Criado por Blen Abate
mais de 4 anos atrás
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Questão | Responda |
tRNA activating enzymes | enzymes that attach a specific amino acid to the tRNA, using ATP for energy; this activates the amino acid |
What happens when the amino acid is attached? | it is activated by the formation of a bond between the enzyme and AMP, then it is covalently attached to the tRNA |
What happens to the energy from the bond between the amino acid and tRNA? | it is used to link the amino acid to the growing polypeptide during translation |
Initiation of translation | the first tRNA molecule is bound to the first codon (AUG) in the P site |
Elongation of translation | the ribosome moves the tRNA at the P site to the E site, the next codon binds at the vacant A site |
Termination of translation | a stop codon is reached, the free polypeptide is released |
Where does the protein go if it was made made by a free ribosome? | cytoplasm, mitochondria or chloroplasts |
Where does the protein go if it was made by ribosomes bound to the ER? | ER, Golgi apparatus, lysosomes, plasma membrane or outside the cell |
Why is there a delay between transcription and translation in eukaryotes? | because the transcript is modified several times before leaving the nucleus |
When does translation happen in prokaryotes? (in relation to transcription) | as soon as transcription ends, translation starts |
Polysomes | structures visible in an electron microscope that represent multiple ribosomes attached to a single mRNA molecule |
Primary structure | the sequence of amino acids in a polypeptide |
Secondary structure | the pattern of hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone |
Tertiary structure | interactions between: positively charged R-groups will interact with negatively charged R-groups, polar R-groups that form H bonds with other polar R-groups |
Quaternary structure | when polypeptides fit together when there's more than one chain it also refers to the addition of non-polypeptide components |
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