BIO 105 FINAL EXAM TEST QUESTIONS WITH ACCURATE SOLUTIONS
wobble base pairing
pairing between 2 nucleotides in RNA molecules that does not follow watson-crick base
pair rules
-one tRNA can pair with more than one synonymous codon through wobble base pairing
what are the three sites that tRNAs matching successive codons are bound to at any one
time?
amino acid site
polypeptide site
exit site
stages of translation:
initiation
small subunit binds first and finds AUG
a set of initiation factors help for the initiation complex
stages of translation:
elongation
an amino-acid charged tRNA matching the next codon binds the A site
, large subunit used its peptidyl transferase activity to catalyze peptide bond formation-
transferring the amino acid in the P site onto the amino acid in the A site
-empty tRNA moves from P to E site then exits
tRNA bearing the growing protein translocates from A to P site
*whole process is repeated until entire protein is translated
stages of translation
termination
no tRNA matches stop codon
-instead a release factor binds A site
-causes peptide to be released from tRNA in P site
-entire complex comes apart
when many ribosomes translate a single mRNA at once it's called _____
polysome
mistakes that can happen with DNA
-mistakes in replication (S-phase)
-mistakes during recombination (meiosis 1)
-ultraviolet light
wobble base pairing
pairing between 2 nucleotides in RNA molecules that does not follow watson-crick base
pair rules
-one tRNA can pair with more than one synonymous codon through wobble base pairing
what are the three sites that tRNAs matching successive codons are bound to at any one
time?
amino acid site
polypeptide site
exit site
stages of translation:
initiation
small subunit binds first and finds AUG
a set of initiation factors help for the initiation complex
stages of translation:
elongation
an amino-acid charged tRNA matching the next codon binds the A site
, large subunit used its peptidyl transferase activity to catalyze peptide bond formation-
transferring the amino acid in the P site onto the amino acid in the A site
-empty tRNA moves from P to E site then exits
tRNA bearing the growing protein translocates from A to P site
*whole process is repeated until entire protein is translated
stages of translation
termination
no tRNA matches stop codon
-instead a release factor binds A site
-causes peptide to be released from tRNA in P site
-entire complex comes apart
when many ribosomes translate a single mRNA at once it's called _____
polysome
mistakes that can happen with DNA
-mistakes in replication (S-phase)
-mistakes during recombination (meiosis 1)
-ultraviolet light
