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Pre Test Quiz
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1
A promoter is, by definition,
A)an off switch for transcription.
B)a short portion of DNA where an active repressor binds.
C)a gene which binds to an operator to turn genes on.
D)a short sequence of DNA where RNA polymerase first attaches when genes are to be transcribed.
2
An operator, which is a component of the operon model, is defined as
A)a short portion of DNA where an active repressor binds, which blocks transcription.
B)a gene located outside the operon that codes for DNA-binding protein.
C)a short sequence of DNA that binds RNA polymerase when genes are to be transcribed.
D)a short portion of DNA where an active repressor binds, which initiates transcription.
3
Chromatin that is wound around a core of eight histones is called __________. Areas of highly condensed chromatin are called __________.
A)euchromatin and it is not transcribed; heterochromatin and are transcribed
B)heterochromatic and it is transcribed; euchromatin and are not transcribed
C)euchromatin and it is transcribed; heterochromatin and are not transcribed
D)heterochromatin and it is not transcribed; euchromatin and are transcribed
4
Noncoding DNA was previously believed to be “junk”. Now, we are beginning to better understand its use in forming __________ that function in regulating gene expression.
A)miRNAs
B)All of these are correct answers.
C)siRNAs
D)small RNAs
5
Two types of genes ordinarily keep the cell cycle functioning as it should. Which choice correctly explains the role of each these genes in this process?
A)Proto-oncogenes are turned on when cells are normal. Tumor suppressor genes are turned on when cells are cancerous and need to be killed.
B)Tumor suppressor genes promote the cell cycle and inhibit apoptosis. Proto-oncogenes inhibit the cell cycle and promote apoptosis.
C)Proto-oncogenes promote the cell cycle and inhibit apoptosis. Tumor suppressor genes inhibit the cell cycle and promote apoptosis.
D)Tumor suppressor genes are turned on when cells are normal. Proto-oncogenes are turned on when cells are cancerous and need to be killed.





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