Quiz 11 2006 key - Quiz 11 Key Fall 2006 Bio 181 Sections 7...

Quiz 11 Key, Fall 2006 Bio 181, Sections 7, 8H
mRNA is synthesized in the _______ direction, which corresponds to the _______ of the
protein.
a. 5′ to 3′; N terminus to C terminus
b. 3′ to 5′; C terminus to N terminus
c. 5′ to 3′; C terminus to N terminus
d. 3′ to 5′; N terminus to C terminus
e. Examples of all of the above have been found.
Answer: a
In protein synthesis, the endoplasmic reticulum
a. is the site where mRNA attaches.
b. is the site where all ribosomes bind.
c. is the site of translation of membrane-bound and exported proteins.
d. produces tRNAs.
e. brings together mRNA and tRNA.
Answer: c
Mutations are
a. heritable changes in the sequence of DNA bases that produce an observable phenotype.
b. heritable changes in the sequence of DNA bases.
c. mistakes in the incorporation of amino acids into proteins.
d. heritable changes in the mRNA of an organism.
e. None of the above
Answer: b
The type of mutation that stops translation of a protein is a(n)
a. missense mutation.
b. nonsense mutation.
c. frame-shift mutation.
d. aberration.
e. None of the above
Answer: b
In eukaryotes, ribosomes become associated with endoplasmic reticulum membranes
when
a. a signal sequence on the mRNA interacts with a receptor protein on the membrane.
b. a signal sequence on the ribosome interacts with a receptor protein on the membrane.
c. a signal sequence at the amino terminus of the protein being synthesized interacts
with a receptor protein on the ribosome.
d. a signal sequence on the protein being synthesized interacts with a membrane
attachment site on the ribosome.
e. the messenger RNA passes through a pore in the membrane.
Answer: d

During translation initiation, the first site occupied by a charged tRNA is the
a. A site.