Lecture 8- Photosynthesis

Question 1

Autotroph=

Answer 1

use inorganic C as the C source to fix C into an organic compound

Question 2

Photoautotroph=

- ex

Answer 2

use light energy to fix C

- ex= photosynthesis

Question 3

Chemoautotroph=

lithotrophs

Answer 3

use redox energy to fix C (bacteria only)

Question 4

Heterotrophs=

Answer 4

use organic C as a C source and usually energy source

Question 5

Chemoheterotroph=

ex.

Answer 5

use organic C as main nutrient

ex humans

Question 6

Photoheterotrophs=

Answer 6

use light energy and organic C

* prokaryotes only- very rare

Question 7

Fixation of an element=

Answer 7

taking the element from the atmosphere (eg CO2) and converting it into organic

Question 8

The ______is the site of photosynthesis

Answer 8

chloroplast

Question 9

Site of light rxns= _____ _____

Answer 9

thylakoid membrane

Question 10

Site of Calvin cycle =

fxn?

Answer 10

stroma

fxn= C fixation

Question 11

___ is the lowest energy form of C because it’s ___

Answer 11

CO2

oxidized

Question 12

Overall rxn of photosynthesis

Answer 12

6CO2+ 6H20 + light = C6H12O6 (glucose) +O2 (waste)

Question 13

What’s the point of the light rxns?

Answer 13

use energy carried by light & convert it into chemical energy in the form of ATP and NADPH that’ll be used to power the Calvin Cycle

Question 14

Light is absorbed by ____

What happens to the light that’s absorbed?

Answer 14

pigments

• absorbed light is released as heat or fluorescence (if there’s no way to capture the energy)
• absorbed light can be captured and used as an energy source (eg solar panels); photosynthesis captures light energy and converts it into chemical energy