When oxygen is depleted, the citric acid cycle stops. What could we add to the system to restore activity (other than oxygen)?
What will be an ideal response?
Need NAD+ and FAD (both oxidized forms) to proceed.
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What is the direction of sodium ion flow through leak channels in a photoreceptor cell in the dark?
A. from the cytoplasm to the extracellular space B. from the smooth endoplasmic reticulum to the cytosol C. from the extracellular space into the cytoplasm D. from vesicles into the synapse
Water is capable of rising to the tops of the tallest trees due to all of the following except:a
the hydrogen bonds among water molecules. b. the cohesiveness of water molecules. c. the adhesion of water to the walls of xylem cells. d. the evaporative pull of transpiration. e. root pressure
Bacteriophages attach to the cell walls of bacteria by envelope proteins
____________________ Indicate whether the statement is true or false.
Which of the following statements about phospholipids is TRUE?
A) Each one has two fatty acid chains and the glycerol backbone is bonded to a small polar group B) the glycerol backbone is bonded to a small nonpolar group C) Each one has three fatty acid chains D) Their biological function remains unknown