MOLECULAR GENETICS QUIZ

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1.  The monomers that nucleic acids are built from are _____ and  they contain not only atoms of C, H, O, and N but also ____.
a.  amino acids; sulfur                      b.  fatty acids; sulfur
c.  bases; phosphorus                     d.  nucleotides; phosphorus

2.  Wave lengths in the electromagnetic spectrum that are mutagenic are absorbed by
a.  DNA             b.  protein             c. both DNA and protein             d.  neither DNA nor protein

3.  Which of the following DNA base sequences is complementary to this base sequence:
                                                         ACGGATTAG
a.  TGCCTAATC    b.  GATTGCCGT    c.   UGCCUAAUC    d.  GAUUGCCGT

4.  Which of the following would represent a mutation?
a.  a change in the base sequence of DNA     b.  crossing over in meiosis
c.  both (a) and (b)                                                  d.  neither (a) nor (b)

5.  Arrange the following structures/chemicals in order of size from smallest to largest.
a.  codon    b. gene     c.  base    d.  chromosome     _____,_____,______,_____

6.  A change in which of the following would result in a mutation?
a.  order of bases in DNA        b. gene             c.  chromosome        d.  all of the above 

7.  It is possible to insert the DNA from one virus (virus A) into the protein coat of a different virus (virus B). If such a composite virus infected a cell, the resultant viruses produced in the host cell would have DNA like virus ____ and protein like ______.
a.  A;B                b.   A;A                 c.  B;B                  d.  B;A

8.  The production of a protein from mRNA is called ______.
a.  replication         b.   transformation        c.  transcription         d.  translation

9.  A sequence of bases is found in some type of nucleic acid.  The sequence is  AUUCCG.  The nucleic acid in question must be
a.  DNA              b.  mRNA             c.  tRNA              d.  It could be either mRNA or tRNA

10.  In eukaryotic cells, DNA replication takes place in the ______ and protein synthesis takes place in the ________.
a.  nucleus; cytoplasm                             b.  cytoplasm; nucleus
c.  both take place in the nucleus          d.  both take place in the cytoplasm

11.  Which of the following does NOT occur in DNA replication?  The original double helix
a.  unwinds                                                                 b.  bonds between base pairs are broken
c.  the unpaired strands split into codons          d.  all occur

12.  Some point mutations are called silent mutations, i.e., the mutation does not change the amino acid after the altered mRNA is translated.  This is possible because the genetic code is
a.  universal                                                                       b.   degenerate
c.  both (a) and (b) are possible explanations          d.  neither (a) nor (b) are possible explanations

13.  If the arrangement of bases on DNA is CATTAG, then a corresponding strand of mRNA will be
a. GTAATC        b. TGCCGA         c. GUAAUC         d. UGCCGA

14. The chemical instructions in DNA are due to
a. the way the bases are paired                                                             b. the order of the bases in DNA
c. the arrangement of the sugar and phosphate molecules         d. the codons in mRNA

15. The role of mRNA is to
a. carry the genetic instructions to the cytoplasm.
b. identify and transport amino acids.
c. provide nucleotides for RNA production.
d. produce amino acids for protein.

16. Transcription refers to
a. DNA replication.
b. protein synthesis using mRNA and tRNA.
c. mRNA synthesis from DNA.
d. converting an inactive protein into its active form.

17. Which of the following molecules has an amino acid attached to it?
a. DNA            b. tRNA         c. mRNA         d. all of the above

18. Codons may
a. act as start codons.
b. act as stop codons.
c. code for a specific amino acid.
d. do all of the above.

19. When a DNA molecule replicates, the resulting DNA molecules are correctly described by which of the following?
a. Entirely new strands of DNA are made.
b. Each strand of the DNA molecule contains some old DNA and some new DNA.
c. Each new DNA molecule contains one old strand and one new strand.
d. One DNA molecule contains two old strands; the other has two new strands.

20. How many amino acids are coded for in this mRNA sequence:      GGUACCUUUACU
a. 12        b. 6         c. 4         d. 1

21. Thirty percent of the bases in DNA extracted from a prokaryotic cell is adenine. What percentage of cytosine is present in this DNA?
a. 10        b. 20         c. 30         d. 40

22. All cells of a species (except for the sex cells ) contain the same amount of DNA. However, the cells of multicellular organisms vary in both structure and function from one tissue type to another. This specialization is evidence that most of the DNA in a cell is
a. inactive                                    b. removed as the cell matures
c. converted into protein         d. converted into glycoprotein

23. Which of the following is the role of the structural genes in an inducible enzyme system?
a. to code for proteins that metabolize an inducer substance
b. to produce a repressor that binds to the operator
c. to stop the transcription of the operator
d. to recognize and form a complex with the inducible enzyme

24. Substances that cause cells to increase production of an enzyme (or group of enzymes ) are know as
a. introns        b. repressors        c. inducers        d. promoters

25. An operon is most closely associated with
a. DNA replication         b. point mutations         c. translation         d. transcription

 

 

 

 

 

 

 

 

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00