Chapter 10 - Photosynthesis

Question 1

Chloroplasts are ______ powered by the ___

Answer 1

chemical factories powered by the sun

Question 2

What part transforms light energy into the chemical energy of ATP and NADPH

Answer 2

The chloroplasts’ thylakoids

Question 3

The ATP and NADPH will be used to

Answer 3

Synthesize glucose and other molecules that can be used as energy sources

Question 4

What kind of energy is light

Answer 4

Electromagnetic energy/radiation

Question 5

Substances that absorb visible light

Answer 5

Pigments (in photosystems)

Question 6

Why do we see green when we look at a leaf?

Answer 6

Chlorophyll absorbs violet-blue and red light while transmitting and reflecting green light.

Question 7

What keeps chlorophyll in the membrane?

Answer 7

It’s hydrophobic tail, which interacts with proteins inside of the thylakoid membranes of chloroplasts

Question 8

What part of chlorophyll absorb light

Answer 8

phosphorin ring
is the head of the molecule
Mg atom center

Question 9

Chlorophyll A

Answer 9

Key light capturing pigment, participates directly in the light rxns

Question 10

Chlorophyll B

Answer 10

Work with A - called cartenoids

Absorb light and help release energy as heat

Question 11

Green colour absorbed by chlorophylls and carotenoids?

Answer 11

NO! which is why we see green, it’s reflected back into our eyes

Question 12

Photosystem composed of

Answer 12

A rxn centre complex surrounded by several light-harvesting complexes

Question 13

Rxn centre

Answer 13

Organized association of proteins with a special pair of chlorphyll A molecules

Question 14

Light harvesting complex

Answer 14

Consists of various pigment molecules (ca,cb or cart) bound to proteins

Question 15

Citric Acid Cycle: Catabolic or Anabolic

Answer 15

catabolic

(oxidize acetyl CoA and using energy to synthesize ATP

Question 16

Calvin Cycle

Answer 16

Anabolic

Building carbohydrates from smaller molecules and consuming energy

Question 17

Carb produced directly from the calvin cycle is

Answer 17

G3P!

after 3 cycles

Question 18

Carbon fixation

Answer 18

INintial incorporation of CO2 into organic material

Question 19

How Carbon Fixation happens

Answer 19

Attach one CO2 to RuBP with the enzyme Rubisco

Question 20

3 molecules of CO2, how many G3P

Answer 20

six….but only one as NET GAIN, other five used to regenerate RUBP

Question 21

RuBP is for?

Answer 21

CO2 acception

Question 22

To synthesize one glucose molecule, the Calvin cycle uses molecules of CO2, molecules of ATP, and molecules of NADPH.

Answer 22

6, 18, 12

Question 23

Explain why the large numbers of ATP and NADPH molecules used during the Calvin cycle are consistent with the high value of glucose as an energy source.

Answer 23

he more potential energy a molecule stores, the more energy and reducing power is required for the formation of that molecule. Glucose is a valuable energy source because it is highly reduced, storing lots of potential energy in its electrons. To reduce CO2 to glucose, much energy and reducing power are required in the form of large numbers of ATP and NADPH molecules, respectively

Question 24

Explain why a poison that inhibits an enzyme of the Calvin cycle will also inhibit the light reactions.

Answer 24

The light reactions require ADP and NADP+, which would not be formed in sufficient quantities from ATP and NADPH if the Calvin cycle stopped.