DSA 11
What are the stop codons? And start codons? - answerUAG; UAA; UGA
AUG- Met
What are the characteristics of the genetic code? (4) - answer1. unambiguous
2. degenerate
3. universal
4..non-overlapping
2 types of mutations - answer1. point mutation
a. silent
b. missense
c. nonsense
2. frameshift mutation
Explain missense, nonsense and silent mutation - answer1. Missense: results in
incorporation of a different amino acid
2. Nonsense: formation of stop codon
3. Silent: specifies the same amino acid
What happens in a frameshift mutation? - answerInsertion or deletions change the
reading frame. All amino acids after will be different
Example of frame shift mutation - answer"Read through" a termination codon to results
in a really long protein
Ex: Abnormal Hb Wayne
What are the characteristics of tRNA? - answer1. Single RNA strand of about 80
nucleotides
2. 4 segments - cloverleaf
3. guanylate residue (GGG) at 5' end
4. CCA at the 3' end is the amino acid binding site
5. L-shaped when 3-D because of H-bonds.
What are the stop codons? And start codons? - answerUAG; UAA; UGA
AUG- Met
What are the characteristics of the genetic code? (4) - answer1. unambiguous
2. degenerate
3. universal
4..non-overlapping
2 types of mutations - answer1. point mutation
a. silent
b. missense
c. nonsense
2. frameshift mutation
Explain missense, nonsense and silent mutation - answer1. Missense: results in
incorporation of a different amino acid
2. Nonsense: formation of stop codon
3. Silent: specifies the same amino acid
What happens in a frameshift mutation? - answerInsertion or deletions change the
reading frame. All amino acids after will be different
Example of frame shift mutation - answer"Read through" a termination codon to results
in a really long protein
Ex: Abnormal Hb Wayne
What are the characteristics of tRNA? - answer1. Single RNA strand of about 80
nucleotides
2. 4 segments - cloverleaf
3. guanylate residue (GGG) at 5' end
4. CCA at the 3' end is the amino acid binding site
5. L-shaped when 3-D because of H-bonds.
