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pg. 1 BISC205 Final Exam Latest Update Actual Exam Questions with Correct Verified Answers/ Graded A+
Anticodon - Correct Answer - amino acids at the opposite end of a transferring RNA with the complimentary bases to that the start of the sequence
ex: at start CGG
anticodon: GCC
Order of mRNA codons determines the order in which: - Correct Answer - tRNA brings in amino acids
Function of ribosomes in RNA formation - Correct Answer - -serves as binding sites for mRNA and 3 tRNAs -binding sites facilitate complementary base pairing between tRNA anticodons and mRNA codons -binding sites also bring amino acids in line in a specific order to form a polypeptide
polyribosome - Correct Answer - multiple copies of a polypeptide all in one complex
during translation, codons (mRNA) base pair with: - Correct Answer - anticodons (tRNA) carrying specific amino acids
5'3' order of codons determines: - Correct Answer - the order of tRNA entering the ribosome and the sequence of amino acids in a polypeptide
- steps of translation - Correct Answer - 1. initiation
- elongation
- termination 1 / 2
pg. 2
initiation - Correct Answer - brings all the translation components together at the start codon (AUG)
initiation factors - Correct Answer - assemble ribosome components
- tRNA binding sites on ribosomes - Correct Answer - peptide site, amino acid site, exit
site
elongation - Correct Answer - process by which the polypeptide increases in length (peptide bonds are made), occurs one amino acid at a time
elongation factors - Correct Answer - Facilitate the binding of tRNA anticodons to mRNA codons at the ribosome
1st step of elongation - Correct Answer - a tRNA with attached peptide is at the P site and a tRNA carrying the next amino acid is arriving at the A site
2nd step of elongation - Correct Answer - once the next tRNA is in place at the A site, the peptide chain will be transferred to this tRNA as another peptide bond is made
3rd step of elongation - Correct Answer - Energy and peptide transferase in the ribosome are needed to bring about this transfer. The energy contributes to peptide bond formation, which makes the peptide one amino acid longer by adding the amino acid from the A site
4th step of elongation - Correct Answer - translocation occurs, mRNA moves forward one codon length and the peptide bearing tRNA is now
termination - Correct Answer - final step in protein synthesis in which the new polypeptide and the components that carried out protein synthesis are separated from one another, occurs at a stop codon
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