WorksheetsCh4 Cells and Energy
Total questions: 61
Worksheet time: 31mins
Which of the following statements is true for all cells?
They use solar energy.
They use photosynthesis.
They use chemical energy.
They use chemosynthesis.
Which phrase best describes the function of the ATP molecule?
stores energy
carries energy
absorbs energy
converts energy
Where does the chemical energy to produce ATP come from?
the conversion of ATP to ADP
the use of chemicals from the environment to build sugars
the addition of a phosphate group to ATP
the breakdown of carbon-based molecules into smaller molecules
Energy is released from an ATP molecule for cellular processes when it
has a phosphate group removed.
stores an extra phosphate group.
converts a phosphate group to ADP.
produces a sugar molecule.
Which of the following is the source of energy used in chemosynthesis?
sunlight
heat from hydrothermal vents
chemical compounds
amino acids
Which of the following statements best describes the process of photosynthesis?
Plants use oxygen to make simple sugars.
Chlorophyll builds sugars in the thylakoid membrane.
Light breaks down water molecules and releases carbon dioxide.
Chloroplasts absorb sunlight and store chemical energy.
What is the term for an organism that makes its own source of chemical energy?
decomposer
producer
chloroplast
protist
The main light-absorbing molecules found in plant leaves are called
chloroplasts
thylakoids
chlorophyll
grana
The function of the light-dependent reactions is to
build sugars
capture and transfer energy
release carbon dioxide
form water molecules
The light-independent reactions of photosynthesis need
carbon dioxide
oxygen
water
cellulose
Which of the following takes place in the light-dependent reactions of photosynthesis?
Sugars are made
Energy is captured
Chlorophyll is pumped
CO2 is formed
Where do the hydrogen ions for the photosystems of the
light-dependent reactions come from?
sugars
sunlight
acids
water
Which phrase best describes the electron transport chain in photosynthesis?
a chain of photosynthetic proteins located in the stroma
a collection of enzymes used to make ADP
a series of proteins located in the thylakoid membrane
a group of enzymes that carries energy to the Calvin cycle
In the light-independent reactions of photosynthesis,
CO2 enters the Calvin cycle and sugars are made.
H2O is broken down and oxygen is released.
NADPH is produced and transferred to photosystem I.
electrons are energized and used to pump H+ ions.
What is the relationship between the photosystems and the Calvin cycle?
The photosystems produce ATP synthase for the Calvin cycle.
The photosystems transfer hydrogen ions and carbon dioxide to the Calvin cycle.
The photosystems transfer energy to the Calvin cycle through ATP and NADPH.
The photosystems build sugars with the carbon dioxide produced by the Calvin cycle.
Which of the following types of organisms uses cellular respiration for their cellular energy needs?
eukaryotes
plants only
animals only
prokaryotes
Which process breaks down sugars to make ATP when oxygen is present?
anaerobic respiration
cellular respiration
glycolysis
photosynthesis
The part of cellular respiration in which glucose is broken down is called
photosynthesis
aerobic respiration
electron transport
glycolysis
Two products of the Krebs cycle are
H2O and CO2.
ATP and CO2.
ATP and O2.
ADP and H2O
What provides the electron transport chain in cellular respiration with the energy it needs to function?
ATP synthase
glycolysis
chlorophyll
Krebs cycle
Which of the following statements best describes cellular respiration?
Sunlight and carbon dioxide are used to make ATP.
ATP and oxygen are used to make sugars and starches.
Carbon-based molecules from food and oxygen are used to make ATP.
ATP and carbon dioxide are used to make ADP and water.
Which of the following are end products of glycolysis?
two three-carbon molecules, ATP, and NAD+
carbon dioxide, water, and ATP
NAD+, oxygen, and two ATP molecules
pyruvate, NADH, and ATP
What is the main function of the Krebs cycle?
breaking down pyruvate molecules to form molecules of NADH and oxygen
forming citric acid to make NADH, water, and CO2
producing molecules that carry high-energy electrons to the electron transport chain
bonding coenzyme A to pyruvate
In the electron transport chain, energy from the Krebs cycle is used to pump hydrogen ions
across the inner mitochondrial membrane.
through the ATP synthase enzyme in the mitochondrial matrix.
along a concentration gradient in the thylakoid.
along the thylakoid membrane.
What is the function of oxygen in cellular respiration?
to deliver hydrogen ions to the electron transport chain
to pick up electrons at the end of the electron transport chain
to provide oxygen for the production of carbon dioxide
to give a source of energy to the Krebs cycle
Which phrase best describes the main role of fermentation?
converts glucose into pyruvate and NADH
produces lactic acid to counteract an oxygen deficit
allows glycolysis to continue making a small amount of ATP
allowing anaerobic production of ADP
Which phrase about fermentation is correct?
takes place without oxygen
uses electron transport chain
only occurs in bacteria
is an aerobic process
Which end product of fermentation causes the burning feeling in muscles that are working hard?
carbon dioxide
pyruvate
alcohol
lactic acid
Why does a runner breathe hard for a few minutes after finishing a race?
The runner’s cells need oxygen to make lactic acid.
The runner’s cells continue the fermentation process.
The runner’s cells are making up for an oxygen deficit.
The runner’s cells cannot perform glycolysis.
Which end product of alcoholic fermentation is important in the baking industry?
lactic acid
carbon dioxide
ATP molecules
alcohol
What molecule carries chemical energy that cells use for their functions?
ADP
ATP
NAD+
NADP+
Which of the following molecules found in the food we eat is most commonly broken down to make ATP?
carbohydrates
lipids
proteins
vitamins
The water molecules labeled A in Figure 4.1 are going to the thylakoids to take part in which process?
light-dependent reactions
Krebs cycle
Calvin cycle
light-independent reactions
Which of the following directly provides the energy needed for cell functions?
A phosphate group is removed from ATP.
ADP loses a phosphate group.
Electrons are passed to proteins.
Oxygen picks up electrons.
Which of the following is a reactant in photosynthesis?
O2
C6H12O6
CO2
COOH
Chemosynthesis is a process through which some organisms use energy from chemicals in their environment to build sugars in the absence of
ATP
water
glucose
sunlight
Where in plant cells are the energy-absorbing molecules for photosynthesis located?
stroma
thylakoids
ATP synthase
mitochondria
What happens to the sugars that are made during photosynthesis?
They move directly into an electron transport chain.
They go back into the Calvin cycle.
They can be used for cellular respiration.
They make ATP by bonding together.
An electron transport chain that produces ATP is part of both the cellular respiration process and
glycolysis
fermentation
photosynthesis
the Krebs cycle
The part of cellular respiration that needs oxygen takes place inside the
nucleus
mitochondria
thylakoid
cytoplasm
In which process is lactic acid formed when there is not enough oxygen present for cellular respiration to take place?
ATP synthase
photosystem I
glycolysis
fermentation
Which process is best represented by the following chemical equation?
sugars + oxygen ® carbon dioxide + water
cellular respiration
photosynthesis
glycolysis
fermentation
Which process is best represented by the following chemical equation? sugars + oxygen ® carbon dioxide + water
cellular respiration
photosynthesis
glycolysis
fermentation
Before cellular respiration, glucose must be broken down by the process of
photosynthesis
glycolysis
electron transport
fermentation
Which of the following is a product of the Krebs cycle?
carbon dioxide
oxygen
lactic acid
glucose
Which of the following is best shown by Figure 4.2 below?
glycolysis
diffusion
the Krebs cycle
electron transport chain
Which of the following statements is true of ATP?
It stores energy as glucose.
It transfers energy to cell processes.
It releases energy when it gains a phosphate group.
It converts sunlight into chemical energy.
The breakdown of which of the following provides the largest number of ATP per molecule?
carbohydrates
lipids
proteins
cellulose
Which of the following best describes the molecules labeled B in Figure 4.1?
carbon monoxide entering the light-independent reactions
water entering the thylakoid membrane
carbon dioxide entering the Calvin cycle
oxygen entering an electron transport chain
Which of the following reactions provides the chemical energy for most cell functions?
ATP - P > ADP
ATP + P > ADP
ADP - P > ATP
ADP + P > ATP
Which process would bacteria living near a heat vent on the ocean floor use to build carbon-based molecules, such as sugars?
light-independent reactions
cellular respiration
fermentation
chemosynthesis
Which chemical equation best represents the process of photosynthesis?
6CO2 + 6O2 > C6H12O6 + 6O2
C6H12O6 + 6H2O > C6H12O6 + 6O2
6CO2 + 6H2O > C6H12O6 + 6O2
C6H12O6 + 6O2 > 6CO2 + 6H2O
Which of the following is the site of the photosystems in the light-dependent reactions of photosynthesis?
stroma
thylakoid membrane
ATP synthase
mitochondrial matrix
Which process is best represented by the chemical equation C6H12O6 + 6O2 > 6CO2 + 6H2O?
cellular respiration
photosynthesis
glycolysis
fermentation
What is the name of the process that breaks glucose down into the pyruvate that is used in cellular respiration?
fermentation
electron transport
glycolysis
the Krebs cycle
An electron transport chain is part of
the Krebs cycle only.
cellular respiration only.
both photosynthesis and cellular respiration.
both glycolysis and the Krebs cycle.
The aerobic stages of cellular respiration take place in the
cell membrane
mitochondria
cytoplasm
grana
Which process allows glycolysis to continue in the absence of oxygen?
chemosynthesis
photosystem I
cellular respiration
fermentation
What is the main function of the electrons shown in Figure 4.2?
provide energy to form water molecules
provide energy to break down glucose
provide energy to make ADP
provide energy to pump hydrogen ions
Which organisms use alcoholic fermentation to allow glycolysis to continue to produce ATP?
reptiles
yeasts
humans
mammals
When pyruvate is a reactant in cellular respiration it means that
oxygen is present.
all ATP is made in the cytoplasm.
only fermentation is taking place.
glycolysis has stopped.
