Which class of antibody is the most abundant in human blood plasma? MCQ with Answer and Explanation

Explanation:
Plasmodesmata are microscopic channels that traverse the cell walls of plant cells, enabling the transport of water, ions, molecules, and even some viruses between them, thus ensuring cytoplasmic continuity. Gap junctions perform a similar function in animal cells, while tight junctions and desmosomes are for sealing and adhesion, respectively.

Explanation:
Propionibacterium shermanii ferments lactate to propionic acid, acetic acid, and CO₂ during cheese ripening; the CO₂ forms the characteristic holes (eyes) in Swiss cheese. Lactobacillus and Streptococcus are starter cultures for acid production, Penicillium roqueforti is used for blue cheese.

Explanation:
Alfred Russel Wallace independently conceived the theory of natural selection and sent his manuscript to Darwin. In 1858, both presented their papers jointly at the Linnean Society. Darwin's 'On the Origin of Species' (1859) elaborated the theory. Mendel discovered genetics, Lamarck proposed inheritance of acquired traits, Malthus influenced Darwin with his ideas on population growth.