Me! ! this is driving me insane! multiplying polynomials (x + y + 3)(x + y - 4) i have to place my answer to this in this: x_ _2x _ + _ _ _ x _ _ _ 1

Ok so you will have to expand it.
so in the first bracket the X Y and +3 will need to be multiplied to each of the variables in the second bracket.
so what you need to do is
X in the first bracket multiplied with X from the second bracket. then y then - 4
secondly you need to multiply the y from the first bracket to all the three.
finally multiply 3 to all the three variables.
after doing all that u should get x^2+xy-4x+xy+y^2-4y+3x+3y-12
then combine like terms and u get.
x^2+2xy-x-y+y^2-12

The process of translation or protein synthesis stops when the tRNA binds to any one of the three codons that are UGA, UAG or UAA.

These do not code for any amino acid therefore they send the signal for protein termination. The stop codon in the A site forces the peptidyl transferase to add the water molecule in the presence of release factors.

This frees the carboxyl end of the protein which holds the protein attached to the ribosome, therefore, the synthesised protein at that time is released into the cytoplasm.