Exam #4 - Photosynthesis Flashcards Preview

BSC 2010 - Biology I > Exam #4 - Photosynthesis > Flashcards

Flashcards in Exam #4 - Photosynthesis Deck (119)
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1

Photosynthesis is the synthesis of _______.

sugar

2

Just as cellular respiration releases energy, photosynthesis _______ energy.

requires

3

In photosynthesis, we ______ energy to make sugar.

harvest

4

How do we store energy? Within....?

Electrons

5

Biochemically speaking, what is needed to make sugar?

1) Carbon source - raw material
2) Energy - sun
3) Electrons - store energy

6

We need a source of carbon to _____ those electrons to store that energy.

carry

7

Carbon fixation means making carbon _______.

organic

8

What does that mean? Making carbon "organic"?

Making carbon bonded to Hydrogen

9

Plants take carbon from the ___ and make it organic.

air. THAT'S THE SOURCE!

10

What is the process of photosynthesis?

6CO2 + 6H20 + Light energy ---> CH2O + O2

11

What is the delta G of this process?
Endothermic or exothermic?

+ 686 kcal/mol
Endothermic, requires energy

12

Is photosynthesis the reverse of cellular respiration?

NO. It's not the same process backwards

13

_______ is not the immediate product of photosynthesis . You can make glucose from the sugar product, but it is not the actual product.

Glucose

14

Only ___ CO2 is fixed at a time in the calvin cycle.
In other words, CO2 is metabolized ___ at a time.

one

15

6CO2 + 6H20 + Light energy --->CH2O + O2

Which reactant is oxidized?

H20

16

If you lose hydrogen, you're ________.
If you gain hydrogen, you're ________.

oxidized
reduced

17

6CO2 + 6H20 + Light energy ---> CH2O + O2

Which reactant is reduced?

CO2

18

What is CH2O?

A symbol for sugar.
A carbohydrate, CH2O

19

What do all organisms require?

Organic compounds

20

Who MAKES organic compounds from CO2?

Autotroph

21

What does autotroph mean?

Self feeder. You make your own food.

22

Who must OBTAIN organic compounds from other organisms?

Heterotrophs

23

Animals are ________.

heterotrophs

24

Photosynthesis is making _____ from the energy of ______.

sugar, light

25

It's an energy transformation, from light energy into ______ energy stored in sugar.

chemical

26

In eukaryotes, photosynthesis occurs in _________.

chloroplasts

27

Do prokaryotes do photosynthesis? If so, which ones?

Cyanobacteria are photosynthetic, but they don't do photosynthesis because they don't have chloroplasts

28

Eukaryotes do photosynthesis in _______, and in plants, it happens in _______.

chloroplasts, leaves

29

Are there any non-plant eukaryotes that can do photosynthesis?

The protist Euglena - photosynthetic

30

The leaf absorbs ___ from the atmosphere.

CO2