Biotechnology Practice Questions
20 free Biotechnology practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Biotechnology primarily involves the use of living organisms to:
- A Study planetary motion
- B Develop useful products and processes
- C Measure atmospheric pressure
- D Generate electricity directly
Correct answer: Develop useful products and processes
Biotechnology applies biological systems, organisms, or derivatives to create useful products. It is used in medicine, agriculture, and industry. Examples include vaccine production and genetically modified crops.
In biotechnology, which class of biomolecule carries an organism's hereditary information?
- A Protein
- B Fat
- C DNA
- D Carbohydrate
Correct answer: DNA
DNA stores the hereditary instructions of an organism, which is why recombinant DNA technology, gene cloning and genetic modification all work by cutting, joining and inserting DNA sequences. Proteins carry out the instructions rather than storing them, while fats and carbohydrates serve structural and energy roles and carry no heritable code.
Recombinant DNA technology involves:
- A Destroying genetic material
- B Combining DNA from different organisms
- C Observing cells under a microscope
- D Measuring blood pressure
Correct answer: Combining DNA from different organisms
Recombinant DNA technology combines DNA from different sources to create new genetic combinations. This allows scientists to produce proteins like insulin. It is a foundational biotechnology technique.
Which enzyme is commonly used to cut DNA at specific sequences?
- A Ligase
- B Amylase
- C Restriction enzyme
- D Helicase
Correct answer: Restriction enzyme
Restriction enzymes cut DNA at specific nucleotide sequences. They act like molecular scissors. These enzymes are essential in genetic engineering.
DNA ligase is used in biotechnology to:
- A Cut DNA strands
- B Join DNA fragments together
- C Unwind DNA
- D Copy RNA
Correct answer: Join DNA fragments together
DNA ligase joins DNA fragments by forming phosphodiester bonds. It is used to connect inserted genes into plasmids. This step is crucial in recombinant DNA formation.
A plasmid is best described as:
- A A viral protein
- B A circular piece of bacterial DNA
- C A plant hormone
- D A human chromosome
Correct answer: A circular piece of bacterial DNA
Plasmids are small circular DNA molecules found in bacteria. They replicate independently of chromosomal DNA. In biotechnology, plasmids act as vectors to carry foreign genes.
Genetically modified organisms (GMOs) are organisms that:
- A Develop naturally without genes
- B Have altered genetic material using biotechnology
- C Are grown only in laboratories
- D Cannot reproduce
Correct answer: Have altered genetic material using biotechnology
GMOs have their DNA modified using genetic engineering techniques. These modifications may enhance traits such as pest resistance. GMOs are used in agriculture and medicine.
Which biotechnology technique amplifies specific DNA segments?
- A Electrophoresis
- B Polymerase Chain Reaction (PCR)
- C Chromatography
- D Filtration
Correct answer: Polymerase Chain Reaction (PCR)
PCR amplifies specific DNA sequences rapidly. It allows scientists to produce millions of copies of a DNA fragment. This technique is widely used in diagnostics and research.
CRISPR-Cas9 technology is primarily used for:
- A Measuring enzyme activity
- B Editing genes with precision
- C Separating proteins
- D Producing fertilizers
Correct answer: Editing genes with precision
CRISPR-Cas9 is a gene-editing tool that allows precise modification of DNA sequences. It can add, remove, or alter genes. This technology has applications in medicine and agriculture.
Which microorganism is commonly used to produce insulin using biotechnology?
- A E. coli
- B Yeast only in nature
- C Virus
- D Algae
Correct answer: E. coli
E. coli bacteria are engineered to produce human insulin. Recombinant DNA technology inserts the insulin gene into the bacterial plasmid. This method ensures large-scale insulin production.
Bioreactors are used in biotechnology to:
- A Store fossil fuels
- B Grow cells or microorganisms under controlled conditions
- C Measure radiation
- D Observe galaxies
Correct answer: Grow cells or microorganisms under controlled conditions
Bioreactors provide controlled environments for growing cells or microbes. They are used to produce enzymes, vaccines, and other biological products. Conditions like temperature and pH are carefully regulated.
Which field of biotechnology focuses on improving crops?
- A Red biotechnology
- B Green biotechnology
- C White biotechnology
- D Blue biotechnology
Correct answer: Green biotechnology
Green biotechnology deals with agricultural applications. It includes genetically modified crops and improved plant breeding. This field enhances food production and sustainability.
Gene therapy aims to:
- A Increase muscle strength
- B Treat diseases by correcting defective genes
- C Enhance plant growth only
- D Destroy all viruses
Correct answer: Treat diseases by correcting defective genes
Gene therapy involves inserting or correcting genes to treat genetic disorders. It targets the root cause of certain diseases. This approach offers potential cures for inherited conditions.
Which process is used to separate DNA fragments based on size?
- A Centrifugation
- B Gel electrophoresis
- C Distillation
- D Evaporation
Correct answer: Gel electrophoresis
Gel electrophoresis separates DNA fragments according to size. Smaller fragments move faster through the gel. This technique is widely used in molecular biology.
Monoclonal antibodies produced by biotechnology are used for:
- A Fuel production
- B Diagnosis and treatment
- C Metal extraction
- D Industrial wastewater treatment
Correct answer: Diagnosis and treatment
Monoclonal antibodies are engineered to target specific antigens. They are used in diagnostics and therapies for diseases like cancer. Biotechnology enables their large-scale production.
Which enzyme synthesizes DNA during PCR?
- A RNA polymerase
- B Taq polymerase
- C DNA ligase
- D Reverse transcriptase
Correct answer: Taq polymerase
Taq polymerase is a heat-stable enzyme used in PCR. It synthesizes new DNA strands during temperature cycling. Its stability at high temperatures makes PCR possible.
White biotechnology mainly focuses on:
- A Industrial applications
- B Medical research
- C Marine environmental studies
- D Agricultural crop improvement
Correct answer: Industrial applications
White biotechnology involves industrial processes using biological systems. It includes enzyme production and biofuel development. It promotes sustainable manufacturing.
Cloning in biotechnology refers to:
- A Determining the complete DNA sequence
- B Producing identical genetic copies
- C Transferring genes across species
- D Increasing mutation rates
Correct answer: Producing identical genetic copies
Cloning produces genetically identical copies of organisms or cells. It can involve reproductive or therapeutic methods. This technique is important in research and medicine.
Which of the following is commonly used as a marker gene in genetic engineering?
- A Antibiotic resistance gene
- B Hemoglobin coding gene
- C Structural collagen gene
- D Human pancreatic insulin gene
Correct answer: Antibiotic resistance gene
Antibiotic resistance genes are often used as markers to identify successful genetic transformations. Cells with the inserted gene survive in antibiotic-containing media. This helps select modified cells.
Blue biotechnology is mainly associated with:
- A Marine and aquatic resources
- B Agricultural crop science
- C Medical and pharmaceutical research
- D Industrial waste management
Correct answer: Marine and aquatic resources
Blue biotechnology focuses on marine and aquatic organisms. It explores resources from oceans for pharmaceuticals and bio-products. This field expands biotechnology applications to marine ecosystems.