Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?

$A$ single base mutation in a gene may not 'always' result in loss or gain of function. Do you think the statement is correct? Defend your answer.

Identify the correct pair of codon and its corresponding amino acid.

The codons on $mRNA$ are $CAU-CCU-AAA-CUG$. Identify the correct sequence of amino acids.

For the genetic code,choose the correct option for the given statements. Where $T$ stands for True and $F$ stands for False.
$(1)$ Phenylalanine $(Phe)$ amino acid is coded by more than three codons.
$(2)$ The codon is read in $t-RNA$ in a contiguous fashion.
$(3)$ $UUC$ would code for phenylalanine.
$(4)$ $AUG$ codes for Methionine.

How many base additions or deletions do not change the reading frame?