Question

1. which technique is used to combine dna from different sources?

a. cloning
b. recombinant dna technology
c. gene therapy
d. gene editing

1. what real - world application exemplifies the use of genetic engineering to combat vitamin a deficiency?

a. production of biodegradable plastics
b. enhancement of crop resilience
c. creation of genetically modified mosquitoes
d. development of golden rice with enhanced nutritional value

1. what is the primary focus of gene editing techniques such as crispr - cas9?

a. modifying existing genes precisely
b. replicating entire organisms
c. cutting dna at targeted locations
d. inserting specific genes into dna

Explanation:

Question 4

• Option a: Cloning is about producing genetically identical copies of an organism or DNA fragment, not combining DNA from different sources.
• Option b: Recombinant DNA technology involves combining DNA from different sources (e.g., inserting a gene from one organism into the DNA of another) to create recombinant DNA.
• Option c: Gene therapy is about treating diseases by introducing or modifying genes in a patient's cells, not primarily about combining DNA from different sources.
• Option d: Gene editing is about making precise changes to an organism's DNA (like adding, removing, or altering DNA sequences), not the initial combination of DNA from different sources.

• Option a: Production of biodegradable plastics is related to biotechnology for plastic production, not combating Vitamin A deficiency.
• Option b: Enhancement of crop resilience (like drought or pest resistance) is a general genetic engineering application but not specific to Vitamin A deficiency.
• Option c: Genetically modified mosquitoes are for controlling disease transmission (like malaria), not related to Vitamin A deficiency.
• Option d: Golden Rice is genetically engineered to have enhanced levels of beta - carotene (which the body converts to Vitamin A), so it is a real - world application to combat Vitamin A deficiency.

• Option a: Gene editing techniques like CRISPR - Cas9 allow for precise modification of existing genes (such as deleting, inserting, or replacing DNA sequences within a gene).
• Option b: Replicating entire organisms is cloning, not what gene editing techniques like CRISPR - Cas9 focus on.
• Option c: While CRISPR - Cas9 does cut DNA at targeted locations, the primary focus is on the subsequent modification of the genes (the cutting is a means to an end of precise gene modification).
• Option d: Inserting specific genes into DNA can be part of recombinant DNA technology. Gene editing is more about modifying existing genes rather than just inserting new ones.

Answer:

b. Recombinant DNA technology

Question 5