A codon Question 6 options: corresponds to a particular amino acid. consists of four nucleotides. consists of discrete amino acid regions. catalyzes RNA synthesis.

corresponds to a particular amino acid

Explanation:

All living organisms/cells consists of DNA, which encodes or stores genetic information. The DNA is made up of nucleotide bases, whose order determines the order of the nucleotides in the transcript mRNA. The mRNA is read in a group of three nucleotide sequences called CODON. Each codon specifies an amino acid i.e. codes for a specific amino acid in the genetic code.

There are about 64 possible codons made from 4 nucleotides that are read three at a time i.e. 4^3=64.

Option (B).

Explanation:

Natural selection may be defined as the process by which organisms adapt better in their environment, reproduce and produce their offsprings. Charles Darwin proposed the theory of natural selection.

According to Darwin, the natural selection may occur in the population if there is change in the natural environment of an organism. Large number of organisms may die due to the environment change but some members can survive and may adapt in that environment. Organism reproduce and pass down favorable traits onto their offspring.

Thus, the correct answer is option 2.