Bio Chapter 8 Test

Plants
What is an example of autotrophs?
ATP
The principle chemical compound that living things use to store energy is…?
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The amount of energy stored in a molecule of ATP compared to the amount stored in a molecule of glucose is…
Light and heat
When a candle burns, energy is released in the form of…
Autotrophs make their own food, and get their energy from the sun. Heterotrophs have to consume things for energy, and they cannot get their energy from the sun
How do heterotrophs and autotrophs differ in the way they obtain energy?
5 ribose (carbon sugar), adenine, and 3 phosphate groups
Describe the 3 parts of an ATP molecule
A single molecule of glucose stores more than 90 times the energy stored by ATP. Also, glucose has more energy than APT. However, ATP, which transfers energy quickly, is used by the cell as an immediate source of energy.
Compare the amounts of energy stored by ATP and glucose. Which compound is used by the cell as an immediate source of energy?
It wouldn’t be able to make food on its own because heterotrophs need to consume food for energy, and the plant would have no pigments.
If a plant is a heterotroph, can it make its own food?
Water and carbon dioxide
In addition to light and chlorophyll, photosynthesis requires…
Reflects green light
The leaves of a plant appear green because chlorophyll…
6CO2 + 6H2O + light energy = C6H12O6 + 6O2
What is the basic equation for photosynthesis?
Photosynthetic organisms capture energy from sunlight with pigments (they collect light from the sun).
What role do plant pigments play in the role of photosynthesis?
Thylakoid
In which structure do the light dependent reactions take place?
Stroma
In which structure do the light independent reactions take place?
In fall, chlorophyll molecules breakdown fastest and the accessory pigments remain which change the color.
Why do leaves change color in the fall?
Water (H2O), sunlight, and CO2
To stay alive, a plant needs…
Light absorption
The first process in the light dependent reaction of photosynthesis is…
NADPH and ATP
What substances from the light dependent reactions of photosynthesis is a source of energy for the Calvin cycle?
Dark reactions and the Calvin cycle
The light independent reactions of photosynthesis are also known as…
Hydrogen ions
ATP synthase in the chloroplast membrane makes ATP, utilizing using the energy of highly concentrated…
NADP+ carries energy by holding electrons in the form of hydrogen ions.
Explain the role of NADP+ as an energy carrier in photosynthesis
Water, light, and temperature. Without water, photosynthesis will slow or stop. Enzymes function best at 35 degrees Celsius, and they won’t function properly if it’s too cold or too hot. Too much or too little light can be harmful.
Discuss 3 factors that affect the rate at which photosynthesis occurs
The Calvin cycle uses ATP and NADPH (products of the light dependent) so it does not need sunlight
Describe why the Calvin cycle does not depend on light
The Calvin cycle uses ATP and NADPH produced during light dependent reactions to produce glucose. Products of light dependent reactions are reactants of the dark reactions.
How do the events in the Calvin cycle depend on the light dependent reactions of photosynthesis?
Make their own food from carbon dioxide and water
Autotrophs differ from heterotrophs because they…
Chlorophyll
The principle pigment in plants is…
ATP and NADPH
What are produced in light dependent reactions of photosynthesis?
Sugars (which are produced in dark reactions)
What is not produced in the light dependent reactions of photosynthesis?
Green
The color of light that is least useful to a plant during photosynthesis is…
Absorption of light energy
The first step in photosynthesis is the…
Chlorophyll, light, and water
In a typical plant, what are the factors necessary for photosynthesis?
ATP synthase is a protein (channel) it is used to allow H+ ions to pass through the membrane. H+ ions cause ATP synthase to rotate which causes it to bind ADP and a phosphate group together to form ATP.
Describe the role of ATP synthase and explain how it works
ATP and NADPH from the light dependent reactions are used with carbon dioxide and H2O to make high energy sugars (glucose)
Summarize the events of the Calvin cycle
NADP+ holds two high energy electrons in the form of hydrogen ions. Then it converts to NADPH where it can trap light in chemical form and carry high energy electrons elsewhere in the cell
Explain the role of NADP+ as an energy carrier in photosynthesis
light, chlorophyll, water, and carbon dioxide
Photosythesis requires…
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