Enzymes work by _____.
a) lowering the activation energy of a reaction and thus speeding up the reaction
b) changing the free energy of a reaction and thus speeding up the reaction
c) raising the activation energy of a reaction and thus speeding up the reaction
d) lowering the delta G of a reaction and thus speeding up the reaction
e) raising the delta g of a reaction and thus speeding up the reaction
Ans: a) lowering the activation energy of a reaction and thus speeding up the reaction
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Fossils and molecular techniques reveal that the closest ancient wolflike relatives of most modern dogs lived in ____
a. Asia b. Africa c. South America d. North America e. Europe
The classification system includes the domain Archaea. What characteristic would NOT be found in an organism in this domain?
A) a cell membrane B) a set of genetic instructions C) a nucleus D) a cell wall
________ can behave as an enzyme and may have been the first macromolecule leading to the first cells
Fill in the blank(s) with correct word
Which microscope takes advantage of differences in the refractive indexes of cell structures?
A) compound light microscope B) phase-contrast microscope C) darkfield microscope D) fluorescence microscope E) electron microscope