exam 3-clicker Questions Flashcards
which of the following molecules has the greatest potential energy
nad+
NADH
ATP
fad
fadh
nadh
the need for fermenting cells to acquire more food than equivalent cells using cellular respiration?
glucose is not used in fermentation
since these organisms don’t take in oxygen, they don’t need much food
the energetic gain by fermentation is relativley small
they produce alcohol which gives them enough energy to power the cells
the energetic gain by fermentation is relatively small
isocitrate dehydrogenase is a key allosteric enzyme in the citic acid cycle. what affect do you think a high levle of NAD+ has on this enzyme?
enzymatic activity would increase
enzymatic activity would decrease
enzymatic activity would not change
enzymatic activity would increase
why does a plant absorb more wavelengths of light compared to an isolated chlorophyll molecule in the lab
because the plant produces accessory pigments
because an artifical light source is used in the lab
because in the plant the light is better focused on the chorophyll and thus the light has more energy
because the plant produces accessory pigments
the wavelenght of light emitted by fluorescnce is ___ the wavelnght of light absorbed by the fluorescing pigment
higher than
lower than
same as
higher than
most of the chlorophyll in the photosystmes is used
for redox reactions
to gather light
to oxidize water
to reduce water
gather light
if a plant was exposed to a toxin that made the thylakoid membranes permable to protons what would happen
the protons necessary to generate NADPH from NADP+ would no longer be present
the oxidation and reduction of the protein comlexes in the electron transport would be prevented
the proton gradient across the thylakoid membrane would be eliminated
a reversal of the proton gradient across the thylakoid membrane would result int hehgiher pH in the thylakoid lumen than in the surrounding stoma
the proton gradient across the thylakoid membrane would be eliminated
___ is the carbon input and ___ is the carbon output for the calvin cycle
rubisco;glucose
rubisco;triose phosphates
CO2; triose phosphates
CO2;triose phosphates
which best represents the relationship between cellular repiration and photosynthesis
photosynthesis stores energy in organic molecules,while respiration releases it
phtosynthesis stores energy in organic molecules, while photosynthesis releases it
respiration occurs only in animals and photosynthesis occurs in plants
phtosynthesis stores energy in organic molecules, while repiration releases it
an example of a ligand for a cytoplasmic receptor is
insulin
glucose
cortisol
coritsol
which type of receptor undergoes a conformational change upon activation
g protein coupled receptors
receptor protein kinases
ligand-gates ion channels
intracellular receptors
all of the above
all of the above
g proteins are active when they are bound to
adrenaline
gdp
atp
gtp
gtp
is the term g protein just a shorter name for a g protein coupled receptor
yes
no
no
you strip off proteins on the cells surface by using a protease. now when you add a specific signaling molecule, the cell still reponds. why
the signaling molecule doesn’t need a receptor
the signaling molecule is polar and can diffuse in
the receptor is in the interior of the cell
the receptor is in the interior of the cell
which components of the oathway is not a protein kinase
the receptor
ras
mek
mapk
ras
