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Protein Synthesis
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The pathway of a tRNA during polypeptide elongation on the ribosome is
A site → P site → E site
A site → P site → entry site
P site → entry site → exit site
P site → A site → E site
A polysome could be best described as
an active site of lipid synthesis.
All of the above.
an active site of protein synthesis.
an active site of DNA synthesis.
Eukaryotic mRNA binding to the ribosomes is facilitated by __________
the 7-methyl guanosine cap
poly A tail
tRNA
the Shine Dalgarno sequence
Which of the following is not a necessary component of translation
mRNA
ligase
Anticodon
amino acid
The structure in a bacterium that indicates an active site for protein synthesis is
a polysome.
a chromosome.
a flagellum.
a cell membrane,
Which is required for protein synthesis
All of These
rRNA
tRNA
mRNA
The site of protein synthesis is
chromosome
endoplasmic reticulum
Ribosome
Nucleus
The site on a bacterial chromosome that marks the termination point for chromosome replication is called
ter
a stop codon.
a stem-loop
pau
Ribosomes select the correct tRNAs
solely on the basis of their anticodons
with the least abundant anticodons
then bind to the appropriate mRNA
depending on their abundance in the cytosol
Degenerated codon differs mostly in
both (b) and (c)
the identities of their second base
the wobble position
the identities of their third base
Processive synthesis is a characteristic feature of
all DNA polymerases.
DNA Pol III at a replication fork.
removal of RNA primers on Okasaki fragments.
DNA mismatch repair
Type I proteins (plasma membrane) have a
cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
multiple signal sequence and a hydrophobic stop transfer sequence
multiple signal sequence that doubles as the membrane anchoring sequence
cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence
The direction of amino acid transfer to the growing polypeptide chain is
from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
from the P site to the E site on the ribosome
from the P site to the A site on the ribosome
from the A site to the E (exit tRNA site) site on the ribosome
The anticodon of tRNA
binds to rRNA
binds to the Shine Dalgarno sequence
binds to an amino acid
binds to an mRNA codon
Which of the following RNAs bind to an amino acid
mRNA
tRNA
rRNA
hnRNA
Proteins contain __________ different amino acids, whereas DNA and RNA are composed of __________ different nucleotides
3,20
20,4
20,64
4,20
Which of the following has unusual bases
mRNA
tRNA
rRNA
hnRNA
Protein synthesis rates in prokaryotes are limited by the rate of mRNAsynthesis.
If RNA synthesis occurs at the rate of 50 nucleotides/sec, then rate of protein synthesis occurs at
10 amino acids/sec
17 amino acids/sec
50 amino acids/sec
25 amino acids/sec
The first step in translation is
binding of mRNA to the small ribosomal subunit
binding of mRNA to the two ribosomal subunits
binding of tRNA to the small ribosomal subunit
binding of the two ribosomal subunits to each other
Amino acids are joined together into a protein chain by which of the following
DNA polymerase
Messenger RNA
Transfer RNA
Hydrogen bonds
1
2
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Protein Synthesis