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Biology Chapter 8
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20
Biology
9th Grade
10/14/2008

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Term
Autotrophs
Definition
Use light energy from the sun to produce food.
Term
Heterotrophs
Definition
Obtain energy from the foods they consume.
Term
ATP
Definition
One of the principal chemical compounds that cells use to store and release energy. Consists of adenine, a 5-carbon sugar (ribose), and three phosphate groups.
Term
photosynthesis
Definition
the process in which plants use the energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates-sugars and starches- and oxygen, a waste product.
Term
pigments
Definition
plants gather the sun's energy with light-absorbing molecules called pigments.
Term
chlorophyll
Definition
The plant's principal pigment.
Term
thylakoid
Definition
saclike photosynthetic membrane found in chloroplasts
Term
photosystem
Definition
light-collecting units of the chloroplast
Term
stroma
Definition
region outside the thylakoid membranes in chloroplasts
Term
NADP+
Definition
one of the carrier molecules that transfers high-energy electrons from chlorophyll to other molecules
Term
light-dependent reactions
Definition
reactions of photosynthesis that use energy from light to produce ATP and NADPH
Term
ATP synthase
Definition
large protein that uses energy from H+ ions to bind ADP and a phosphate group together to produce ATP
Term
Calvin cycle
Definition
reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugars
Term
What is the basic energy source of all cells?
Definition
ATP
Term
What do light-dependent reactions do?
Definition
produce oxygen gas and convert ADP and NADP+ into ATP and NADPH. Occur in thylakoid.
Term
What does the Calvin cycle do?
Definition
uses ATP and NADPH from the light-dependent reactions to produce high-energy sugars. Light-independent reactions.
Term
Joseph Priestley
Definition
Uses bell jar, candle, and plant to find that plants release oxygen
Term
Jan van Helmont
Definition
Concludes that trees gain most of their mass from water
Term
Jan Ingenhousz
Definition
finds that aquatic plants produce oxygen bubbles in the light but not in the dark. Concludes that plants need sunlight to produce oxygen.
Term
Photosynthesis Equation
Definition
carbon dioxide+water=sugars+oxygen
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