Chapter 6

Question 1

photoautotrophs that are able to synthesize their own food

Answer 1

plants, some bacteria, and some protists

Question 2

___ use the sun’s energy to produce ___ and oxygen as a byproduct

Answer 2

photoautotrophs; carbohydrates

Question 3

___ must get their energy source from autotrophs

Answer 3

heterotrophs

Question 4

the sun’s energy travels in “packets” of light called ___

Answer 4

photons

Question 5

___ in photoautotrophs are able to “catch” the energy in photons

Answer 5

pigments

Question 6

photon energy bumps up ___ in the pigments to a higher energy level, ___ the potential energy of those electrons

Answer 6

an electron; increasing

Question 7

potential electron energy is used to “fix” ___ into sugar

Answer 7

carbon

Question 8

the main pigment in most photoautotrophs is chlorophylls ___ and ___

Answer 8

a & b

Question 9

chlorophylls a & b capture ___ and ___ light of the visible portion of the electromagnetic spectrum

Answer 9

-

Question 10

___ are the organelles present in photosynthetic eukaryotes

Answer 10

chloroplasts

Question 11

leaves have pores called ___ that allow entry of carbon dioxide

Answer 11

stomata (singular: stoma)

Question 12

accessory pigments

Answer 12

carotenoids, phycobilins, anthocyanins

Question 13

chloroplasts contain ___ which are stacked and contain many membranes

Answer 13

thylakoids

Question 14

the semifluid space between the thylacoids is the ___

Answer 14

stroma

Question 15

the two reactions of photosynthesis

Answer 15

light-dependent, light-independent

Question 16

the light-dependent reaction occurs in the ___

Answer 16

thylakoid membrane

Question 17

the light-independent reaction occurs in the ___

Answer 17

stroma

Question 18

driven by light energy, the photosynthesis equation is ___

Answer 18

12H2O + 6CO2 = C6H12O6 (glucose) + 6H2O (water byproduct)

Question 19

the light-dependent reaction produces ___ energy

Answer 19

ATP & NADPH

Question 20

the light-independent reaction produces ___ using the ATP from the light-dependent reaction. ___ is a byproduct.

Answer 20

sugar; oxygen

Question 21

the thylacoid membranes contain ___ that trap the sun’s photon energy

Answer 21

photosystem I and photosystem II

Question 22

the ___ molecules are facing each other in the photosystem, where electrons are “popped” off

Answer 22

chlorophyll a

Question 23

free electrons immediately enter ___ next to each photosystem

Answer 23

an electron transfer chain

Question 24

“lost” electrons is replaced by the splitting of ___

Answer 24

water in photosystem II ***

Question 25

lost electrons will be captured and donated to ___ molecules

Answer 25

acceptor

Question 26

as electrons are accepted and donated down the electron transfer chain, a ___ is building up

Answer 26

proton gradient

Question 27

___ from the stroma is transferred into the inner thylakoid compartment and will eventually build up enough to create a large proton gradient

Answer 27

hydrogen

Question 28

hydrogen ions move across the thylakoid membrane and back into the stroma through protein channels called ___, producing ATP

Answer 28

ATP synthase

Question 29

ATP is formed by the ___ gradients created between the thylakoid and the stroma

Answer 29

electrical and proton

Question 30

some plants that live in hot, dry conditions cannot ___ during the day or in very dry conditions

Answer 30

open their stomata

Question 31

photosystem II is ___

Answer 31

non-cyclic

Question 32

photosystem I is ___

Answer 32

cyclic