Which of the following microorganisms is used in the production of bread? MCQ with Answer and Explanation

Explanation:
In gymnosperms like Pinus, the female gametophyte develops within the ovule and serves as the nutritive tissue for the developing embryo. Unlike angiosperms, where the nutritive tissue is the triploid endosperm formed after double fertilization, the gymnosperm nutritive tissue is haploid and forms before fertilization. Therefore, the edible part of a pine seed is the haploid female gametophyte.

Explanation:
The cell membrane (plasma membrane) is primarily composed of a phospholipid bilayer with embedded proteins, following the fluid mosaic model. The cytoskeleton is a network of protein filaments (microtubules, microfilaments, intermediate filaments) that provides structural support, shape, and facilitates intracellular transport. Ribosomes are the site of protein synthesis, not lipid synthesis (which occurs in the smooth ER). Thus, statements 1 and 3 are correct.

Explanation:
Penicillin and other beta-lactam antibiotics (cephalosporins, carbapenems) inhibit the transpeptidase enzyme involved in cross-linking peptidoglycan, weakening the cell wall and causing bacterial lysis. Tetracycline and streptomycin inhibit protein synthesis by acting on ribosomes. Chloramphenicol also inhibits protein synthesis. Penicillin is most effective against actively dividing gram-positive bacteria.