Question

Match Column I with Column II and select the correct option:

• A. a-iii, b-i, c-iv, d-ii
• B. a-iii, b-i, c-ii, d-iv
• C. a-i, b-iii, c-iv, d-ii
• D. a-i, b-iv, c-ii, d-iii

Hint:

In matching matrix questions, pick the most distinct terms first. For instance, "Downstream processing" uniquely refers to "separation and purification," and "Primers" are always "oligonucleotides." Finding even one or two of these matches will instantly narrow down or solve the entire question.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This problem requires matching key terms from biotechnology and genetic engineering listed in Column I with their correct functional descriptions listed in Column II.

Step 2: Detailed Explanation:
Let us evaluate each item in Column I one by one:
* a. Primers: In biotechnology, specifically during the Polymerase Chain Reaction (PCR), primers are essential components. They are defined as short, chemically synthesized oligonucleotides (usually about 18–22 nucleotides long) that are strictly complementary to the regions of the target template DNA strand. Therefore, a maps to iii.
* b. Insertional inactivation: This is a powerful selection method used to screen for recombinant plasmids. When a foreign gene of interest is cloned inside the coding sequence of an enzyme like $\beta$-galactosidase (encoded by the lacZ gene), the sequence is disrupted. As a result, the bacteria containing recombinant plasmids lose the ability to synthesize functional $\beta$-galactosidase and cannot produce a blue colour on X-gal media. Therefore, b maps to i.
* c. Bioreactor: A bioreactor is a large engineering vessel (typically holding 100 to 1000 liters) designed to provide optimal growth conditions (pH, temperature, oxygen, substrates) for the large-scale culture and production of specific proteins or metabolites by microbial, plant, or animal cells. Therefore, c maps to iv.
* d. Downstream processing: Once the biosynthetic stage in a bioreactor is finished, the product must go through a sequence of separation and purification steps before it can be formulated into a final market product. This post-fermentation phase is known as downstream processing. Therefore, d maps to ii.
Combining these mappings gives the sequence: a-iii, b-i, c-iv, d-ii.

Step 3: Final Answer:
The matching sequence is correctly represented by option (A).