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Flashcards in Unit 6 Test Deck (27)
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1

Photosynthesis

Process by which plants use the suns energy to turn carbon dioxide into sugar

2

Law of conservation of mass

Mass cannot be created or destroyed, but it can change form

3

Potential energy

Stored energy

4

Kinetic energy

Energy in motion

5

Visible light

Wavelengths you can see

6

Ultraviolet light

Wavelength that penetrates living tissue

7

Infrared

Heat energy

8

Cyanobacteria

Photosynthetic bacteria

9

Light independent reactions

Reaction that does not need sunlight

10

Light dependent reactions

Reaction only occurs when sunlight is available

11

Stomata

Tiny pores in the leaves

12

G3P

Carbon sugar

13

Rubisco

Enzyme that attaches carbon dioxide to a 5-carbon molecule RUBP

14

Dehydration

Water loss in the stomata

15

Photorespiration

Oxygen is added to the Calvin cycle instead of carbon dioxide

16

Amyloplasts

Specialized storage organelles that produce and store starch

17

For a long time, the conventional wisdom was that plants gained most of their mass by "eating" or absorbing nutrients from soil. In reality, where does most of their mass come from?

Water from soil and carbon from the air--- Von Helmont did the "willowtree experiment" to prove this

18

What is the kinetic energy that plants utilize in photosynthesis? What form of potential energy are they producing?

Conversion of sunlight into glucose; Glucose

19

What specific wavelengths of energy are utilized in photosynthesis?

Infrared

20

Write out the complete reaction for photosynthesis. Which reactant molecules provide the atoms of carbon, hydrogen, and oxygen needed to synthesize glucose?

Carbon dioxide and H2O are used to make sugar which can then be used to produce starts or cellulose---know it in non word form also

21

Why is the enzyme RuBisCO called "bridge to life"? What exactly does it do?

Carbon dioxide is considered a lifeless molecule and it attaches to a different molecule

22

Which pigments of visible light do plants absorb and use for photosynthesis? Which are reflected?

All but green; green

23

What conditions lead to photorespiration? Why is it considered a wasteful process for plants?

The stomata is closed and no sugar is produced

24

Compare how C4 and CAM plants are adapted to minimize the costs of photorespiration. Give one example of each.

C4- move the carbon fixation process to the mesophyll. Example- corn

CAM- only open their stomata at night. Example- cactus

25

What is the Calvin cycle

It uses ATP and NADPH to produce high-energy sugars. The Calvin cycle takes place in the Stroma of chloroplasts and does not require light

26

What are the four steps of the Calvin cycle

1. Six carbon dioxide molecules enter the cycle from the atmosphere. Those six carbon dioxide molecules combined with six 5-carbon molecules. The result is twelve 3-carbon molecules.
2. Energy input. Energy from ATP and high-energy electrons from NADPH are used to convert the twelve 3-carbon molecules into higher energy forms
3. 6-carbon sugar produced. Two 3-carbon molecules are removed from the cycle to produce sugars, lipids, amino acids, and other compounds
4. The 10 remaining three carbon molecules are converted back into six 5-carbon molecules, which are used in the next cycle

27

Photoautotroph

Self, light, nutrients