Which type of plant hormone is primarily responsible for helping break the dormancy of seeds and
buds?
a. gibberellins
b. cytokinins
c. ethylene
d. auxins
e. jasmonates
A
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Put the steps of the process of signal transduction in the order they occur:
1. A conformational change in the signal-receptor complex activates an enzyme. 2. Protein kinases are activated. 3. A signal molecule binds to a receptor. 4. Target proteins are phosphorylated. 5. Second messenger molecules are released. A) 1, 2, 3, 4, 5 B) 3, 1, 2, 4, 5 C) 3, 1, 5, 2, 4 D) 1, 2, 5, 3, 4
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 Angel Oak on Johns Island, South Carolina is estimated to be up to ____ years old
a. 300 b. 1000 c. 1400 d. 2000 e. 2400
All of the following are functions of the lymphatic system EXCEPT
A. production, maintenance, and distribution of lymphocytes. B. defending the body against pathogens. C. transporting gases, nutrients, and metabolic wastes to parts of the body which have exchange boundaries with the external environment. D. absorbing excess tissue fluids and returning them to the bloodstream.