Question 1
In a eukaryote, activating transcription factors may stimulate gene expression by binding to a DNA site called a(n) _________________.
A. histone
B. promoter
C. operon
D. silencer
E. enhancer
Question 2
Which of the following is true of gene regulation in both eukaryotes and prokaryotes?
A. Genes are organized into operons.
B. A cap and a tail are added to mRNA.
C. Transcription is the usual point at which gene expression is regulated.
D. Packing of DNA in chromosomes is elaborate.
E. Noncoding portions of RNA are removed in the making of mRNA.
Question 3
Nucleosomes are structures in the nucleus that are used to _______________.
A. wrap the DNA to organize it and it more compact
B. bind to and help process mRNA after it has been synthesized
C. synthesize ribosomes
D. plug the nuclear pores except when specifically recognized molecules pass through
E. do all of these
Question 4
The control of gene expression is more complex in multicellular eukaryotes than in prokaryotes because
A. eukaryotic cells are much smaller
B. prokaryotes are restricted to stable environments
C. the genes of eukaryotes provide information for making proteins
D. in a multicellular eukaryote, different cells are specialized for different functions
E. eukaryotic chromosomes have fewer nucleotides; therefore, each nucleotide sequence must do several jobs
Question 5
Gene duplication can ultimately give rise to all of the following EXCEPT _____________.
A. groups of genes with identical functions, but entirely unrelated sequences
B. pseudogenes
C. two closely related versions of a gene that are expressed in different tissues, or at different times during development
D. structurally related genes with entirely different functions
E. groups of identical genes that are expressed together
Question 6
In the human genome, oncogenes ________________.
A. promote cell adhesion
B. slow cell division
C. enhance DNA repair
D. stimulate cell division
E. suppress tumors
Question 7
Post-transcriptional controls _______________.
A. can affect mRNA stability
B. can include translational controls
C. can regulate mRNA splicing
D. may regulate the rate at which a molecule is translated
E. all of the above
Question 8
Multigene families arise as a result of ______________.
A. protein degradation
B. RNA splicing
C. transformation
D. the action of restriction enzymes
E. errors during DNA replication and recombination
Question 9
A cancer cell ______________.
A. requires less nutrients than a normal cell
B. is typically more than 10 times larger than a normal cell
C. does not respond to the chemical signals that control cell division
D. usually does not contain a nucleus
E. is correctly described by all of the above
Question 10
What do we call "jumping genes"?
A. exons
B. introns
C. operons
D. transposons
E. plasmids
Thank you in advance.
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