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DNA › ViewWhich of the following stages is the first step during the process of transcription?
A. A polypeptide strand is made.
B. Codons are read to produce an amino acid.
C. DNA is turned into an mRNA copy.
D. A section of DNA helix is unwound by an enzyme.
Digestive System › View
The kidneys filter the blood about ____ times per day.
A. 10
B. 20
C. 30
D. 40