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Bio MCI: Page 2
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<strong>Biology MCI:</strong> Page 2
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<body class="question">
<p class="question">
7. Proteins are made from
</p>
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<html>four different kinds of monomers called nucleotides.</html>
<html>four different kinds of monomers called amino acids.</html>
<html>twenty different kinds of monomers called nucleotides.</html>
<html>twenty different kinds of monomers called amino acids.</html>
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<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<body class="question">
<p class="question">
8. The diagrams below show pairings of nucleotide bases.<br><br>
</p>
<center>
<font color="red"><img src="Nucleotide_pairings.png" height="230" width="650">
<br>
</font>
</center>
<br>
Which nucleotide pair has the strongest attraction and why?
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<html>A-C because they are similar in structure</html>
<html>G-T because they are different in structure</html>
<html>G-C because multiple hydrogen bonds are formed</HTML>
<html>A-T because multiple hydrogen bonds are formed</html>
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<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<p class="question">
9. Several mRNA molecules are made from a single gene.<br><br>These mRNAs
</p>
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<html>are precise copies of the DNA.</html>
<html>contain the code for many proteins.</html>
<html>have the same sequence of A, U, G, and C bases.</html>
<html>will turn into proteins when they encounter a ribosome.</html>
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<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<body class="question">
<p class="question">
10. How many nucleotides are needed to code for a protein with 30 amino
acids?
</p>
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<html> 10</html>
<html> 60</html>
<html> 90</html>
<html>120</html>
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<body class="question">
<p class="question">
11. There are four nucleotide bases in DNA (A, T, G, and C). Each DNA
triplet in a gene (such as AGT or CCG) codes for an amino acid. There
are 64 different combinations of DNA triplets possible, but there are
only 20 different amino acids used in organisms.<br><br>Which statement
is the best explanation of why there are more triplets than amino acids?
</p>
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<html>Most of the DNA triplets don't code for any amino acids.</html>
<html>Some amino acids are coded for by more than one triplet.</html>
<html>A single mutation in the DNA leads directly to protein malfunction.</html>
<html>There are more amino acids possible but they are not used by many organisms.</html>
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<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<body class="question">
<p class="question">
12. A deletion mutation in DNA (removal of a single base) will result in
a protein with
</p>
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<html>a single incorrect amino acid.</html>
<html>incorrect amino acids scattered throughout.</html>
<html>the correct sequence up to a certain point and then an incorrect sequence thereafter.</html>
<html>several incorrect amino acids in a row and some incorrect ones scattered throughout.</html>
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<body class="question">
<p class="question">
13. A silent mutation in a gene has no effect on the amino acid sequence
of the protein produced by the gene.<br><br>Why?
</p>
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<html>The gene doesn't get translated.</html>
<html>A deletion mutation is balanced by an insertion mutation.</html>
<html>Proteins can repair themselves by replacing an amino acid.</html>
<html>The genetic code has more than one codon for each amino acid.</html>
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BioMCI_14
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<head>
<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<body class="question">
<p class="question">
14. Which statement about the primary structure of a protein is NOT true?
</p>
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<html>It may be branched.</html>
<html>It is the sequence of amino acids in the protein.</html>
<html>It is determined by the sequence of the corresponding DNA.<html>
<html>It determines the three-dimensional structure of the protein.</html>
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<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<body class="question">
<p class="question">
15. Which is NOT a common secondary structure for proteins?
</p>
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<html>loop</html>
<html>beta sheet</html>
<html>alpha helix</html>
<html>double helix</html>
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<p class="question">
16. Why is a hydrophobic (non-polar) core formed when a protein folds in
water?
</p>
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<html>Water repels non-polar amino acid side chains.</html>
<html>The polar amino acid side chains repel the non-polar side chains.</html>
<html>Water is more attracted to polar than to non-polar amino acid side chains.</html>
<html>The non-polar amino acid side chains are more attracted to water than to the polar side chains.</html>
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<p class="firstp">
In the model on the right, each amino acid in a protein chain is shown
as a bead. The color of each bead corresponds to the polarity of its
side chain:<br>
</p>
<p>
<img src="aaBeads3D.gif">
</p>
<p>
<strong><font color="red">Press run before answering the question below.</font></strong>
</p>
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<p class="question">
17. Press <b>Run</b> on the model above to see how this short protein
chain folds into its final shape.<br><br>Which amino acid substitution
is most likely to change the way this protein folds?
</p>
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<html>replacing amino acid A with a hydrophilic amino acid</html>
<html>replacing amino acid B with a hydrophilic amino acid</html>
<html>replacing amino acid A with another type of hydrophobic amino acid<html>
<html>replacing amino acid B with another type of hydrophobic amino acid</html>
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