Why is the Citric Acid cycle called a cycle?
a. Glucose is cycled around and resynthesized.
b. Carbon dioxide is cycled back to photosynthesis.
c. NAD+ and FAD are recycled.
d. The two-carbon acetic acid binds to a four-carbon molecule that is restored at the end of the cycle to be used again in the Citric Acid cycle.
e. NADH is cycled down the electron transport chain.
Answer: d. The two-carbon acetic acid binds to a four-carbon molecule that is restored at the end of the cycle to be used again in the Citric Acid cycle.
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The process of synthesizing simple sugars using sunlight as an energy source is referred to as
Fill in the blank with the appropriate word.
_____________ results in the oxidation of NH3 to form NO3-, and _______________ relies on the reduction of NO3- to form N2
A. Anammox; nitrogen fixation B. Nitrogen fixation; anammox C. Denitrification; nitrogen fixation D. Nitrification; nitrogen fixation E. Nitrfication; denitrification F. Denitrification; nitrification
The letter “B” in the above figure represents
a. cortex. b. cornea. c. fovea. d. blood vessels. e. optic nerve.
All of the following promote the unloading of oxygen to needy tissues EXCEPT
a. high metabolism. b. abundant oxygen supply. c. higher temperatures. d. lower pH. e. small diameter blood vessels.