Ch 10 Photosynthesis Exam 3

Question 1

Photosynthesis

Answer 1

-use of sunlight to manufacture carbohydrates
-links together light capturing reactions and sugar producing(Calvin Cycle)
-CO2+H2O->CH2O+O2
-water and carbon dioxide don’t react with one another

Question 2

Autotrophs

Answer 2

-make their own food
-depended on by heterotrophs

Question 3

Heterotrophs

Answer 3

-obtain sugars and other macromolecules from other organisms
-depend on autotrophs

Question 4

Chloroplasts

Answer 4

-contain light capturing pigments

Question 5

Chlorophylls

Answer 5

-absorb strongly in blue and red
-provide plants with green appearance

Question 6

Carotenoids

Answer 6

-absorb blue and green
-appear yellow, orange, or red

Question 7

Resonance Energy Transfer

Answer 7

-energy in electron is transferred to nearby pigment

Question 8

Reduction/Oxidation

Answer 8

-energy is transferred to a new compound

Question 9

The Antenna Complex

Answer 9

-performs resonance energy transfer
-moves electrons along like a wave towards the reaction center

Question 10

The Reaction Center

Answer 10

-location of two specialized chlorophyll molecules
-translate the absorbed photon to an electron acceptor
-redox reaction
-very important step for photosynthesis

Question 11

Photosystems

Answer 11

-handle the electrons
-produce ATP and NADPH
-feed into the Calvin Cycle where carbohydrates are produced

Question 12

Z Scheme*

Answer 12

-connects Photosystems I and II

Question 13

Fixation Phase

Answer 13

-first step
-CO2 reacts with ribulose bisphosphate(RuBP) producing a 3 Carbon organic acid (3PGA)
-RuBP+3CO2->6 3PGA

Question 14

Reduction Phase

Answer 14

-second step
-3PGA is reduced to a phosphorylated sugar glyceraldehyde-3-phosphate G3P (glucose building block)
-6 3PGA+6 ATP+6 NADPH=5 G3P(to step 3) and 1 G3P yield

Question 15

Regeneration Phase

Answer 15

-third step
-G3P keeps cycle going to regenerate rubisco
5 G3P+3 ATP->3 RuBP

Question 16

Stomata

Answer 16

-pores that open and close that allow CO2 to enter and exit
-trade off is temperature so they don’t lose too much water
-form of CO2 regulation
-hot & dry days result in closing

Question 17

Photon

Answer 17

-tiny particle or bundle of electromagnetic radiation

Question 18

Electron Transport Chain

Answer 18

-cytochromes and quinones pass electrons down electron transport chain

Question 19

Sugars

Answer 19

-store a lot of potential energy
-plants use sugars for cellular respiration and to build all of the organic molecules in leaves and other structures

Question 20

Rubisco

Answer 20

-enzyme that fixes CO2 gas plus RuBP into 3PGA
-very inefficient
-oxygen can compete for active site, slowing down efficiency
-activated by molecules that are produced in the presence of light, but inhibited when CO2 concentrations are low