cell bio review chapter 7

which of the following pairs of codons are likely to be involved in the theory of the wobble

-AGU and AGA -a false answer would be UAA and UAG bc they are STOP codons!!! -wobble differs in the third letter

of the following steps associated with translation, which does not involve hydrolysis of GTP?: -translocation of ribosome -formation of the initiation complex -aminoacylation of tRNA

aminoacylation of tRNA

which of the following statements about translation is true?

the ribosome moved down the mRNA in the 5' to 3' direction and the synthesized protein in the direction of amino terminus to carboxy terminus

following mRNA sequence of a protein would encode how many amino acids (assuming translation begins at the AUG at the very start) 5'- AUGGGAUCCGACCUCAAGGTAUAA -3'

7, bc you include the AUG start codon and then you do NOT include the stop codon UAA

the ribosome is important for catalyzing the formation of peptide bonds. which of the following statements is true? -once the larger and small subunits of the ribosomes assemble, they will not separate from each other -catalytic site for peptide bond formation is formed primarily from an rRNA

catalytic site for peptide bond formation is formed primarily from an rRNA

genetic code has 64 codons, of which 61 codons for amino acids. there are only 20 amino acids. thus some amino acids are encoded for by more than one codon. this observation led to the genetic code being referred to as...

degenerate or redundant

which of the following statements about the genetic code is correct: -all codons specify more than one codon -all codons specify an amino acid -all amino acids are specified by more than one codon -the genetic code is redundant

the genetic code is redundant

what is responsible for covalently linking amino acids to the 3' end

aminoacyl-tRNA synthetase

the piece of RNA below includes the region that codes for the binding site for the initiator tRNA needed in translation: GUUUCCCGUAUACAUGCGUCC...

-CGU is Arginine -find AUG as the start codon and the next three letters after that are what we are looking for -use the genetic code chart

which of the following nucleotides in anticodons can allow for wobble in translation: -cytosine -adenine -thymine -inosine

-inosine

which amino acid would you expect a tRNA with the anticodon 5' - CUU - 3' to carry?

-read 3' to 5' bc it's an anticodon so 3'- UUC -5' -complement is AAG -AAG is Lysine

with the exception of the initiator, Met-tRNA all other tRNAs must pass through the three sites of the ribosomes in a specific order. what is the order?

A to P to E site

a tRNA has an anticodon with the sequence 3'- CAU - 5' what is the sequence of the complementary codon assuming the standard conventions for writing codons and anticodons

GUA

the codon for phenylalanine is UUU. which of the following codons also most likely codes for phenylalanine

UUC -if the first two letters are the same, it's more than likely a wobble so it will encode for the same amino acid