The vitamin that is a coenzyme in the metabolism of carbohydrates and branched-chain amino acids is: MCQ with Answer and Explanation

Explanation:
R.H. Whittaker's five kingdom classification places all prokaryotic organisms in Kingdom Monera and unicellular eukaryotes in Kingdom Protista. Fungi are a distinct kingdom characterized by heterotrophic nutrition, primarily saprophytic or parasitic, and possess chitinous cell walls. They are not photosynthetic autotrophs. Therefore, statements 1 and 2 are correct, while 3 is incorrect.

Explanation:
Syphilis is caused by the spirochete bacterium Treponema pallidum, typically transmitted through sexual contact. It progresses through primary, secondary, latent, and tertiary stages, potentially causing severe neurological and cardiovascular damage if untreated. Gonorrhea is by Neisseria gonorrhoeae, herpes by HSV, chlamydia by Chlamydia trachomatis. Penicillin is an effective treatment.

Explanation:
Relaxin is a peptide hormone produced by the corpus luteum and the placenta during pregnancy. Its primary roles are to relax the smooth muscles of the uterus (inhibiting contractions to maintain pregnancy) and to soften and increase the flexibility of the connective tissues in the pelvis, specifically the pelvic ligaments and the pubic symphysis. This relaxation and widening of the pelvic joints facilitate the passage of the baby through the birth canal during delivery.