Benzene, a known carcinogen, mutates a sequence of dna in a gene. the previous sequence contained tac ggc acg ttt att, and the mutation caused the seventh nucleotide (with an adenine base) to be replaced by a nucleotide with a cytosine base. how will the final mutated polypeptide be different from the original polypeptide?

This would change the type of amino acid in the third position of the polypeptide chain. ACG codon codes for Threonine while CCG codes for Proline. This mutation will change the conformation of the protein especially because threonine is a polar amino acid (hydrophilic) while proline is hydrophobic

Label X is Nucleus ; Eukayotic cell ; Label W is Chloroplast  

Explanation:

The given image is a eukayotic cell as it has well defined nucleus and membrane bound cell organelles such as nucleus, mitochondria, chloroplast.

The label X is nucleus, It contains genetic material and it controls all the activities of the cell.  

The label W is chloroplast. It is a type of plastids which contains chlorophyll.  It prepares food for the plants through photosysnthesis.

Presence of chloroplast and cell wall shows that the image is of a typical plant cell.