Mastering Protein Synthesis Through DNA and RNA

Miss W explains protein synthesis, covering transcription and translation processes. She solves practice problems involving amino acid sequences, thymine nucleotides, and DNA sequences, demonstrating how to use codon charts to determine corresponding proteins and amino acids.

What is the primary role of DNA in protein synthesis?

• To form the structure of ribosomes

• To provide instructions for protein synthesis

• To catalyze chemical reactions

• To transport amino acids

During transcription, which base does adenine pair with in RNA?

• Guanine

• Cytosine

• Thymine

• Uracil

What is the result of transcription?

• A protein molecule

• A messenger RNA strand

• An amino acid chain

• A DNA strand

How many nucleotides make up a codon?

• One

• Two

• Three

• Four

What amino acid does the codon GUA code for?

• Lysine

• Isoleucine

• Phenylalanine

• Valine

If a DNA sequence has 21 thymine nucleotides, how many adenine nucleotides will the mRNA have?

• 21

• 14

• 7

• 28

What is the amino acid coded by the codon AAA?

• Isoleucine

• Phenylalanine

• Lysine

• Valine

How many amino acids are coded by a DNA sequence with 15 nucleotides?

• 10

• 3

• 5

• 7

What does a stop codon signal in protein synthesis?

• The replication of DNA

• The beginning of translation

• The end of a protein chain

• The start of transcription

In the final problem, how many amino acids are coded before the stop codon is reached?

• Five

• Two

• Four

• Three