Photosynthesis Definitions

Question 1

The reds, pinks, purples and blues in plants come from compounds called

Answer 1

anthocyanins

Question 2

Their peak absorbance is around ___

Answer 2

500 nm (blue-green)

Question 3

What is the job of an anthocyanin?

Answer 3

• They serve as attractants (and sometimes repellants)
• They also absorb UV-B light and protect DNA (much as melanins do in animals)
• They may protect the vulnerable photo-synthetic apparatus from too much light

Question 4

is the conversion of the kinetic energy of light to the potential energy in the covalent bonds of organic compounds

Answer 4

Photosynthesis

Question 5

occurs in plants, algae, certain other protists, and some prokaryotes

Answer 5

Photosynthesis

Question 6

The light reactions take place at the …..

Answer 6

thylakoid membrane

Question 7

absorb red and blue light

Answer 7

chlorophylls

Question 8

What absorb additional wavelengths and broaden the spectrum used for photosynthesis?
(such as chlorophyll b)

Answer 8

Accessory Pigments

Question 9

light-absorbing “head” of molecule; note the magnesium atom at the center

Answer 9

Porphyrin ring:

Question 10

interacts with hydro-phobic regions of proteins inside thylakoid membranes of chloroplasts

Answer 10

Phytol Tail

Question 11

The prominent red pigment in beets is called

Answer 11

betanin

Question 12

Betacyanins are members of a class of glycosylated compounds called what?

Answer 12

betalains

Question 13

Role of betalains?

Answer 13

Uncertain possibly fungi

Question 14

At the center is a pair of chlorophyll molecules is the?

Answer 14

Reaction center

Question 15

The assemblage of chlorophylls and accessory pigments is called a

Answer 15

photosystem

Question 16

What are absorbed by the pigment molecules of a photosystem?

Answer 16

Photons of light

Question 17

Chloroplasts and mitochondria generate ATP by the same basic mechanism:

Answer 17

chemiosmosis