Bio chapt 17-20

What are the two steps involved in a gene expressing forming a specific polypeptide

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Terms in this set (13)

What are the two steps involved in a gene expressing forming a specific polypeptide

1) Transcription
2) Translation

Copies information from a DNA sequence (a gene) to a complementary RNA sequence

Converts RNA sequence to amino acid sequence of a polypeptide

RNA
(Ribonucleic Acid)

• Usually one polynucleotide strand
• The sugar is ribose
• Contains Uracil (U) instead of Thymine (T)

What are the three kinds of RNA in protein synthesis?

• Messenger RNA (mRNA)
• Transfer RNA (tRNA)
• Ribosomal RNA (rRNA)

Messenger RNA (mRNA)

Carries copy of a DNA sequence to site of protein synthesis at the ribosome

Transfer RNA (tRNA)

Carries amino acids for polypeptide assembly

Ribosomal RNA (rRNA)

Catalyzes peptide bonds and provides structure

Non-cellular particles that reproduce inside cells; many have RNA instead of DNA

Reverse Transcription

Synthesis of DNA from RNA