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University of Central Florida FIL 1000 Ch 9 Quiz 1)Deoxythymidylate (dT) is a: Select one: a

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University of Central Florida

FIL 1000

Ch 9 Quiz

1)Deoxythymidylate (dT) is a: Select one:

a.purine base

b.            pyrimidine base

c.             pyrimidine based nucleotide

d.            purine based nucleotide

e.            nucleoside

 

2.            Quaternary structure refers to the non-covalent interaction(s) between polymeric units, such as two or more monomer protein units that noncovalently interact. Which of the following scenarios for nucleic acids most closely resembles quaternary structure?

Select one:

a.            self-assembly of subunits in the tobacco mosaic virus

b.            interaction of DNA with proteins

c.             RNA and protein association in ribosomes d. All of these

e. None of these

 

3.            Supercoiling of DNA Select one:

a.            is not observed in prokaryotes

b.            requires the action of topoisomerase enzymes

c.             does not require ATP

d.            is not observed in eukaryotes

 

4.            The fundamental differences between RNA and DNA are Select one:

a.            the organic bases only

b.            bases, ribose units, and the phosphodiester linkage

c.             bases, ribose units, and the glycosidic bond type d. bases and the ribose units only

 

5.            What distinguishes nucleotides from nucleosides? Select one:

 

a.            Nucleosides lack the phosphate group.

b.            Nucleosides lack the sugar group.

c.             Nucleosides lack a nitrogenous base.

d.            The two words are synonymous

 

6.            Which of the following can be an epigenetic change to chromatin? Select one:

a.            methylation

b.            acetylation

c.             phosphorylation d. All of these

e. None of these

 

7.            Which of the following is the most common modification of nucleic acid bases? Select one:

a.            addition of a methyl group

b.            addition of a carboxylic acid

c.             addition of a fluorine

d.            reduction of a carbonyl to an alcohol

 

8.            Which of the following is the most distinguishing difference between a purine and a pyrymidine

Select one:

a.            purines are found in DNA while pyrimidines are found in RNA

b.            purines have nitrogens in the rings while pyrimidines do not

c.             pyrimidines have nitrogens in the rings while purines do not

d.            purines are found in RNA while pyrimidines are found in DNA

e.            purines are double ring structures while pyrimidines have a single ring

 

9.            Which of the following RNAs is the least abundant in a typical cell? Select one:

a.            mRNA

b.            rRNA

c.             snRNA

d.            tRNA

 

10.          Which piece of DNA will have the higher Tm, one with a cytosine plus guanine content of 30% or one with a cytosine plus guanine content of 50% if both are heated under the same experimental conditions?

Select one:

a. 30% cytosine plus guanine will have the higher Tm. b. 50% cytosine plus guanine will have the higher Tm.

c. Their Tm's will be the same.

d. There's no way to predict for this information.