All Free Biology MCQs with Answers

• A. Mustard
• B. Wheat
• C. Corn
• D. Sunflower

Explanation: Protein / starch contents are improved in Cereals, potatoes, soybeans, rice, corn.

• A. Mustard
• B. Sugarcane
• C. Arabidopsis
• D. Sunflower

Explanation: Salt tolerant plants are Cereals, rice, sugarcane.

• A. 40%
• B. 50%
• C. 60%
• D. 70%

Explanation: Crop production is limited by effects of salinization at about 50% of irrigated levels. The next step to solve this problem is to produce salt-tolerant crops.

• A. Tobacco
• B. Soya bean
• C. Cotton
• D. Sunflower

Explanation: Tens of grams of a-galactosidase, an enzyme that can be used to treat a human lysosome storage disease, were harvested per acre of tobacco plants.

• A. Transfer of gene from one organism to other
• B. It produces insulin
• C. It is used to alter the genotype
• D. All of the above

Explanation: Biotechnology also extends beyond multicellular organisms. It is now possible to alter the genotype and subsequently the phenotype of plants and animals. Indeed, gene therapy in humans, attempting to repair a faulty gene is already undergoing clinical trials.

• A. The cloning of gene of interest
• B. The genes of interest are cut down
• C. The genes of interest are introduced into expression system
• D. None of the above

Explanation: In order to produce recombinant DNA, the following are required: 1. Gene of interest, which is to be cloned. 2. Molecular scissors to cut out the gene of interest. 3. Molecular carrier or vector, on which gene of interest could be placed. 4. The gene of interest along with the vector is then introduced into an expression system, as a result of which a specific product is made.

• A. Part of DNA pieces
• B. Clone of bacteria with pieces of DNA
• C. Segments of chromosomes
• D. None of the above

Explanation: A genomic library is a collection of bacterial or bacteriophage clones, each clone containing a particular segment of DNA from the source cell.

• A. Fragment of DNA
• B. Fragment of proteins
• C. Fragment of RNA
• D. None of the above

Explanation: Restriction fragment length polymorphism (abbreviated RFLP) refers to differences (or variations) among people in their DNA sequences at sites recognized by restriction enzymes. Such variation results in different sized (or length) DNA fragments produced by digesting the DNA with a restriction enzyme

• A. Diagnosis of diseases
• B. Uses to identifying rape victim
• C. Disputed parenthood
• D. None of the above

Explanation: PCR amplification and analysis can be used (1) to diagnose viral infections, genetic disorders, and cancer (2) in forensic laboratories to identify criminals; and (3) to determine the evolutionary history of the human population.

• A. Used in recombinant DNA technology
• B. Used in genomic library
• C. Used in identification of criminals
• D. Used in gene therapy

Explanation: DNA fingerprints have been presented as forensic evidence. A criminal in a deserted place assaulted a woman. She scratched his face in her defense, but he murdered her and ran away. A forensic scientist recovered the murder's hair and skin cells from underneath her nails. They prepared DNA fingerprints from blood of the victim, from the murderer's skin and hair, and from three suspects' blood.