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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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  • October 12, 2024
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Sakayobako30
BCH Exam 1

Which 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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