GENERAL BIOLOGY 1/SECOND QUARTER SUMMATIVE TEST
Quiz by Daisy Velacruz
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- Q1
A scientist hydrolyzes ATP in a laboratory test tube. He finds that about 3 times as much as heat is released than when the same amount of ATP is hydrolyzed in a cell. Which of the following best explains the scientist’s observation?
ATP hydrolysis in a cell makes different products that in a test tube.
Cells are less efficient at producing heat.
Enzymes in cells use heat energy to catalyze reactions.
Cells often convert some of the energy from ATP hydrolysis into other usable forms.
300sSTEM_BIO11/12-IIa-j-1 - Q2
How is ATP hydrolysis used to power other cellular reactions?
It acts as an enzymatic catalyst.
It is coupled with an endergonic reaction.
It adds a phosphate to ADP.
It produces water which is used to power other reactions.
300sSTEM_BIO11/12-IIa-j-1 - Q3
In the reaction catalyzed by hexokinase, the two half reactions and their ΔG value are as follows: ATP + H2O --> ADP + Pi ΔG = -31kJ/mol
Pi + glucose --> glucose-6-P + H2O ΔG = +14kJ/mol The ΔG for the conversion of glucose to glucose-6-P with ATP as the phosphoryl donor is __________.
-45kJ/mol
-17kJ/mol
+17kJ/mol
+45kJ/mol
300sSTEM_BIO11/12-IIa-j-1 - Q4
An endergonic reaction can proceed only if it absorbs __________.
the same amount of free energy that is absorbed by the enzymatic breakdown
less free energy than is released by a coupled endergonic reaction
less free energy than is released by a coupled exergonic reaction
more free energy than is released by a coupled exergonic reaction
300sSTEM_BIO11/12-IIa-j-1 - Q5
What would you expect to happen if you compare the rate of photosynthesis in bright white light and in darkness?
The rate of photosynthesis will not be affected by bright white light or darkness.
The rate of photosynthesis will be greater in bright white light than in darkness.
The rate of photosynthesis will start slowly under bright white light, and then increase in darkness.
The rate of photosynthesis will be less under bright white light than in darkness.
300sSTEM_BIO11/12-IIa-j-3 - Q6
In paper chromatography, photosynthetic pigments from a plant pigment extract will separate due to their difference in__________.
molecular weight of the pigments
boiling point of the pigments
pH level of the pigments
solubility in a transport solution
300sSTEM_BIO11/12-IIa-j-3 - Q7
The color of a photopigment is due to the __________.
color of light that it reflects
color of the leaf
season of the year
color of light that it absorbs
300sSTEM_BIO11/12-IIa-j-3 - Q8
Based on a variety of experiments, it is known that the rate of photosynthesis is highest when wavelengths of light between 400 and 500 nm are used, and when wavelengths around 700 nm are used. What does this indicate about the relative importance of chlorophyll a and b in photosynthesis?
Reflection of light by chlorophyll a and b is essential for the process of photosynthesis.
The combined reflection of light by chlorophyll a and absorption of light by chlorophyll b are essential for the process of photosynthesis.
Transmission of light by chlorophyll a and b is essential for the process of photosynthesis.
Absorption of light by chlorophyll a and b is essential for the process of photosynthesis.
300sSTEM_BIO11/12-IIa-j-3 - Q9
Asa result of the cascade of electrons down the electron transport chains of the light reactions, __________.
NADP+ is oxidized to NADPH
NADP+ is reduced to NADPH
NADPH is oxidized to NADP+
NADPH is reduced to NADP+
300sSTEM_BIO11/12-IIa-j-4 - Q10
The electrons lost from the reaction center of photosystem I are replaced by electrons from __________.
ATP molecules
the top of the electron transport chain
the bottom of the electron transport chain
H2O molecules
300sSTEM_BIO11/12-IIa-j-4 - Q11
The electrons lost from the reaction center of photosystem II are replaced by electrons from __________.
the top of the electron transport chain
the bottom of the electron transport chain
ATP molecules
H2O molecules
300sSTEM_BIO11/12-IIa-j-4 - Q12
Photophosphorylation differs from oxidative phosphorylation in that __________.
energy is stored in the form of a proton concentration difference
the final electron acceptor is NADP+ and not oxygen
regeneration of ATP is driven by a flow of protons through an ATP synthase
it involves an electron transport chain
300sSTEM_BIO11/12-IIa-j-4 - Q13
Which of the following are produced during the Calvin cycle?
glucose, ADP, NADP+
ATP, NADPH, CO2
ATP, NADPH, O2
glucose, ADP, NADP+, CO2
300sSTEM_BIO11/12-IIa-j-5 - Q14
Carbon, in the form of CO2, must be taken from the atmosphere and attached to an existing organic molecule in the Calvin cycle. Therefore, the carbon is bound to the molecule. The products of the cycle only occur because of the added carbon. What are the products of the Calvin cycle and what is regenerated?
The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBisCO is regenerated.
The product of the Calvin cycle is a 3-PGA molecule and glyceraldehyde-3 phosphate is regenerated.
The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBP is regenerated.
The product of the Calvin cycle is glyceraldehyde-3 phosphate and oxygen is regenerated.
300sSTEM_BIO11/12-IIa-j-5 - Q15
What does RuBisC0 do?
Adds CO2 to RuBP in the carbon fixation stage
Regenerates RuBP with the aid of ATP
Combines electrons and H+ to reduce NADP+ to NADPH
Transfers electrons from NADPH to 1,3-biphosphoglycerate to produce G3P
300sSTEM_BIO11/12-IIa-j-5