science: chpt. 8 test Flashcards
(21 cards)
How many carbon dioxide are involved in the first step of the Calvin cycle?
Six
Is light used in light-dependent or light-independent reactions?
Light-dependent
What happens to some of the energy in photosynthesis?
It is converted to heat
An organism that uses hydrogen sulfide as its primary energy source is…
Chemoautotrophs
Is photosynthesis anabolic or catabolic? Why?
Anabolic, because it builds substances
Which one of these converts chemical energy to mechanical energy?
– Photosynthesis
– Cellular respiration
– Muscle contractions
Muscle contractions
How many “turns” of Kreb’s cycle does it take to break down glucose?
Two
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.
True/False – C4 plants keep their stomata closed during hot days.
True, because they are holding on to the water
Why are leaves green except during autumn?
Because chlorophyll is the most abundant.
What happens in the second step of the Calvin cycle?
Chemical energy is transferred into 3-PGA molecules.
What type of pathway is used in cacti?
CAM
Where is glucose made in plants?
Cytoplasm
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.
The Krebs cycle is also known as the ___________ cycle
Citric acid
What organisms perform alcoholic fermentation?
Yeast
What is the movement of protons during ATP production?
Chemiosmosis
What is the final receptor of electrons in photosystem one?
Ferrodoxin
What is the yellow and orange pigment in leaves?
Carotenoids
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.
What energy molecules are produced in the thylakoids?
ATP & NADPH
