Answer:
any change at the third codon position
Explanation:
The genetic code is considered to be degenerate because a single amino acid may be coded for more than one codon. In this case, Leucine (Leu) is an amino acid that can be encoded by four different codons: CUU, CUC, CUA and CUG codons. In consequence, all nucleotide changes (mutations) at the third codon position don't affect the synthesis of Leu. This type of mutation that does not alter the sequence of amino acids is called silent mutation.
Answer:
A compound microscope
Explanation:
A compound microscope is an instrument used to view the structure of the microscopic organism using the light source and the lenses.
The compound microscope contains an eyepiece which contains the ocular lens and the objective lenses n the nosepiece closer to the specimen.
To view the living organism of the ponds, a compound microscope especially a bright field microscope is used when the light from the lower portion brightens the sample and the object appears darker.
Thus, the compound microscope is the correct answer.
