The hormone that stimulates the Leydig cells to produce testosterone is: MCQ with Answer and Explanation

Explanation:
Streptomycin is an antibiotic produced by the bacterium Streptomyces griseus. Penicillin and cephalosporins are from fungi (Penicillium and Cephalosporium). Griseofulvin is a fungal antibiotic. Streptomycin is a broad-spectrum aminoglycoside, effective against gram-negative bacteria and Mycobacterium tuberculosis. It inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit.

Explanation:
Colostrum, the first milk produced by the mother, is rich in IgA antibodies, providing natural passive immunity to the newborn. Allergies (hypersensitivities) occur when the immune system overreacts to harmless environmental antigens (allergens). Autoimmune diseases arise when the immune system loses tolerance and mistakenly attacks the body's own healthy cells and tissues. All statements are correct.

Explanation:
Cellular respiration is a universal characteristic of living organisms, occurring in every cell to release energy from organic molecules. Movement is not universal (e.g., plants are stationary). Photosynthesis is restricted to autotrophs. A nervous system is absent in plants and simple animals. Thus, cellular respiration is fundamental to all life forms, from bacteria to humans.