WorksheetsAP Biology Unit 3 Review Quizizz
Total questions: 50
Worksheet time: 25mins
Where on an enzyme does the substrate bind?
active site
allosteric site
C-terminus
N-terminus
Describe the effect on the free energy of doubling the amount of enzyme.
double the free energy
half the free energy
triple the free energy
no effect on free energy
Which structure is unaffected by denaturation?
Primary
Secondary
Tertiary
Quaternary
Which environmental conditions can cause denaturation of the enzyme?
slight increase in temperature
extreme increase in temperature
decrease in temperature
extreme increase in temperature and pH changes
Which of the following will increase the rate of the reaction?
increase product
increase substrate
increase inhibitor
increase enzyme
Describe why an increase in temperature increases the rate of the reaction.
increase in temperature increases the speed/kinetic energy of particles
increase in temperature activates more enzyme to increase the rate
increase in temperature results in increase in substrate available
increase in temperature allows for a tighter fit in the active site
Describe the difference between competitive and noncompetitive inhibitors.
noncompetitive binds to active site and competitive binds to other site
competitive binds to active site and noncompetitive binds to other site
competitive is irreversible and noncompetitive is reversible binding
noncompetitive is irreversible and competitive is reversible binding
In order to maintain order and power cellular processes,
energy input must exceed energy loss
energy input equals energy loss
energy loss must exceed energy input
energy loss equals energy input
What is the process of an endergonic reaction being fueled by an exergonic reaction called?
second law of thermodynamics
energy coupling
first law of thermodynamics
endergonic/exergonic switch
Where did photosynthesis first evolve?
prokaryotic organisms
alien organisms
eukaryotic organisms
abiotic processes
What are the products of the light-dependent reactions of photosynthesis?
ATP & NADH
CO2 & H2O
NADPH & ATP
Organic Compounds & O2
What is the function of the electron transport chain between Photosystem II and Photosystem I?
establish electrochemical gradient of protons
to funnel electrons into photosystem I for the Calvin cycle
transport electrons to oxygen to make water
to synthesize ATP using ATP synthase
Where does the Calvin cycle take place?
thylakoid membrane
cristae
stroma
matrix
Where does the electron transport chain take place?
chloroplasts
prokaryotic plasma membrane
mitochondria
all of the choices
Which of the following are electron carriers for the electron transport chain in cellular respiration?
NADPH
FADH2
NADH
NADH & FADH2
Which process releases energy in glucose to form ATP, NADH, and pyruvate?
Glycolysis
Oxidative Phosphorylation
Krebs Cycle
Fermentation
What is oxidation?
loss of electrons
loss of water
gain of electrons
gain of water
In the electron transport chain of cellular respiration, where is the electrochemical gradient of protons generated?
cytosol
cristae
matrix
intermembrane space
Which process does NOT require oxygen?
Glycolysis
Oxidative Phosphorylation
Krebs Cycle
Aerobic respiration
Describe the pathway of electrons in the light reactions.
H2O → PSI → ETC → PSII → NADPH
H2O → PSII → ETC → PSI → NADPH
H2O → PSII → ETC → PSI → NADH
H2O → PSI → ETC → PSII → NADH
Enzymes ___________________ activation energy to speed up chemical reactions.
increase
decrease
What is the relationship between an enzymes active site and its substrate?
The active site has the right polarity to interact with the substrate.
The active site is hydrophobic and interacts with other hydrophobic amino acids on the substrate
The active site has a specific shape that fits the shape of the substrate
The active site uses energy to form covalent bonds with the substrate
How does a competitive inhibitor affect an enzymes function?
It binds to an allosteric site that alters the shape of the enzyme
It changes the polarity of the enzyme, decreasing the rate of reaction
It denatures the enzyme which increases the activation energy for the reaction.
It binds to the active site, preventing the enzyme from catalyzing the reaction
Which of these factors can affect the initial rate of an enzyme reaction?
Enzyme concentration
Substrate concentration
Temperature
pH
All of the above
What effect does high temperature have on most enzymes reaction rates?
High temperatures will speed up the enzyme's reaction rate
High temperatures will stabilize the enzyme's reaction rate
High temperatures will decrease enzyme reaction rates due to denaturation
High temperatures do not affect enzyme reaction rates
How does initial substrate concentration affect enzyme reaction rates?
High concentration of substrates will inhibit enzyme reaction rates
Low concentration of substrate will increase enzyme reaction rates
High initial concentrations of substrate will increase the enzyme reaction rate
Enzyme reaction rates are independent of substrate concentration
In scientific experiments what is a control?
The variable that is manipulated by the researcher
A test that does not have the independent variable, to show a baseline with no reaction
A test where the researcher does not know which sample contains which variable
The variable that changes based on the experimental conditions
What is chemiosmosis?
The diffusion of electrons through the electron transport chain
The breakdown of a glucose molecule
The diffusion of protons down their concentration gradient
The active transport of NADH into the mitochondria
Why is chemiosmosis important to cellular respiration?
It provides the energy needed to catabolize glucose
It is the force that powers ATP synthase
It provides the energy needed to breakdown pyruvate into carbon dioxide
It generates the electrons needed for the electron transport chain
Why is the hydrolysis of ATP important to a cells function?
It provides a source of phosphate for the cell.
It releases energy that can be used to power cellular processes
It absorbs excess hydrogen ions in the cell to regulate the internal pH
It acts as a catalyst for chemical reactions in the cell.
Why do plants not store 100% of the light energy absorbed by chlorophyll in glucose molecules?
Most of the energy is used to power the reaction or is lost as heat
Plants do not have a high energy requirement, so they do not need to convert 100% of the energy
The energy is used to power ATP synthase proteins on the thylakoid membrane
The remaining energy is used actively transport oxygen out of the cell.
What is the best reason that plants do not perform photosynthesis at night?
They close their stomata at night to rest
They do not have an energy source to power the light reactions
Only a few types of plants are nocturnal
There is less carbon dioxide released into the air at night
What are the net products of photosynthesis?
6 CO2, 6 H2O, Energy
6 O2 and 6 H2O
C6H12O6 and 6 O2
6 CO2 and C6H12O6
What factors affect the rate of photosynthesis?
CO2 concentration
H2O available
Temperature
Light intensity
All of the above
What powers the rotation of ATP synthase enzymes in mitochondria and chloroplasts?
The energy absorbed during the light reactions.
The electronegativity of oxygen
Energy released by breaking the chemical bonds in glucose
The diffusion of hydrogen
How does a plant obtain the carbon necessary to form glucose?
Through the light reactions
From stored sugars in the roots of the plant
From the catabolic breakdown of water
Through CO2 absorbed from the atmosphere
What products of the light reaction are directly needed by the Calvin cycle in photosynthesis?
H ions and carbon dioxide
Photons absorbed by chlorophyll
FADH2 and Oxygen
ATP and NADPH
Which phase of photosynthesis produces organic sugars?
The light reactions
The Calvin cycle
The link reaction
Electron transport chain
What are the products of the Krebs Cycle?
Pyruvate, water, ATP, NADH
Acetyl CoA, NADH
NADH, FADH2, carbon dioxide, ATP
ATP, glucose
What are the products of glycolysis?
Pyruvate, ATP, water, NADH
Carbon dioxide, FADH2, NADH, ATP
32 ATP
NADPH and ATP
What are the products of the light reaction of photosynthesis?
Oxygen, NADPH, ATP
Glucose, NADP, ADP
Carbon dioxide, water, ATP
Oxygen, FADH2, ATP
What process creates the proton motive force in cellular respiration?
The electron transport chain
The hydrolysis of ATP
Chemiosmosis
The Citric Acid cycle
What is the function of NAD in cellular respiration?
It catalyzes the conversion of glucose into ATP
It provides inorganic phosphate needed by ATP synthase
It acts as an electron and proton acceptor to carry energy to the electron transport chain
It is the coenzyme needed to convert glucose into pyruvate
How are the ATP synthase enzymes in photosynthesis and cellular respiration similar?
They both rely on chemiosmosis of hydrogens down a gradient to power phosphorylation
They are both located in the cytoplasm of the cell
They both use oxygen to create a concentration gradient
They both receive hydrogen ions from FADH2
When will lactic acid build up in animal cells?
When there is excess carbon dioxide
When the cells produce too much ATP
When there is not enough oxygen to fuel the mitochondria
When the cells need to remove excess oxygen to avoid damaging their components.
Based on this graph, which enzyme would function best in a basic environment?
A
B
The enzyme rubisco can
use carbon dioxide to make glucose
use oxygen to make glucose
use both gases to make glucose
none of the above
The light dependent reactions make the following products
ATP and NADH
ATP and NADPH
ATP and FADH2
all of the above
During the Calvin Cycle
ATP from the light dependent reactions is used to make glucose
NADH from the light dependent reaction is used to make glucose
1 ATP molecule is generated by one turn
extra ATP is used to regenrate CO2
Which is the final electron acceptor in aerobic cellular respiration?
Carbon Dioxide
Oxygen
Rubisco
Glucose
