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Protein and Amino Acid Metabolism › ViewWhat is the role of the citric acid cycle in amino acid metabolism?
A. Converts urea to ammonia for absorption
B. Converts glucose to amino acids for storage
C. Converts ammonia to urea for excretion
D. Converts amino acids to keto acids for energy
Nervous System and Special Senses › View
Which one of the following is the correct sequence of events that follows a threshold potential:
1. the membrane becomes depolarized
2. sodium channels open and sodium ions diffuse inward
3. the membrane becomes repolarized
4. potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
.
A. 3,2,4,1
B. 2,1,4,3
C. 2,1,3,4
D. 1,2,4,3