All Free Biology MCQs with Answers

• A. Treating anemia
• B. Bone marrow transplant
• C. Dissolving blood clot
• D. Treatment of cancer

Explanation: Tissue plasminogen activator (TPA) is primarily used for dissolving blood clots in medical emergencies.

• A. Four Parents
• B. Three Parents
• C. Two parents
• D. One Parent only

Explanation: Cloning is a mode of asexual reproduction through which genetically identical copies of an organism are produced.

• A. Genetic Engineering
• B. Hybridization
• C. Inbreeding
• D. Sequencing

Explanation: Hybridization involves the crossing of dissimilar individuals to bring together the best of both parents in the offspring.

• A. mutagenic
• B. transgenic
• C. glones
• D. sequencing

Explanation: An organism whose genome has been altered by the introduction of one or more foreign DNA molecules from another species by artificial…

• A. They cut DNA at specific base sequences
• B. They cut DNA at multiple random sites
• C. They help in joining the pieces of DNA
• D. They are a type of nuclease

Explanation: Restriction enzymes, also known as restriction endonucleases, are proteins that cut DNA at specific sequences called restriction sites.

• A. Transgenic
• B. Probe
• C. Recombinant
• D. Plasmid

Explanation: These plants and animals are called transgenic or genetically modified organisms, a probe is a single stranded DNA or RNA sequence used to…

• A. 60 oC
• B. 71 oC
• C. 50 oC
• D. 80 oC

Explanation: Pasteurization of milk, requires temperatures of about 63 °C (145 °F) maintained for 30 minutes or, alternatively, heating to a higher…

• A. 15 to 24.9
• B. 17.5 to 24.9
• C. 18.5 to 24.9
• D. 25 to 29.9

Explanation: Body Mass Index (BMI) is a calculation that considers an individual's weight in relation to their height to estimate body fat.

• A. Edward Jenner
• B. Louis Pasteur
• C. F. H. Herbor
• D. James Phipps

Explanation: Edward Jenner is credited with developing the first successful smallpox vaccine in 1796.

• A. pBR 322
• B. Npq 303
• C. oSR 210
• D. kMG 319

Explanation: The correct answer is pBR 322. Plasmids like pBR 322 are naturally occurring extrachromosomal DNA molecules in bacteria that have been…

• A. 1980
• B. 1982
• C. 1984
• D. 1986

Explanation: The first field trials of genetically engineered plants were conducted in 1986 in France and the USA, focusing on tobacco plants…

• A. Sterilization -> media preparation -> inoculation -> callus development -> plantlets
• B. Media preparation -> sterilization -> inoculation -> callus development -> plantlets
• C. Media preparation -> inoculation -> sterilization -> callus development -> plantlets
• D. Inoculation -> sterilization -> media preparation -> callus development -> plantlets

Explanation: The correct sequence of the tissue culture method is: Media preparation -> Inoculation -> Sterilization -> Callus development ->…

• A. Increased rate of cell division
• B. Immunization with antigen
• C. To avoid contamination
• D. As nutrient in media

Explanation: Multiple myeloma cells are abnormal plasma cells (a type of white blood cell) that build up in the bone marrow and form tumors in many…

• A. Southern blotting
• B. Northern blotting
• C. Western blotting
• D. All of the above

Explanation: The process where DNA fragments are transferred to a nylon sheet on a gel is called Southern blotting.

• A. Bacteria:
• B. Yeast:
• C. Algae:
• D. Either (A) or (B)

Explanation: Whey, the liquid part of milk that remains after the formation of curds during the cheese-making process, is rich in nutrients and can be…

• A. Streptomyces achrmpogene
• B. Serratia marcescens
• C. Streptococcus pyogens
• D. Staphylococcus aureus

Explanation: So, the restriction enzyme SmaI, which stands for Serratia marcescens enzyme, is derived from the bacterium Serratia marcescens.

• A. Gallbladder
• B. Liver
• C. Kidneys
• D. Lungs

Explanation: Fibrinogen is a protein produced by the liver, which plays a crucial role in blood clotting by being converted into fibrin during the…

• A. Liver
• B. Spleen
• C. Bone marrow
• D. Heart

Explanation: Blood cells are produced in the red bone marrow from hematopoietic stem cells.

• A. Leukaemia
• B. Polycythemia
• C. Edema
• D. Anemia

Explanation: Polycythemia is characterized by an abnormally high concentration of red blood cells in the bloodstream.

• A. Group A to Group B
• B. Group AB to Group O
• C. Group A to Group O
• D. Group B to Group AB

Explanation: Blood transfusions must be compatible, meaning donor blood antigens should not react with recipient blood antibodies.