Which is the "good" cholesterol?
A) VLDL B) LDL C) HDL D) VHDL
C
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When receptors coupled to phospholipase C are activated, calcium levels in the cytosol increase when ______
A. diacylglycerol binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. B. IP3 binds to ligand-gated channels on the plasma membrane, releasing calcium. C. diacylglycerol binds to ligand-gated channels on the plasma membrane, releasing calcium. D. IP3 binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. E. phospholipase C phosphorylates the receptor leading to calcium production.
Answer the following statement(s) true (T) or false (F)
1. An application of too much fertilizer will negatively affect the movement of materials in the phloem. 2. A decrease in the availability of ATP in a root cell could decrease the water potential of the cell. 3. If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel. 4. An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata. 5. If the proton pumps of guard cell were damaged, transpiration would decrease.
The most common mutation in cystic fibrosis is the deletion of a single amino acid which results in a misfolded
protein. a. True b. False
Which of the following organisms is a prokaryote?
A. algae B. archaea C. fungus D. protozoa E. both archaea and protozoa