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Flashcards in Photosynthesis Deck (32)
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1

The role of autotrophs and the two different kinds

Use inorganic Carbon as Carbon source, fix Carbon into organic compound (inorganic carbon CO2 to usable cellular form)
Photoautotrophs: use light energy to fix C (photosynthesis)
Chemoautotrophs: use redox energy (bacteria)

2

The role of heterotrophs and the two different kinds

Use organic carbon as carbon & energy source
Chemoheterotrophs: use organic as main nutrient (humans)
Photoheterotrophs: use light energy & organic carbon (prokaryotes)

3

Site of the Calvin Cycle?

Stroma

4

How many membranes in the chloroplasts

Double membrane

5

Overall reaction of photosynthesis

6CO2+6H2O+light = C6H12O6 + O2

6

Is Carbon in CO2 oxidized or reduced?

oxidized

7

Where do light reactions occur

Thylakoids

8

Is the Calvin cycle light dependent

No, light independent

9

What is the point of light reactions

Convery light energy into chemical energy in the form of ATP & NADPH; used to power Calvin cycle

10

What converts light energy into chemical energy

The photosystems

11

Where are the photosystems located

Thylakoid membrane

12

What is photolysis

When the energy absorbed by pigments (chlorophyll) in Photosystem II is used to split water (H2O to O2)

13

What is the energy conversion in Photosystem II?

Light energy is converted to chemical energy in the form of an excited electron

14

What is the electron transport chain?

Series of redox reactions that slowly release energy. Exists btw PII and PI

15

Is NADPH the oxidized or reduced form

reduced

16

Energy conversion in ETC?

Energy is released from redox reactions as the electron is passed down the chain, it is used to pump H+ into the thylakoid lumen (the inside)

17

Energy conversion in Photosystem I?

Excited electron is used to reduce NADP+

18

What is Chemiosmosis (photophosphorylation)

Formation of ATP using ATP synthase powered by H+ gradient created by the photosystems

19

What is ATP synthase

An enzyme that catalyzes (accelerates) the formation of ATP during chemiosmosis

20

Energy conversion in Chemiosmosis

Energy in H+ gradient powers ATP formation

21

What is NADPH?

An electron carrier between redox reactions (ie. from light reaction to calvin cycle)

22

Point of the Calvin cycle?

Convert CO2 to sugar (fix carbon)

23

How many times does the Calvin cycle turn to produce one molecule of G3P

3 times

24

What enzyme fixes Carbon

Rubisco

25

How many G3Ps in 1 Glucose

two

26

What is G3P

Glyceraldehydge 3 phosphate

27

Three phases of the Calvin cycle?

Carbon fixation -> Reduction ->Regeneration

28

What is the product of the Calvin cycle

G3P

29

How many CO2s need to enter the Calvin cycle to produce 1 G3P

three

30

Reaction of Rubisco

RuBP (5C's) + CO2 -> 6Cs