UIUC IB 150 ACTUAL TEST PAPER 2026
QUESTIONS WITH SOLUTIONS GRADED A+
◉ 10% rule of trophic efficiency. Answer: transfer of biomass from a
lower trophic level to the next one higher in which 10% of biomass
gained is stored as energy
◉ abiotic. Answer: anything non-living
◉ activation energy. Answer: energy that is required for an
endergonic reaction to occur
◉ active site. Answer: location in an enzyme where substrates bind
and react with one another
◉ alternative hypothesis. Answer: specifies what should be
observed when the claim is correct
◉ ATP. Answer: energy storing molecule, a ribose sugar and 3
phosphate groups; energy is stored on the molecules chemical bonds
and can be used quickly and easily by cells
,◉ ADP. Answer: the releasing of a phosphate group from ATP, results
in a release of energy that is used for biological reactions
◉ ATP synthase. Answer: important enzyme in the inner
mitochondrial membrane that converts ADP and Pi into ATP
◉ biotic. Answer: anything alive
◉ birth rate (b). Answer: rate of offspring being produced, when
subtracted by death rate the r value is the difference
◉ Calvin cycle. Answer: part of photosynthesis were CO2, ATP and
NADPH are used to make G3P, ADP, NADP+, and Pi. RuBP is recycled.
process done twice, glucose is made. occurs in stroma of
chloroplasts.
◉ carbon fixation. Answer: process in which CO2 is converted to an
organic molecule. ex. RuBP in Calvin cycle to make 2 3PGA
◉ carrying capacity (k). Answer: total amount of organisms a region
can support
◉ catalyst. Answer: substance that increases the rate of reaction
without it being chemically changed in the process
,◉ aerobic cellular respiration. Answer: process in which many ATP
molecules produced through the following processes in order:
glycolysis, citric acid cycle, electron transport chain
◉ anaerobic cellular respiration. Answer: process which ATP is
produced similar to aerobic but uses different final electron
acceptors such as sulfate or nitrate instead of oxygen
◉ chlorophyll. Answer: green pigments located in the thylakoid
membrane that are given off by the chloroplast that absorbs light
except green
◉ chloroplast. Answer: plastid that contains chlorophyll and in
which photosynthesis takes place
◉ citric acid cycle. Answer: series of 8 chemical reactions that
occurs in the mitochondrion matrix starting with citrate and ending
with oxalacetate. during this process, oxalacetate reacts with acetyl
CoA to form citrate that oxidized glucose to CO2 molecules and
molecules of NADPH, 1 mol of FADH2 and 1 mol of ATP or GTP
◉ controlled experimental design. Answer: na experiment designed
to test the hypothesis in which there is a controlled variable involved
within the independent and dependent variables to test hypothesis
, ◉ control treatment. Answer: group does not receive treatment to
compare
◉ death rate (d). Answer: rate at which a specific species is dying
◉ dependent variable. Answer: variable dependent on other
variables and it is what is measured
◉ ecological efficiency. Answer: efficiency of energy transferred
from lower trophic levels to the upper ones
◉ ecosystem. Answer: all of the organisms that are living in the
same environment with abiotic factors affecting their way of life
◉ ectothermy. Answer: term to describe organisms that gain their
internal heat through external factors, mainly environment
◉ primary electron acceptor. Answer: first electron acceptor in
photosynthesis and cellular respiration
◉ final electron acceptor. Answer: final electron acceptor in
photosynthesis and cellular respiration
QUESTIONS WITH SOLUTIONS GRADED A+
◉ 10% rule of trophic efficiency. Answer: transfer of biomass from a
lower trophic level to the next one higher in which 10% of biomass
gained is stored as energy
◉ abiotic. Answer: anything non-living
◉ activation energy. Answer: energy that is required for an
endergonic reaction to occur
◉ active site. Answer: location in an enzyme where substrates bind
and react with one another
◉ alternative hypothesis. Answer: specifies what should be
observed when the claim is correct
◉ ATP. Answer: energy storing molecule, a ribose sugar and 3
phosphate groups; energy is stored on the molecules chemical bonds
and can be used quickly and easily by cells
,◉ ADP. Answer: the releasing of a phosphate group from ATP, results
in a release of energy that is used for biological reactions
◉ ATP synthase. Answer: important enzyme in the inner
mitochondrial membrane that converts ADP and Pi into ATP
◉ biotic. Answer: anything alive
◉ birth rate (b). Answer: rate of offspring being produced, when
subtracted by death rate the r value is the difference
◉ Calvin cycle. Answer: part of photosynthesis were CO2, ATP and
NADPH are used to make G3P, ADP, NADP+, and Pi. RuBP is recycled.
process done twice, glucose is made. occurs in stroma of
chloroplasts.
◉ carbon fixation. Answer: process in which CO2 is converted to an
organic molecule. ex. RuBP in Calvin cycle to make 2 3PGA
◉ carrying capacity (k). Answer: total amount of organisms a region
can support
◉ catalyst. Answer: substance that increases the rate of reaction
without it being chemically changed in the process
,◉ aerobic cellular respiration. Answer: process in which many ATP
molecules produced through the following processes in order:
glycolysis, citric acid cycle, electron transport chain
◉ anaerobic cellular respiration. Answer: process which ATP is
produced similar to aerobic but uses different final electron
acceptors such as sulfate or nitrate instead of oxygen
◉ chlorophyll. Answer: green pigments located in the thylakoid
membrane that are given off by the chloroplast that absorbs light
except green
◉ chloroplast. Answer: plastid that contains chlorophyll and in
which photosynthesis takes place
◉ citric acid cycle. Answer: series of 8 chemical reactions that
occurs in the mitochondrion matrix starting with citrate and ending
with oxalacetate. during this process, oxalacetate reacts with acetyl
CoA to form citrate that oxidized glucose to CO2 molecules and
molecules of NADPH, 1 mol of FADH2 and 1 mol of ATP or GTP
◉ controlled experimental design. Answer: na experiment designed
to test the hypothesis in which there is a controlled variable involved
within the independent and dependent variables to test hypothesis
, ◉ control treatment. Answer: group does not receive treatment to
compare
◉ death rate (d). Answer: rate at which a specific species is dying
◉ dependent variable. Answer: variable dependent on other
variables and it is what is measured
◉ ecological efficiency. Answer: efficiency of energy transferred
from lower trophic levels to the upper ones
◉ ecosystem. Answer: all of the organisms that are living in the
same environment with abiotic factors affecting their way of life
◉ ectothermy. Answer: term to describe organisms that gain their
internal heat through external factors, mainly environment
◉ primary electron acceptor. Answer: first electron acceptor in
photosynthesis and cellular respiration
◉ final electron acceptor. Answer: final electron acceptor in
photosynthesis and cellular respiration
