Question: A mutant plant with white flowers exists that lacks red anthocyanin pigment, normally made by enz…

A mutant plant with white flowers exists that lacks red
anthocyanin pigment, normally made by enzyme P. Indeed the petal
tissue lacks all detectable activity for enzyme P. Despite the lack
of enzyme activity, a study of homozygous mutant cells using
antibodies against the wild-type enzyme demonstrated that the cells
homozygous for the mutation still had the enzyme (i.e., the
antibody showed the presence of the enzyme). Which statement below
could most likely explain these results?

      
A.The mutant had another gene the researcher was not aware of which
produced an enzyme that could function like the mutated
enzyme.
      
B.The mutant cells likely had large scale chromosomal mutations
that resulted in the expression of some gene similar to the gene
for enzyme P.
      
C.The mutant allele must have had a nonsense mutation that resulted
in complete formation of a non-functioning enzyme
      
D.The mutant allele must only have missense mutations that simply
knocked out enzyme function yet the enzyme would still bind to the
antibody
      
E.None of the answers is correct

Increased numbers of CAG repeats in the exon of a gene is
associated with certain diseases. The effect of increased numbers
of CAG repeats on the encoded protein is to:

      
A.to generate of a truncated protein
  
B.to generate an elongated protein
      
C.to generate a protein with a run of consecutive glutamines
      
D.to silence of the gene
      
E.none of the above