The energy currency of the cell is: MCQ with Answer and Explanation

Explanation:
Immunoglobulin E (IgE) is present in very low concentrations in the blood but plays a central role in Type I hypersensitivity (allergic) reactions. When an allergen binds to IgE antibodies attached to mast cells and basophils, it triggers the release of inflammatory mediators like histamine, causing symptoms like itching, swelling, and anaphylaxis.

Explanation:
Ringworm (tinea) is a superficial fungal infection caused by dermatophytes (genera Trichophyton, Microsporum, Epidermophyton) that infect skin, hair, and nails. It is not a worm. Bacterial skin infections include impetigo, viral include warts, protozoan include leishmaniasis. Fungi are treated with antifungal agents.

Explanation:
Streptococcus thermophilus and Lactobacillus bulgaricus are used as starter cultures in yogurt production. They ferment lactose to lactic acid, causing milk proteins to coagulate, giving yogurt its thick texture and tangy taste. Bacillus cereus causes food poisoning, E. coli can be pathogenic, Salmonella causes typhoid.