The type of WBC that is the first to respond to bacterial infection and performs phagocytosis is:
A. Neutrophil
B. Lymphocyte
C. Eosinophil
D. Basophil
Answer: Option A
Solution (By JKSSB Mock Tests)
Neutrophils are the most abundant white blood cells and are part of the innate immune system. They quickly migrate to infection sites, where they phagocytose bacteria and release antimicrobial substances. Lymphocytes are for adaptive immunity, eosinophils combat parasites, basophils release histamine.
Explanation:
Vitamin K is a cofactor for γ-glutamyl carboxylase, which modifies glutamate residues in clotting factors, enabling calcium binding and coagulation.
Explanation:
Polymerase chain reaction (PCR) uses Taq polymerase, primers, and thermal cycling to make millions of copies of a specific DNA sequence. Southern blotting detects DNA, electrophoresis separates, sequencing reads bases.
Explanation:
Bt brinjal is a transgenic eggplant (brinjal) developed by inserting the cry1Ac gene from the soil bacterium Bacillus thuringiensis (Bt). This gene codes for a crystal protein that is toxic to the larvae of the brinjal fruit and shoot borer (Leucinodes orbonalis), a major pest that causes significant yield loss. When the insect ingests the plant tissue, the alkaline gut activates the toxin, creating pores in the gut lining and killing the pest.
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