Glucose is primarily reabsorbed in which part of the nephron? MCQ with Answer and Explanation

Explanation:
Nitrogen fixation, the conversion of atmospheric N2 to ammonia, is performed by certain bacteria and cyanobacteria (blue-green algae). Denitrification is the process where denitrifying bacteria convert nitrates in the soil back into nitrogen gas (N2), returning it to the atmosphere. Ammonification is the decomposition of organic nitrogen into ammonia by microbes; nitrification converts ammonia to nitrate. Thus, statements 1 and 2 are correct.

Explanation:
Blood group O lacks A and B antigens on red cells but contains both anti-A and anti-B antibodies in plasma. This makes it the universal donor for packed red cells but dangerous plasma donor. Group AB has no antibodies. So, the presence of both antibodies is correct.

Explanation:
The anticodon is a triplet of nucleotides on the tRNA molecule that base-pairs with the complementary codon on mRNA during translation, ensuring correct amino acid incorporation. Codons are on mRNA, promoters are DNA sequences for transcription initiation, exons are coding regions in eukaryotic genes.