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Biol275 > Lecture 27 > Flashcards

Lecture 27 Flashcards

1
Q

Photosynthesis energy input

A

solar energy

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2
Q

Photosynthesis provides what

A

glucose and oxygen that we depend on for life

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3
Q

Photosynthesis equation

A

6CO2 + 6H2O -> C6H12O6 + 6O2

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4
Q

Photosynthesis parts

A

Part 1. Photosystem, which captures Solar energy and converts it into ATP
Part 2. Calvin cycle, which uses ATP to rearrange CO2 to make carbs (glucose)

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5
Q

Where does photosynthesis occur

A

in the chloroplasts of the plant

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6
Q

How may chloroplasts per plant cell

A

20-100

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7
Q

Stroma of the chloroplast

A

gel like and filled with enzymes

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8
Q

thylakoids of the chloroplast

A

flat sac-like structures

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9
Q

Granum of the chloroplasts

A

stack of thylakoids

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10
Q

Do photosynthetic prokaryotes have chloroplasts?

A

no, they are like free-living chloroplasts themselves

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11
Q

How is light captured by the plant to make ATP

A

light is captured by specialized molecules

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12
Q

Specialized molecules that capture molecules in plants to make ATP

A

Chlorophyll a and b

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13
Q

Chlorophyll a and b have what type of ions

A

they have a center Mg2+ (magnesium) ion and other groups (such as R) controlling alternating double bonds that move electrons around

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14
Q

Chlorophyll a and b have

A

different light absorption frequencies, so they only become excited at certain wavelengths because molecular structure determines this sensitivity

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15
Q

Why is chlorophyll a and b green

A

because green is not absorbed and bounces back to our eyes

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16
Q

Light energy has

A

properties of both waves and particles
short wavelengths have higher energy

17
Q

what do photons do

A

they excite electrons in chlorophyll atoms

18
Q

How do photosystems make ATP

A

by transferring excited electron energy (makes proton gradient)

19
Q

What are photosystems

A

they are thylakoid membrane complexes of proteins and chlorophyll that establish H+ proton gradient

20
Q

How some electron energy is transferred in photosystems

A

some chlorophyll molecules act as receiving antennas, passing energy from one to another chlorophyll
collection focuses on special chlorophyll molecules in reaction center that pass electrons out of photosystem

21
Q

Photosystem II steps

A

PS II rxn center has chlorophyll a molecule sensitive to 680nm wavelength

P680 transfers electrons to Qb (plastoquinone), which binds to stromal H+ to become QbH2

the missing electron from P680 is replaced by breaking H2O into O2 and H+

O2 diffuses out of cell and is released into air as waste

QbH2 takes H+ to cytochrome b/f which transfers the H+ to lumen

Resulting in building a H+ gradient across membrane which can fuel ATP synthesis

Biol275 (25 decks)

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