Practice Test - Miniunit Delta II  23         1. (23) During  gene expression   genes will transcribe                 a specific mRNA which moves to the ribosome in the                 cytoplasm and acts acts as a template for a specific                 protein which may be coverted into an enzyme which                 will cause a specific reacion.                     a) true                 b) false    23-24      2. (23-24) Ultraviolet light may cause changes(mutations) in                 DNA molecules. If such a change was to occur in the                 gene portion of the DNA molecule, which of the following                 molecule(s) will be effected?                 a) mRNA               b) protein transcribed from RNA               c) both mRNA and protein transcribed               d) none of the above    25        3.  (25) Which of the is the correct sequence of events during the                expression of a gene?                  a) translation - transcription - protein - enzyme                b) enzyme -transcription - translation - protein                c) transcription - enzyme - translation -protein                d) translation - transcription - enzyme - protein                e) transcription - translation - protein - enzyme    26        4.  Which of the following lists the correct parts                of a DNA molecule?                a)  nucleotide bases(ACGT), sulfate, sugar(deoxyribose)              b)  sugar(ribose), nucleotide bases(AGCT), phosphate              c)  nucleotide bases(ACGU), phosphate, sugar(deoxyribose)              d)  sugar(ribose), phosphate, nucleotide bases (AGCT)              e)  phosphate,  sugar(deoxyribose), nucleotide bases (ACGT)    27        5.  Each type of amino acid (22) based on its R group is                attached to a specific tRNA in relation to its anticodon.                         a)  true            b) false    28        6.  An  average  protein consists of about  500  amino                acids.  Since it takes a triplet codon to specify                each amino acid in a protein, how many bases would                be found in gene for producing the average protein?                        a)  250              c)  1500                      b)  500              d)  1000    29        7.  Using the following abbreviations:                    G = guanine        C = cytosine                    A = adenine        T = thymine        Complete the double helix formed by this single strand of DNA:                             T C A G A T                             ------------               a)  G A T C C T                 d)  A G C T C A               b)  A G T C T A                 e)  C T G A G A               c)  A G U G U A      30       8.  After DNA replication two complete DNA               molecules are present, identical to each               other and to the original DNA molecule.                        a)  true             b) false    32       9.  In  which type of nucleic acid are the  four  bases                GCAU?                  a)  DNA     b)  RNA      c)  both DNA and RNA    32      10.  Which  type  of  nucleic acid  is  normally  single               stranded?                  a)  DNA     b)  RNA      c)  both DNA and RNA    33-34   11.  RNA that carries message from DNA to ribosome.                        a)  ribosomal RHA (rRNa)                      b)  messenger  RNA (mRNa)                      c)  transfer RNA  (tRNa))    33-34   12.  RNA that transfers amino acids to the ribosome.                       a)  ribosomal RNA (rRNa)                       b)  messenger  RNA (mRNa)                       c)  transfer RNA (tRNa)    34-37   13.  During protein synthesis  "A" is the copying of a code               from DNA to mRNA and "B" is the formation of a protein               as ordered by this code at the ribosome.                      "A"                  "B"                 a)  replication        transcription                 b)  translation        transcription                 c)  transcription      replication                 d)  transcription      translation    26      14.  Which of the following is not found in a DNA molecule?                        a)  adenine             d) thymine                      b)  guanine             e) ribose                      c)  phosphate    32      15.  Where is  mRNA transcribed?                        a)  from r RNA in the cytoplasm                      b)  from protein on the cell membrane                      c)  from DNA in the cell nucleus                      d)  all of the above                      e)  none of these    32      16.  The triplet  nucleic acid bases found on a tRNA               molecule  which match up to triplet bases located on mRNA.                        a)  codon             c) enzyme                      b)  anticodon         d) amino acid    32      17.   Which type of nucleic acid has the four bases GCAT:                   a)  DNA       b) RNA     c) both DNA and RNA    32      18.  Which  of  the  following is not  part  of  an  RNA                      molecule?                        a)  adenine          d) ribose                      b)  guanine          e) thymine                      c)  phosphate    27      19.  Enzymes consists of proteins which were              syhtesized specifically under the              direction of DNA transcribing a mRNA.                        a)  true          b) false    35      20.  A nucleotide triplet which is the mRNA code for a              particular amino acid is_____.                        a)  an anticodon                      b)  a codon                      c)  an enzyme                      d)  a polyribosome    34      21.  The RNA which makes up the ribosome is:                        a)  mRNA               c)  rRNA                      b)  tRNA               d)  aRNA Created by the Multimedia Development Lab, Academic Technology Services. Last modified October 29, 1997.