Which of the following is a function of the kidneys?
O
A. To remove carbon dioxide from the blood and send it to the
urinary bladder
O
B. To catch toxins in the blood and send them to the liver
O
C. To catch nutrients that slipped away from the digestive system
O
D. To remove salts from the blood so osmosis works properly

A

Explanation: They help the body pass waste as urine. They also help filter blood before sending it back to the heart

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.