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Mbg 2040 Quiz 7 with 100- correct answers 2025
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Mbg 2040 Quiz 7 with 100- correct answers 2025
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Mbg 2040 Quiz 8 with 100%correct answers 2025
The enzymes which catalyzes the addition of an amino acid to the
appropriate tRNA molecule are: - answer Aminoacyl-tRNA synthetases
The 3 base pair sequence found on tRNAS which complement and pair with
the mRNA codon during translation is called the - answer anticodon
The prokaryotic ribosome consists of a 30S subunit and a 50S subunit
which assemble to form the complete 80S ribosome. - answer False
The eukaryotic ribosome consists of a 40S subunit and a 60S subunit
which assemble to form the complete 80S ribosome. - answer True
The Shine-Dalgarno sequence is recognized by which of the following? -
answer The rRNA molecule within the 30S subunit of the prokaryotic
ribosome
elF1, 2 and 3 are all examples of - answer Eukaryotic initiation factors
Put the following steps of translation initiation in prokaryotes in the
correct order: - answer 1. The 30S ribosomal subunit binds the mRNA
molecule at the Shine-Dalgarno sequence with the aid IF-3
2. IF-2/f-Met-tRNAfMET binds the mRNA/30S subunit complex with the
tRNA anticodon aligned with the initiation AUG codon on the mRNA. IF-1
and GTP simultaneously join, forming the 30S initiation complex.
3. IF-3 is released and the 50S subunit joins the initiation complex. GTP is
cleaved and the remaining initiation factors are released.
, 4. The 70S ribosomal is in position on the mRNA with f-Met-tRNAfMET base
paired with the initiation codon and in the P ribosomal site.
Put the following steps of polypeptide chain elongation in the correct
order: - answer 1. The appropriate incoming aminoacyl-tRNA bound with
EF-TU and one molecule of GTP binds the A site of the ribosome, with the
t-RNA anti-codon pairing with the mRNA codon at this site.
2. A peptide bond is formed between the carboxyl end of the growing
polypeptide chain and the amino group of the A site amino acid,
transferring the polypeptide to from the P site tRNA to the A site tRNA.
3. The peptidyl-tRNA moves from the A site to the P site while the
uncharged tRNA in the P site is translocated to the E site as the ribosome
moves 3 nucleotides down the mRNA.
4. This process is repeated until a STOP codon is present in the A site.
While there are many similarities between Prokaryotic and Eukaryotic
ribosome there are some notable differences. Match each statement below
with the appropriate label; Prokaryotes, Eukaryotes or Both. - answer 1.
Prokaryotes- The entire assembled ribosome consists of many ribosomal
proteins and 3 distinct rRNA molecules
2. Eukaryotes- The entire assembled ribosome consists of many ribosomal
proteins and 4 distinct rRNA molecules
3. Both- Two smaller subunits assemble to produce the complete ribosome
Given the following mammalian mRNA sequence what would be the
translated amino acid sequence?
5' cap - GUACCAGUGCCACCAUGGUCACUCCCCAUUAAGCUUUU-3' - answer
NH2-Met-Val-Thr-Pro-His-COOH
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