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BCH Exam 1 questions with correct answers
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BCH Exam 1 questions with correct answers
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BCH Exam 1Which of the following statements are true regarding water? - correct answer ✔✔1. The boiling point of
water helps lower cellulose degradation.
2. water deactivates nucleophilic reactions.
3. Ionic hydrolysis is usually uncatalyzed, while covalent hydrolysis is usually enzyme-catalyzed.
4. Water began on land, prob desert.
5. Proton hopping is rapid proton transfer along a "wire"
How does hyperventilation affect pH? - correct answer ✔✔it decreases CO2 and H+ in the blood,
increasing pH.
how does hypoventilation affect pH? - correct answer ✔✔It lowers it by building up carbon dioxide in
the blood (which becomes H+, shifting bicarbonate buffer eq right)
strength of h bond is maximized when molecules are arranged in what shape? - correct answer ✔✔in a
linear fashion
HH equation - correct answer ✔✔pH = pKa + log [A-]/[HA]
What form of liquid is most common? Where can find the the rarer iteration? - correct answer ✔✔w5.
W1 is found when water reaches its bp, 100 centigrade.
Is water a base or an acid? - correct answer ✔✔Water can be both a proton donor or a proton acceptor
Average amount of h bonds in liq water and ice? - correct answer ✔✔3.4 h bonds in liq and 4 in ice.
What are some unique characteristics of water? - correct answer ✔✔High BP/ high viscosity relative to
its MW, strong ionic interactions, unique nonpolar interactions, low BP relative to earth's atmosphere.
, is the carbon cycle faster in cold climates or warm? Why? - correct answer ✔✔Cold climates bc ice
breaks open plants and releases co2.
What are the benefits of water's relative low BP? - correct answer ✔✔Evaporative heat loss, moist
atmosphere, keeps water mobile, and promotes erosion of the earth
What is the hydrologic cycle? What are the four mechanisms? - correct answer ✔✔The continuous
exchange of water on the earth.
Transpiration, precipitation, run off, and evaporation
pH is incredibly important in biochemistry: - correct answer ✔✔-many metabolites have acid or base
groups
-enzymes have acids and bases in active sites
-DNA and RNA are polyelectrolytes
What is the bicarbonate buffer system? - correct answer ✔✔CO2 + H2O <--> H2CO3 <--> HCO3- + H+
Are AAs in the L or D positions? - correct answer ✔✔L position.
What is thee abs of proteins at 1 mg/mL? - correct answer ✔✔280
Which of the following are true? - correct answer ✔✔Two cysteines can form a disulfide bridge.
Cysteine is a reduced compound
Cystine is mainly present in circulation.
SH groups are undissociated at physiologcal pH in cysteine.
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