DNA Technology and PCR Concepts

Recombinant DNA technology is crucial in modern agriculture and medicine, helping to develop better crops and produce medicines for diseases like sickle cell anemia. The process involves isolating DNA, fragmenting it with restriction enzymes, and amplifying it using PCR. These steps are essential for genetic studies and are carried out using specific techniques.

What is one of the primary roles of recombinant DNA technology in agriculture?

• To reduce the need for fertilizers

• To enhance the color of flowers

• To develop drought-resistant crops

• To increase the size of fruits

Which disease is mentioned as being treatable with medicines produced through recombinant DNA technology?

• Asthma

• Diabetes

• Hypertension

• Sickle cell anemia

What is the first step in recombinant DNA technology?

• Fragmentation of DNA

• Insertion of DNA into a host

• Isolation of genetic material

• Amplification of DNA

Which enzyme is used to cut DNA at specific sites during the fragmentation process?

• Helicase

• Restriction endonuclease

• Ligase

• DNA polymerase

What is the purpose of gel electrophoresis in DNA technology?

• To amplify DNA

• To separate DNA fragments by size

• To insert DNA into a host

• To synthesize new DNA strands

What is the main function of the enzyme Taq polymerase in PCR?

• To cut DNA strands

• To synthesize new DNA strands

• To join DNA fragments

• To denature DNA

At what temperature does the denaturation step of PCR occur?

• 37°C

• 95°C

• 72°C

• 55°C

How many copies of DNA can be produced after 30 to 40 cycles of PCR?

• Millions

• Thousands

• Billions

• Hundreds

What is the role of a thermocycler in PCR?

• To cut DNA

• To alter the temperature for DNA denaturing and synthesis

• To visualize DNA fragments

• To isolate DNA

Which of the following is NOT a step in the initial stages of recombinant DNA technology?

• Isolation of DNA

• Fragmentation by restriction endonuclease

• Amplification of gene of interest

• Insertion into a host cell