Critical concentration is
A) the concentration of tubulin dimers at which assembly is balanced with disassembly.
B) the concentration of tubulin dimers at which assembly occurs primarily.
C) the concentration of G-actin in most muscle cells.
D) required before nucleation can occur.
E) both choices A and D
A) the concentration of tubulin dimers at which assembly is balanced with disassembly.
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In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. leads to release of a second messenger that ultimately results in hydrolysis of glycogen to glucose b. leads to release of a second messenger that lowers blood glucose by causing it to bind to liver cells c. interacts directly with the enzyme glycogen phosphorylase d. interacts directly with the cell membrane to help transport glucose into the cell e. is a signaling molecule that does not require a cell surface receptor
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A. having products with lower energy than the reactants. B. yielding smaller product molecules than the original reactants. C. often having higher energy in product molecules than the reactants, and yielding larger product molecules. D. having products with higher energy than the reactants. E. yielding larger product molecules than the original reactants.
Coccolithophorids are marine members of the brown algae
________________ Indicate whether the statement is true or false.