practice exam 1-2007-key

practice exam 1-2007-key - Practice Exam...

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Practice Exam Questions-BISC320-Fall 2004 1) When two atoms differing in electronegativity are joined in a covalent bond, then: a) the electrons are shared equally between the atoms b) the bond is nonpolar c) the atom with the greater electronegativity attracts the bonded electrons more d) a double bond is formed 2) At chemical equilibrium: a) all reactions have stopped b) all of the reactants have been consumed c) entropy equals enthalpy d) the forward reaction rate equals the reverse reaction rate 3) Why is the melting temperature (Tm, or denaturation temperature) for a double stranded DNA sequence of 40 base-pairs with 60% G:C content greater than for a double stranded DNA sequence of 40 base-pairs with 50% G:C content? a) guanines and cytosines remain solid at higher temperatures than adenine and thymine b) guanines and cytosines form very strong ionic bonds, adenine and thymine do not c) guanine and cytosine form three hydrogen bonds, adenine and thymine form only two d) the G:C content will equal the A:T content 4) Restriction enzymes: a) cleave DNA at any sequence b) cleave DNA at specific sequences c) restrict the activity of ligase d) none of the above 5) Which type of bond/interaction is most important in determining the secondary structure of proteins? a) hydrogen bond
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practice exam 1-2007-key - Practice Exam...

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