Understanding DNA Mutations and Codons

If a DNA sequence is ATGC, what would be the corresponding RNA sequence?

• TACG

• UACG

• AUGC

• AUCG

Using the provided codon wheel, what amino acid does the RNA codon CUA code for?

• Leucine (Leu)

• Proline (Pro)

• Histidine (His)

• Arginine (Arg)

What is the primary function of a stop codon during protein synthesis?

• To initiate the translation process.

• To signal the end of the amino acid chain.

• To change the type of amino acid being added.

• To repair errors in the RNA sequence.

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When a single nucleotide base in a DNA sequence is replaced by a different base, what type of mutation has occurred?

• Frameshift mutation

• Deletion mutation

• Insertion mutation

• Substitution mutation

What type of mutation occurs when a single nucleotide substitution in the DNA sequence leads to a premature stop codon in the mRNA?

• Missense mutation

• Nonsense mutation

• Silent mutation

• Frameshift mutation

If an 'A' nucleotide is inserted into the DNA sequence TTC GCT ATT after the first 'C', what would be the second amino acid coded for in the resulting mRNA sequence?

• Arginine

• Serine

• Isoleucine

• Lysine

What is the primary consequence of a frameshift mutation on the resulting protein?

• Only one amino acid is changed

• The protein's function remains unchanged

• The entire reading frame shifts, leading to multiple altered amino acids

• The mutation is always silent

Which statement best describes the overall impact of mutations in biological systems?

• All mutations are harmful and lead to disease

• Mutations always result in non-functional proteins

• Mutations are always beneficial for evolution

• Mutations can be harmful, neutral, or beneficial, contributing to genetic variation