Why are leaves red in the fall?(1 point)
Responses
Chlorophyll absorbs red in the fall, rather than green.
Chlorophyll absorbs red in the fall, rather than green.
Chlorophyll breaks down because there's less sunlight.
Chlorophyll breaks down because there's less sunlight.
Chlorophyll reflects green light in the fall.
Chlorophyll reflects green light in the fall.
Mitochondria breaks down because there's less sunlight.
21 answers
Chlorophyll absorbs red in the fall, rather than green.
Which statement is true?(1 point)
Responses
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
Responses
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the thylakoid membrane.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-dependent (needs light) step of photosynthesis and happens in the stroma.
The Calvin cycle is the light-independent (does not need light) step of photosynthesis and happens in the stroma.
The original energy for photosynthesis to begin comes from:(1 point)
Responses
water molecules
water molecules
carbon dioxide molecules
carbon dioxide molecules
light
light
ATP
Responses
water molecules
water molecules
carbon dioxide molecules
carbon dioxide molecules
light
light
ATP
light
Which equation best models cellular respiration?(1 point)
Responses
C6H12O6 + 6O2 + 6CO2 → 6H2O + Energy
C 6 H 12 O 6 + 6O 2 + 6CO 2 → 6H 2 O + Energy
6H2O + 6CO2 → C6H12O6 + 6O2 + Energy
6H 2 O + 6CO 2 → C 6 H 12 O 6 + 6O 2 + Energy
6H2O + 6CO2 + Energy → C6H12O6 + 6O2
6H 2 O + 6CO 2 + Energy → C 6 H 12 O 6 + 6O 2
C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy
Responses
C6H12O6 + 6O2 + 6CO2 → 6H2O + Energy
C 6 H 12 O 6 + 6O 2 + 6CO 2 → 6H 2 O + Energy
6H2O + 6CO2 → C6H12O6 + 6O2 + Energy
6H 2 O + 6CO 2 → C 6 H 12 O 6 + 6O 2 + Energy
6H2O + 6CO2 + Energy → C6H12O6 + 6O2
6H 2 O + 6CO 2 + Energy → C 6 H 12 O 6 + 6O 2
C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy
C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy
Lactic acid fermentation can be modeled by which equation?(1 point)
Responses
Pyruvic acid + NADH → Lactic acid + NAD+
Pyruvic acid + NADH → Lactic acid + NAD+
Lactic acid + NADH → Pyruvic acid NADH
Lactic acid + NADH → Pyruvic acid NADH
Pyruvic acid + NAD+ → Lactic acid + NADH
Pyruvic acid + NAD+ → Lactic acid + NADH
Lactic acid + NADH → Pyruvic acid + NAD+
Responses
Pyruvic acid + NADH → Lactic acid + NAD+
Pyruvic acid + NADH → Lactic acid + NAD+
Lactic acid + NADH → Pyruvic acid NADH
Lactic acid + NADH → Pyruvic acid NADH
Pyruvic acid + NAD+ → Lactic acid + NADH
Pyruvic acid + NAD+ → Lactic acid + NADH
Lactic acid + NADH → Pyruvic acid + NAD+
Lactic acid + NADH → Pyruvic acid + NAD+
In the Krebs cycle, how is citric acid formed?(1 point)
Responses
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Enzymes combine hydrogen ions, oxygen, and electrons.
Enzymes combine hydrogen ions, oxygen, and electrons.
Carbon dioxide bonds with a chain of coenzyme A.
Carbon dioxide bonds with a chain of coenzyme A.
Pyruvic acid molecules are broken down by an acetyl group.
Responses
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Enzymes combine hydrogen ions, oxygen, and electrons.
Enzymes combine hydrogen ions, oxygen, and electrons.
Carbon dioxide bonds with a chain of coenzyme A.
Carbon dioxide bonds with a chain of coenzyme A.
Pyruvic acid molecules are broken down by an acetyl group.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.
The following are steps of cellular respiration except(1 point)
Responses
electrolysis
electrolysis
glycolysis
glycolysis
electron transport chain
electron transport chain
the Krebs cycle
Responses
electrolysis
electrolysis
glycolysis
glycolysis
electron transport chain
electron transport chain
the Krebs cycle
electrolysis
How are fossil fuels formed?(1 point)
Responses
from decaying matter not recycled into the atmosphere
from decaying matter not recycled into the atmosphere
by photosynthesis
by photosynthesis
from water released by plants
from water released by plants
by heat energy intensifying over the ocean
Responses
from decaying matter not recycled into the atmosphere
from decaying matter not recycled into the atmosphere
by photosynthesis
by photosynthesis
from water released by plants
from water released by plants
by heat energy intensifying over the ocean
from decaying matter not recycled into the atmosphere
If an organism obtains energy from glucose, which process does it undergo?(1 point)
Responses
transpiration
transpiration
evaporation
evaporation
cellular respiration
cellular respiration
the water cycle
Responses
transpiration
transpiration
evaporation
evaporation
cellular respiration
cellular respiration
the water cycle
cellular respiration
How does hydrogen bonding affect water as it becomes colder and eventually freezes?(1 point)
Responses
It makes ice float on top of water instead of sink.
It makes ice float on top of water instead of sink.
It allows water molecules to freeze in random patterns.
It allows water molecules to freeze in random patterns.
It creates tight spaces between water molecules.
It creates tight spaces between water molecules.
It causes ice to become more dense than water.
Responses
It makes ice float on top of water instead of sink.
It makes ice float on top of water instead of sink.
It allows water molecules to freeze in random patterns.
It allows water molecules to freeze in random patterns.
It creates tight spaces between water molecules.
It creates tight spaces between water molecules.
It causes ice to become more dense than water.
It makes ice float on top of water instead of sink.
What is a pure substance made of positive and negative ions in a fixed ratio called?(1 point)
Responses
an atom
an atom
a hydrogen bond
a hydrogen bond
an ionic compound
an ionic compound
a polar molecule
Responses
an atom
an atom
a hydrogen bond
a hydrogen bond
an ionic compound
an ionic compound
a polar molecule
an ionic compound