While characterizing a new tyrosine phosphatase, researchers found that with the total concentration [Et] of phosphatase at 50 nM, Vmax = 20 µM s-1 . What is the turnover number (kcat) for this phosphatase?
A. 40 M s-1
B. 400 M s-1
C. 4 s-1
D. 40 s-1
E. 400 s-1
E
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The transport of what molecules or particles across the thylakoid membrane power the production of ATP?
a. electrons b. hydrogen ions c. oxygen d. carbon dioxide e. phosphate ions
The label "1" in the accompanying figure represents ________
A) the "root" for the tree B) the common ancestor for the hypothetical lineage C) both A and B D) None of the above.
A cell in G0 state ____
a. is actively growing before cell division begins b. has a cleavage furrow and the cytoplasm is beginning to divide c. is actively replicating chromosomes d. is in cytokinesis e. has entered a resting stage and is not actively dividing
The accompanying figure is a photomicrograph of ____.?
a. a nucleus
b. a Golgi body
c. endoplasmic reticulum
d. a vacuole
e. a nucleoid