Answer:
d) a polypeptide missing an amino acid.
Explanation:
Deletion is a type of mutation when one or more codons from the reading frame are removed. This results in the production of a relatively shorter mRNA that lacks one or more codons otherwise present in the non-mutated mRNA. When there is a deletion of a single codon in the gene for cystic fibrosis, the resultant shorter mRNA codes for a polypeptide chain that does not carry one amino acid. For example, deletion of one codon results in deletion of a Phe residue present at position 508 in CFTR. The mutated transmembrane protein CFTR folds in an improper way.
This process is called endocytosis. Endo- means: within, inner, absorbing, or containing
Pat has likely been in the sun longer than John, since she/he works outside. Since she is outside longer, her/his skin has learned to adapt to it by producing more melanin to protect her/him. John doesn't go outside as much so his skin doesn't need to adapt to sun rays.
Sandpaper, a rough texture, granular texture
