Tyrosine is listed as a non-essential amino acid because it can be synthesised from the essential amino acid phenylalanine.
<u>Explanation:</u>
Amino acids are classified as essential and non essential according to whether they can be synthesized in the body itself or should be supplied by the diet. Essential amino acids cannot be synthesized in the body of the organism and thus can be obtained only from the diet. In the case of human beings, valine, phenylalanine, methionine etc are examples of essential amino acids.
Non essential amino acids can be synthesized within the body of the organism. Thus they need not be supplied by the diet. Alanine, aspartic acid etc are some of the non essential amino acids in human beings. It is given here that animals cannot synthesize tyrosine from shikimate-3p due to the lack of EPSP synthase.
But the amino acid tyrosine can be synthesized from the amino acid phenylalanine which is an essential amino acid. Thus tyrosine will be a non-essential amino acid.
Answer:
Answer is clearly explained in explanation.
Explanation:
In evolutionary biology, the convergent evolution is the process by which organisms from different evolutionary lines independently develop similar adaptations or features in response to similar environmental conditions. North American cacti and African euphoria are clear examples of this concept. Both types of plants have developed thick, juicy stems that are ideal for storing water and protecting thorns, and both are well suited to deal with the rain scarcity and dry climate of the desert regions. The two plant species belong to different plant families and are distant relatives in the phylogeny of flowering plants; However, their common characteristics indicate that they are the product of a converging evolution. The convergent development has enabled the two species of plants to develop similar adaptations to facilitate their survival in the hot and dry desert environment in which they live.
Answer:
b. A deep, narrow river divides a population of hummingbirds.
Explanation:
Hummingbirds can fly across the river. The deep and narrow river can not separate a population of hummingbirds into two patches since hummingbirds from one side of the river can fly and reach to the other side of the river.
Without any geographical isolation, hummingbirds can continue to interbreed among themselves. The continued interbreeding would not allow their reproductive isolation and thereby would prevent the allopatric speciation.
"RESPIRATION" causes the amount of carbon dioxide in the air to increase
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