Glossary 2.7

The glossary provides definitions and explanations of key terms and concepts essential to understand the topic in the lesson. Be sure to familiarize yourself with each term before attempting the lesson glossary quiz.

Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

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A

Absorption spectrum

a plot of the amount of light energy of various wavelengths that a substance absorbs

Action spectrum

a plot of the effectiveness of light energy of different wavelengths in driving a chemical process

Antenna complex

a cluster of light-absorbing pigments embedded in the thylakoid membrane able to capture and transfer energy to special chlorophyll a moledules in the reaction centre

C

Calvin cycle

the second stage of the photosynthesis process that uses ATP and NADPH to convert \( CO_2 \) to sugars

L

Light-dependent reactions

the first stage of photosynthesis, during which water molecules are split as light energy is absorbed and transformed into chemical energy in ATP and NADPH

P

Photoautotroph

an organism that makes its own food using energy from the Sun

Photosystem I

a collection of pigment proteins that includes chlorophyll a and absorbs light at the 700 nm wavelength

Photosystem II

a collection of pigment proteins that includes chlorophyll a and absorbs light at the 680 nm wavelength

Primary electron acceptor

a molecule capable of accepting electrons and becoming reduced during photosynthesis

R

Reaction centre

a complex of proteins and pigments that contains the primary electron acceptor

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