Which 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.
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An animal leaves its footprint in wet mud, and later, when the mud dries, the footprint can be filled with plaster. When the plaster hardens it has the same shape as the foot of the animal. The plaster cast could then be used to make new footprints in soft mud identical to those made by the animal. The process of using the plaster cast to make new footprints most accurately models –
A. translation of mRNA codons to form a protein.
B. transcription of mRNA from the original DNA code.
C. insertion of nucleotides into the mRNA codons.
D. deletion of nucleotides from the tRNA anticodons.