Title: Practice Test
Author: justin lovrien
Last saved by: lovrienj

Practice Test for DNA Test

1.  How does the lactose repressor block transcription of the lactose operon?
a. | by "turning off" the appropriate genes in the intron
b. | by regulating the activity of the enzymes that the operon codes for
c. | by binding allosterically to the appropriate genes
d. | by slowing the uptake of lactose into the cell
e. | by binding to the operator

2.  Nucleic acid contains
a. | sulfur.
b. | phosphorus.
c. | potassium.
d. | iron.
e. | manganese.

3.  If the DNA triplets were ATG-CGT, the mRNA codons would be
a. | AUG-CGU.
b. | ATG-CGT.
c. | UAC-GCA.
d. | UAG-CGU.
e. | none of these

4.  If the DNA triplets were ATG-CGT, the tRNA anticodons would be
a. | AUG-CGU.
b. | ATG-CGT.
c. | UAC-GCA.
d. | UAG-CGU.
e. | none of these

5.  A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)
a. | codon.
b. | intron.
c. | messenger.
d. | gene.
e. | enzyme.

6.  Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of adenine and 

a. | Avery
b. | Griffith
c. | Chargaff
d. | Hershey and Chase
e. | Pauling

7.  Eukaryotic DNA molecules
a. | have no proteins.
b. | have small amounts of protein at each end of the DNA molecules.
c. | have large amounts of protein at each end of the DNA molecules.
d. | have small amounts of protein dispersed among the DNA molecules.
e. | have large amounts of protein dispersed among the DNA molecules.

  8.  	A TATA box is seen in __________ cells and is the site where __________.
a. | bacterial; RNA polymerase binds
b. | eukaryotic; DNA ligase cleaves introns
c. | eukaryotic; RNA polymerase binds
d. | both bacterial and eukaryotic; transcription factors bind
e. | bacterial; a repressor protein binds

   9.  .	Splicing together DNA from 2 different organisms is called:
a. | bioengineering.
b. | in vitro gene technology.
c. | biotechnology.
d. | recombinant DNA technology.
e. | genetic engineering.

10.  The experiments of which of the following researchers clearly distinguished DNA as the hereditary material (as opposed to protein)?
a. | Pauling
b. | Hershey and Chase
c. | Griffith
d. | Watson and Crick
e. | Avery

11.	  The building blocks of nucleic acids are
a. | amino acids.
b. | nucleotides.
c. | pentose sugars.
d. | phosphate groups.
e. | nitrogenous bases.

	12.  Which of the following statements is true?
a. | The hydrogen bonding of cytosine to guanine is an example of complementary base pairing.
b. | Adenine always pairs up with guanine in DNA, and cytosine always teams up with thymine.
c. | Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base.
d. | When adenine base pairs with thymine, they are linked by three hydrogen bonds.
e. | In the DNA of all species, the amount of purines never equals the amount of pyrimidines.

13.  The synthesis of an RNA molecule from a DNA template strand is
a. | replication.
b. | translation.
c. | transcription.
d. | DNA synthesis.
e. | metabolism.

14.  Frameshift mutations may involve
a. | substitution of nucleotides.
b. | substitution of codons.
c. | substitution of amino acids.
d. | addition or deletion of one to several base pairs.
e. | all of these

15.  Which of the following carries amino acids to ribosomes, where amino acids are linked into the primary structure of a polypeptide?
a. | mRNA
b. | tRNA
c. | hnRNA
d. | rRNA
e. | all of these
 
16.  	"Sticky ends" are:
a. | the single-stranded ends of a DNA segment created by some restriction enzymes.
b. | a problem in recombinant DNA technology because they form loops of single-stranded DNA.
c. | double-stranded ends of a DNA segment created by some restriction enzymes.
d. | sites of the origin of replication in prokaryotes.
e. | sugar molecules that are bound to the ends of a DNA fragment.

Answer Key:
1.e;  2.b;  3.c;  4.a;  5.d;  6.c;  7.e;  8.c;  9.d;  10.b;  11.b;  12.a;  13.c;  14.d; 15.b; 16. a