#Question id: 416
#Unit 1. Molecules and their Interaction Relevant to Biology
The immediate precursors of DNA and RNA synthesis in the cell all contain:
#Question id: 19311
#Unit 4. Cell Communication and Cell Signaling
#Question id: 2203
#Unit 2. Cellular Organization
Parietal cells acidify the stomach contents while maintaining a neutral cytosolic pH by:
a. exporting “excess” cytosolic OH– as HCO3–.
b. exchanging HCO3– for Cl–.
c. preserving electroneutrality by accompanying the movement of each Cl– ion into the stomach lumen by a K+.
d. the excess K+ ions pumped inward by the H+/K+ ATPase are returned to the stomach lumen, thus maintaining the normal intracellular K+ concentration.
Which of the following combination is correct?
#Question id: 28905
#Unit 4. Cell Communication and Cell Signaling
Non-canonical Wnt signaling is initiated by____
#Question id: 29049
#Unit 10. Ecological Principles