Life: The Science of Biology

Purves, William K., Sadava, David E., Orians, Gordon H., Heller, H. Craig

Chapter 14

The Eukaryotic Genome and Its Expression - all with Video Answers

Educators

Chapter Questions

Problem 1

Eukaryotic protein-coding genes differ from their prokaryotic counterparts in that only eukaryotic genes
$a$ are double-stranded.
$b$. are present in only a single copy.
$c .$ contain introns.
d. have a promoter.
$e .$ transcribe mRNA.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 2

Comparison of the genomes of yeast and bacteria shows that only yeast has many genes for
a. energy metabolism.
$b$. cell wall synthesis.
$c .$ intracellular protein targeting.
d. DNA binding proteins.
$e .$ RNA polymerase.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 3

The genomes of a fruit fly and nematode work are similar to that of yeast, except that the former have many genes for
$a$. intercellular signaling.
$b .$ synthesis of polysaccharides.
$c .$ cell cycle regulation.
$d$. intracellular protein targeting.
$e .$ transposable elements.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 4

Which of the following does not occur after mRNA is transcribed?
$a$ binding of RNA polymerase II to the promoter
$b$. capping of the 5 ' end
$c .$ addition of a poly A tail to the $3^{\prime}$ end
$d .$ splicing out of the introns
$e .$ transport to the cytosol

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 5

Which statement about RNA splicing is not true?
a. It removes introns.
$b$. It is performed by small nuclear ribonucleoprotein particles (snRNPs)
$c .$ It always removes the same introns.
$d$. It is usually directed by consensus sequences.
$e .$ It shortens the RNA molecule.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 6

Eukaryotic transposons
a. always use RNA for replication.
$b$. are approximately 50 bp long.
$c$. are made up of either DNA or RNA.
$d$. do not contain genes coding for transposition.
$e .$ make up about half of the human genome.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 7

Which statement about selective gene transcription in eukaryotes is not true?
a. Different classes of RNA polymerase transcribe different parts of the genome.
$b$. Transcription requires transcription factors.
$c .$ Genes are transcribed in groups called operons.
$d .$ Both positive and negative regulation occur
$e .$ Many proteins bind at the promoter.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 8

Heterochromatin
a. contains more DNA than does euchromatin.
$b$, is transcriptionally inactive.
$c .$ is responsible for all negative transcriptional control.
$d$ clumps the $X$ chromosome in human males.
$e .$ occurs only during mitosis.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 9

Translational control
$a$. is not observed in eukaryotes.
$b$. is a slower form of regulation than transcriptional control.
$c .$ can be achieved by only one mechanism.
$d$. requires that mRNA be uncapped.
$e .$ ensures that heme synthesis equals globin synthesis.

Christina Sorrentino

Christina Sorrentino

Numerade Educator

Problem 10

Control of gene expression in eukaryotes includes all of the following except
$a$. alternative splicing of RNA transcripts.
$b$. binding of proteins to DNA.
$c .$ transcription factors.
$d$. feedback inhibition of enzyme activity by allosteric control.
$e .$ DNA methylation.

Christina Sorrentino

Christina Sorrentino

Numerade Educator