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