, using ATP.

• A. Blunt ends
• B. Non-palindromic ends
• C. Sticky ends
• D. Split ends

Explanation: EcoRI is a restriction enzyme. Restriction enzymes either make staggered cuts or blunt cuts.

• A. Fungi
• B. Algae
• C. Bacteria
• D. Viruses

Explanation: Restriction endonucleases are also called restriction enzymes. They are naturally found in bacteria where they serve a host-defense role.

• A. Western blotting
• B. Northern blotting
• C. Autoradiography
• D. Gel electrophoresis

Explanation: Gel electrophoresis is a technique used in molecular biology to separate different-sized fragments of charge-bearing polymers (proteins…

• A. Taq-isomerase
• B. Taq-helicase
• C. Taq-polymerase
• D. Taq SSBp

Explanation: Taq-polymerase is a polymerase enzyme extracted from the heat-stable bacteria called Thermus aquaticus which lives in hot springs.

• A. Trans-membrane carrier
• B. Cl- ions
• C. Na+ ions
• D. Mucus membrane

Explanation: The trans-membrane carrier is responsible for allowing Chlorine ions to enter into the mucus so that water may follow due to osmosis…

• A. Probes
• B. Restriction endonuclease
• C. Mutated DNA
• D. Recombinant DNA

Explanation: Recombinant DNA (or rDNA) is made by combining DNA from two or more sources.DNA probes are stretches of single-stranded DNA used to detect…

• A. Eosinophils
• B. Neutrophils
• C. Monocytes
• D. Basophils

Explanation: Explanation:Heparin prevents blood clots and is released by Basophils. Hence, D is the correct option.

• A. Albumin
• B. Globulin
• C. Fibrinogen
• D. Prothrombin

Explanation: Option [A] The plasma proteins maintain colloidal osmotic pressure of blood.