Quiz 5
Ch 5
Name________________________
Remote # ____________
1. Diffusion is the movement of
molecules from __________.
a. an area of higher concentration of
that type of molecule to an area of lower
concentration
b. an area of lower concentration of that
type of molecule to an area of higher
concentration
c. outside the cell to inside the cell
a. making the reaction endergonic
b. releasing energy for the reaction
c. lowering the activation energy of the
reaction
d. elevating the activation energy of the
reaction
5. A substance that is acted upon by an
enzyme to produce a product is called
a(n) __________.
a. allosteric inhibitor
b. coenzyme
c. substrate
d. electron carrier
2. Facilitated diffusion requires
__________.
a. a membrane transport protein
b. a concentration gradient
c. energy
d. a membrane transport protein and a
concentration gradient
6. Leaves include a number of structural
modifications for the purpose of
photosynthesis, including __________.
a. adjustable openings in the surface of
the leaf that permit the passage of
carbon dioxide, water, and oxygen
b. a waxy covering on the surface of the
leaf that is designed to reduce
evaporation
c. photosynthetic mitochondria
d. Both the first and second answers are
correct.
3. Two types of connections between
cells called "gap junctions" and
"plasmodesmata" are specialized to
__________.
a. prevent the movement of molecules
between cells that are tightly joined
along ribbons of cell membrane
b. tightly hold one cell against another at
focal points, almost like a spot weld of
superglue
c. permit the passage of substances
(e.g., ions) between cells through small
passageways that directly link the
cytoplasm of one cell to the cytoplasm
of another cell
d. None of these are correct.
7. During photosynthesis, electrons are
continuously lost from the reaction
center of photosystem II. What source is
used to replace these electrons?
a. sunlight
b. oxygen
c. water
d. carbon dioxide
4. Enzymes are a class of proteins that
catalyze chemical reactions in cells. Like
all other catalysts, they speed up
chemical reactions by __________.
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8. In the light-dependent reactions of
photosynthesis the difference in
hydrogen ion concentration across the
thylakoid membrane is used to generate
__________.
a. NADPH
b. glucose
c. FADH2
d. ATP
e. oxygen
9. The overall equation for glucose
metabolism is C6H12O6 + 6O2 --> 6CO2
+ 6H2O + ATP and heat. The carbon
atoms in the CO2 molecules in this
equation come from __________ during
reactions of __________.
a. O2, glycolysis
b. O2, the electron transport system
c. O2, the Krebs cycle
d. C6H112O6, glycolysis
e. C6H12O6, the Krebs cycle
10. How do cells recycle NADH back to
NAD+ during fermentation?
a. by converting pyruvate to lactic acid
b. by converting pyruvate to ethanol and
carbon dioxide
c. by converting pyruvate to acetyl CoA
d. The first two answers are correct.
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