lecture 19 part 1

Question 1

why do most leaves appear green to us

Answer 1

because chlorophyll reflects green (we see reflected color)

Question 2

where is chlorophyll found

Answer 2

leaves

chlorophyll are in chloroplasts in membranes that form thylakoids

Question 3

4 things that happen during light rxns of photosynthesis

Answer 3

1)make ATP using photophosphorylation
2) split H2O
3)O2 is released
4)reduce NADP+ to NADPH

Question 4

organisms that perform photosysnthesi

Answer 4

plants
-multicellular algae
-cyanobacteria
-purple sulfur bacteria
-universal eukkaryotes (ie phytoplankton)

Question 5

photoautotrophs

Answer 5

produce their own food (chem energy) using light energy

Question 6

primary producers make

Answer 6

food for primary consumers

Question 7

why do plants perform photosyetsis

Answer 7

to make compounds necessary for cellular respiration and for making new bio moleqs

Question 8

plants do both

Answer 8

cellular respiration and photosynthesis

Question 9

where are chloroplasts found

Answer 9

mainly in cells of the mesophyll, the interior tissue of the leaf

Question 10

how many chloorplasts do mesophyll contain

Answer 10

30-40

Question 11

thylakoid membranes are location of

Answer 11

pigments and enzymes that capture light energy and convert it into chem energy (ATP + NADPH)

Question 12

stroma

Answer 12

location of enzymes that bind CO2 and convert it into sugar

Question 13

granum

Answer 13

stack of thylakoids

Question 14

space inside of cell (like what cytosol would be but in chloroplast

Answer 14

stroma

Question 15

describe the light rxn in thylakoid membranes

Answer 15

-split H2O
-release O2
-reduce e- acceptor NADP+ to NADPH
-generate ATP from ADP and Pi by photophosphorylation

Question 16

does calcin cycle require light

Answer 16

yes but indirectly

Question 17

calvin cycle happens in

Answer 17

stroma

Question 18

describe calvin cycle

Answer 18

-forms sugar from CO2 using ATP + NADPH
-begins with carbon fixation incorporating CO2 into organic moleqs

Question 19

overall photosyntesis rxn, what is reduced, what is oxidized

Answer 19

energy + 6CO2 + 6H2O -> C6H12O6 + 6O2

reduced: CO2 -> C6H12O6
oxidized: H2O -> O2

Question 20

light is a form of

Answer 20

electromagnetic energy

Question 21

light travels in ______ waves

Answer 21

rhythmic

Question 22

wavelenth is

Answer 22

distance between crests and waves

Question 23

light also behaves as though it consists of discrete particles called

Answer 23

photons

Question 24

pigments are

Answer 24

substances that absorb visible light

Question 25

different pigments absorb different

Answer 25

wavelengths

Question 26

wavelnegths that are not absorbed are

Answer 26

relfected or trasnmitted

Question 27

we see light that is

Answer 27

relfected or transmitted

Question 28

white =

Answer 28

all relfected

Question 29

black =

Answer 29

all absrobed

Question 30

types of photosynthetic pigment

Answer 30

chlorophyll a + b

Question 31

chlorophyll a is

Answer 31

three main photosynthetic pigment

Question 32

chlorophyll b

Answer 32

broadens the light spectrum used for photosyntheis

Question 33

difference between chlorophyll a + b

Answer 33

difference in absorption spectrum is due to a slight structural differnce between the pigment molecules

Question 34

cartenoids are what type of pigment

Answer 34

yellow-orange pigments

Question 35

cartenoids are

Answer 35

accessory pigemnts

Question 36

what do carternoids do

Answer 36

absorb light for photosynthesis (minor role compared to chlorophyll)
-absorb excessive light that would be damaged chlorophyll (important job)