Biotechnology practice focused on recombinant-DNA tools, processes and medical, agricultural and environmental applications. Every preview below comes from NeetVellum's live original bank—not an unverified PYQ reconstruction.
recombinant-DNA tools, processes and medical, agricultural and environmental applications.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 1 · difficulty 1/5
Rosie, the first transgenic cow, was genetically engineered to produce milk that is nutritionally more balanced for human babies than natural cow milk. Which human protein did her milk contain?
A. Human insulin
B. Human alpha-lactalbumin
C. Human growth hormone
D. Human serum albumin
Example 2 · difficulty 2/5
The Bt toxin produced by Bacillus thuringiensis is harmless to most organisms and remains inactive until ingested by the target insect. Why does the toxin become lethal only inside the insect's body?
A. The acidic pH of the insect's stomach converts the protoxin into its active form
B. Spores of B. thuringiensis germinate in the gut and release live bacteria that kill the insect
C. The alkaline pH of the insect's gut dissolves the crystals and gut proteases convert the inactive protoxin into active toxin
D. Sunlight activates the protoxin on the plant surface before the insect feeds
Example 3 · difficulty 2/5
In the first approved clinical gene therapy trial (1990) performed on a four-year-old girl suffering from adenosine deaminase (ADA) deficiency, lymphocytes collected from her blood were grown in culture and a functional ADA cDNA was introduced into them using:
A. A retroviral vector
B. The Ti plasmid of Agrobacterium tumefaciens
C. Direct microinjection of naked DNA
D. Calcium chloride-mediated transformation
The evidence-first practice loop
1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.