Flashcards in science: chpt. 8 test Deck (21)
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Is light used in light-dependent or light-independent reactions?
Light-dependent
1
How many carbon dioxide are involved in the first step of the Calvin cycle?
Six
2
What happens to some of the energy in photosynthesis?
It is converted to heat
3
An organism that uses hydrogen sulfide as its primary energy source is…
Chemoautotrophs
4
Is photosynthesis anabolic or catabolic? Why?
Anabolic, because it builds substances
5
Which one of these converts chemical energy to mechanical energy?
– Photosynthesis
– Cellular respiration
– Muscle contractions
Muscle contractions
6
How many “turns” of Kreb's cycle does it take to break down glucose?
Two
7
Glycolysis generates two ATP and two pyruvate. Which one holds more energy? Why?
Pyruvate because pyruvate is going to get broken down into more than two ATP.
8
True/False – C4 plants keep their stomata closed during hot days.
True, because they are holding on to the water
9
Why are leaves green except during autumn?
Because chlorophyll is the most abundant.
10
What happens in the second step of the Calvin cycle?
Chemical energy is transferred into 3-PGA molecules.
11
What type of pathway is used in cacti?
CAM
12
Where is glucose made in plants?
Cytoplasm
13
What happens when aerobic organisms are placed in anaerobic environment? Why?
The Krebs cycle stops and fermentation begins. The Krebs cycle stops because the ETC shuts down.
14
The Krebs cycle is also known as the ___________ cycle
Citric acid
15
What organisms perform alcoholic fermentation?
Yeast
16
What is the movement of protons during ATP production?
Chemiosmosis
17
What is the final receptor of electrons in photosystem one?
Ferrodoxin
18
What is the yellow and orange pigment in leaves?
Carotenoids
19
Essay: compare and contrast photosynthesis and cellular respiration.
Photosynthesis is an anabolic pathway. During this process light energy from the sun is converted to chemical energy. Cellular respiration is a catabolic pathway. In this process, organic molecules are broken down to release energy. Both processes go through electron transport. They are two important processes that cells use to obtain energy.
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