<h2>Option a) is correct</h2>
Explanation:
Growing improved crop plants that have nitrogen fixing enzymes
- Nitrate pollution occurs because of the introduction of excessive amounts of nitrogen to ground water and surface water
- Use of synthetic fertilizers has resulted in high levels of pollution and eutrophication of lakes and rivers
- When nitrogen fertilizers are leached deep down into the soil they cause serious pollution problems
- Plants that can do nitrogen fixation include members of family Fabaceae
- The symbiotic association between legumes and Rhizobium is the most important nitrogen fixing association; rhizobia bacteria convert nitrogen gas to ammonia and this process is called nitrogen fixation
The answer is D. Species A will have fewer phenotypes.
Alleles are alternative forms of a gene. In species A, the leaf color is controlled by two alleles, for example, P and Q. They will have three possible genotypes - PP, PQ, and QQ. Three different genotypes give maximum three phenotypes.In species B, leaf color is controlled by three alleles, for example, L, M, and N. They will have six different genotypes - LL, LM, LN, MM, MN, and NN. Six different genotypes give maximum 6 phenotypes.
The resulting amino acid sequence would be a polypeptide chain in ribosomes which will be a primary structure of the protein. Folding of the protein and transport to the vesicles will take place in Endoplasmic reticulum. The proteins are then sorted and packaged for secretion.
From the sequence of the amino acid via primary structure and consequently the stabilised secondary structure of protein is formed.
Answer:
Spermiogenesis
Explanation:
Spermiogenesis is the stage during which the haploid spermatids are matured into sperms. It does not include any cell division.
The process of spermiogenesis includes elongation of spermatids and formation of acrosome at the top of its nucleus. A flagellum develops to make it a motile cell. There is an increase in the number of mitochondria while the excess of the cytoplasm is released outside.
All these events mature the haploid spermatid into a sperm cell having the capacity to reach and fertilize the egg.
