BIL150 GAINES FINAL REVIEW TEST 2
QUESTIONS WITH 100% CORRECT
ANSWERS
\.You are investigating an abnormal eukaryotic cell line that makes all of its mRNAs
much longer than the mRNAs from normal cells. Intrigued, you examine the
proteins in these abnormal cells and note that many of them are either much
longer or much shorter than the normal proteins from non mutant cells. Assuming
there is just one mutant defect in these cells, what is that defect? - ANSWERS-the
spliceosome is nonfunctional
\.There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is
best explained by the fact that - ANSWERS-the rules for base pairing between the
third base of a codon and tRNA are flexible
\.What is true of astrocytes? - ANSWERS-they provide structural support for the
neuron, they are a specific type of glial cell and they contribute to the blood-brain
barrier
\.two potential devices that eukaryotic cells use to regulate transcription are -
ANSWERS-DNA methylation and histone modification
\.One of the DNA replication proteins/enzymes is altered in a way that results in
an increased rate of single base changes in the newly synthesized DNA strand.
, Which function is most likely to be disrupted? - ANSWERS-the proofreading
function of DNA polymerase II
\.The lagging strand is the daughter strand that has its ____ en pointed toward the
replication fork and is therefore synthesized______. - ANSWERS-5'; in a series of
segments
\.dMismatch repair and nucleotide excision repair of DNA are similar in that: -
ANSWERS-each uses an undamaged segment of DNA as the template to repair a
damaged segment of DNA
\.Is the formation of a peptide bond spontaneous? - ANSWERS-not spontaneous,
requires energy input
\.A bacterium is infected with an experimentally oncstuced bacteriophage
composed of the T2 phage protein coat and T4 phage DNA. The new phages
produced would have ____. - ANSWERS-T4 protein and T4 DNA
\.What even immediately precedes the nerve firing an action potential? -
ANSWERS-the threshold potential is reached
\.Which aspect of normal lac operon function is an example of post-translational
control? - ANSWERS-interaction of lactose with the repressor
\.In eukaryotes, the normal or default state is that genes are turned _____. -
ANSWERS-off through their association in nucleosomes
QUESTIONS WITH 100% CORRECT
ANSWERS
\.You are investigating an abnormal eukaryotic cell line that makes all of its mRNAs
much longer than the mRNAs from normal cells. Intrigued, you examine the
proteins in these abnormal cells and note that many of them are either much
longer or much shorter than the normal proteins from non mutant cells. Assuming
there is just one mutant defect in these cells, what is that defect? - ANSWERS-the
spliceosome is nonfunctional
\.There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is
best explained by the fact that - ANSWERS-the rules for base pairing between the
third base of a codon and tRNA are flexible
\.What is true of astrocytes? - ANSWERS-they provide structural support for the
neuron, they are a specific type of glial cell and they contribute to the blood-brain
barrier
\.two potential devices that eukaryotic cells use to regulate transcription are -
ANSWERS-DNA methylation and histone modification
\.One of the DNA replication proteins/enzymes is altered in a way that results in
an increased rate of single base changes in the newly synthesized DNA strand.
, Which function is most likely to be disrupted? - ANSWERS-the proofreading
function of DNA polymerase II
\.The lagging strand is the daughter strand that has its ____ en pointed toward the
replication fork and is therefore synthesized______. - ANSWERS-5'; in a series of
segments
\.dMismatch repair and nucleotide excision repair of DNA are similar in that: -
ANSWERS-each uses an undamaged segment of DNA as the template to repair a
damaged segment of DNA
\.Is the formation of a peptide bond spontaneous? - ANSWERS-not spontaneous,
requires energy input
\.A bacterium is infected with an experimentally oncstuced bacteriophage
composed of the T2 phage protein coat and T4 phage DNA. The new phages
produced would have ____. - ANSWERS-T4 protein and T4 DNA
\.What even immediately precedes the nerve firing an action potential? -
ANSWERS-the threshold potential is reached
\.Which aspect of normal lac operon function is an example of post-translational
control? - ANSWERS-interaction of lactose with the repressor
\.In eukaryotes, the normal or default state is that genes are turned _____. -
ANSWERS-off through their association in nucleosomes
