g A polypeptide has the following amino acid sequence: Met-Ala-Gln-Arg-Glu-Leu. This polypeptide was mutated to produce the foll
owing mutant sequence: Met-Ala- Gln-Gly-Glu-Leu. Which describes the MOST likely type of mutation that occurred? A) nonsense mutation B) missense mutation C) frameshift mutation D) loss-of-function mutation E) neutral mutation
Missense mutation can be defined as the genetic mutation whereby a change occurs in a single amino acid sequence of a protein.
A missense mutation is a error that is observed in the DNA which is as a result of a wrong amino acid being added to into a protein because of change that was experienced. That single DNA sequence change, results in the formation of a different amino acid codon which the ribosome in living organisms recognizes.
A type of base substitution that results in the replacement of one amino acid by another is called missense mutation. Missense mutations affect the mutated proteins in several ways. It may alter the amino acid composition of the active site of enzymes and render the enzymes inactive.
The wild type polypeptide chain has the following sequence of amino acids: Met-Ala-Gln-Arg-Glu-Leu. The mutated polypeptide has glycine in place of arginine. The rest of the amino acids are the same in wild type and mutated protein. This means that the mutation changed the genetic code of arginine into the genetic code of glycine resulting in the incorporation of glycine in position 4. This is an example of a missense mutation.
Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight. Because animals get sugar from the food they eat, they do not need chloroplasts: just mitochondria.
