Answer:
Option (a).
Explanation:
Biological magnification may be defined as the increase in the concentration of the harmful chemicals at the top levels in the food chain. The chemical or substance may not get degraded and accumulate in the higher tropic levels.
These toxic chemicals pose greater problem to the environment. The toxic substance pose greater problem to the top level predators than the primary consumers because top predator directly feed on the primary consumers. The toxic chemicals get accumulate in their tissue.
Thus, the correct answer is option (a).
3- pollution
9- environment
4- drought
This are some that i figured out im trying out the rest
Answer:
B. preservation of advantageous genetic mutations
Explanation:
The process of natural selection involves the preservation of advantageous genetic mutation in a given population.
Natural selection is one of the key factors that ensures the evolution of organisms.
- Desired traits that are able to survive adverse conditions like disease, food shortage, natural disasters are favored by the process of natural selection.
- Traits that also undergo advantageous genetic mutation in order to get a competitive advantage is also accrued to natural selection.
Answer:
The same gene encodes both proteins by using different combinations of exons in the pre‑mRNA via alternative splicing.
Explanation:
According to the question, two different proteins (one with 56 amino acids and the other with 82 amino acids) are found to be encoded by the same gene. This is possible due to a process called ALTERNATIVE SPLICING.
Alternative splicing is a phenomenon whereby the protein-coding region of a gene called EXON is manipulated in such a way that variety of proteins emanate from a single gene. This manipulation includes the removal or inclusion of EXONS in the gene, so as to give rise to different combinations of mRNA, hence, different proteins will be translated from the different mRNA from the same gene.
In this case, exons were removed from one mRNA to have lesser amino acids (56) in the translated protein while exons were included in the other mRNA to have more amino acids (82).
