Posted in Health-01-01 by admin
on October 12, 2006
Three Lac
Lac gene operon consistis of Lac Z,Y and A?
The E. coli lac operon consists of 3 genes (lacZ, Y, and A).
Which of the following would you predict regarding expression of the
lac operon.
a) Three mRNAs of different lengths (one for each gene) will be made
b) Three start codons (one for each gene) will be used
c) A single stop codon will be used
a and b
a and c
f) b and c
g) a, b, and c
h) none of the above
The lac operon is transcribed in a single messenger RNA molecule. So answer a) is incorrect. Each gene will have a start codon AND a stop codon. So answer b) is correct, and answer c) is incorrect.
Only b) is correct.
http://books.google.com/books?id=xETyBqxHCWEC&pg=PA129&lpg=PA129&dq=lac+operon+stop+codon&source=web&ots=nvUg_t4Wrr&sig=tVwHYzkJR_4vpdimBoL9od8AyUw&hl=en&sa=X&oi=book_result&resnum=6&ct=result
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