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BCH 361 I Clicker EXAM PREP WITH COMPLETE SOLUTION
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BCH 361 I Clicker EXAM PREP WITHCOMPLETE SOLUTION
Which of the following types of atoms is abundant in human, sea water, and earth crust?
A. Hydrogen
B. Oxygen
C. Carbon
D. Nitrogen - =B. Oxygen
Which of the following is not a major type of bio molecules in human?
A. Carbohydrates
B. Fats
C. Nucleic Acids
D. Vitamins - =D. Vitamins
Which of the following cannot serve as a H-bond donor?
A. -NH3+
B. -OH
C. >C=O
D. >N-H - =C. >C=O
Hexane (apolar) and water (polar) do not mix. If phospholipids are added to a bi-phasic solution
of water/hexane, where would they end up?
A. Phospholipids will be in hexane only.
,B. Phospholipids will be in water only.
C. Phospholipid head groups will be in hexane and lipid tails will be in water.
D. Phospholipid head groups will be in water and lipid tails will be in hexane. - =D. Phospholipid
head groups will be in water and lipid tails will be in hexane.
Which weak bonding interactions does not require attractive Coulombic forces between the
bonded molecules?
A. Hydrogen bonds
B. Electrostatic interactions
C. Van der Waals interactions
D. Hydrophobic interactions - =D. Hydrophobic interactions
What kind of weak interactions can the two compounds (Adenine and Guanine) have with each
other?
A. Hydrogen bonding interactions
B. Electrostatic interactions
C. Van der Waals interactions
D. Hydrophobic interactions - =A. Hydrogen bonding interactions
The amino acid arginine has a guanidine functional group (see picture). Do you think guanidine
is an acid or a base?
A. Acid
B. Base
C. Neither - =B. Base
, What is the charge on the conjugate acid form of amine?
A. Positive
B. Negative
C. Neutral
D. It can be either - =A. Positive
Estimate the molar concentration of water in pure water from the acid dissociation constant of
water (10^-16 M) and the fact that [H+]=[OH-]=10^-7 M.
A. 1 M
B. 10 M
C. 100 M
D. 1000 M - =A. 1 M
Guanidine can adopt both base form and conjugateacid form. The pKa of side chain guanidine is
12.5.Which form is guanidine in at pH 7.4?
A. Base form
B. Conjugate acid form
C. Both are present at equal concentrations. - =B. Conjugate acid form
The titration curve of phosphoric acid is shown on the right. Which pH is not within the
buffering range of phosphoric acid and its conjugate bases?
A. 2.0
B. 4.0
C. 7.2
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