For both actin and microtubule polymerization, nucleotide hydrolysis is important for ______
(a) stabilizing the filaments once they are formed.
(b) increasing the rate at which subunits are added to the filaments.
(c) promoting nucleation of filaments.
(d) decreasing the binding strength between subunits on filaments.
(d) ATP hydrolysis in actin polymerization decreases the binding strength between monomers in the actin filaments; GTP hydrolysis during tubulin polymerization decreases the binding strength between the tubulin subunits in the microtubule.
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In order to speed up the sterilization process, which of the following would be useful?
A. Drying the material B. Washing/mechanical removal of bacteria/organic matter C. Addition of organics D. Nothing E. Washing/mechanical removal of bacteria/organic matter AND addition of organics
Which metabolite of alcohol is most toxic?
a. alcohol dehydrogenase b. ethanol c. acetaldehyde d. acetate e. carbon dioxide
Which time period of Earth represents when evolution was progressing at the most rapid rate, as evidenced by fossils
such as those of the Burgess Shale? a. Silurian period b. Cambrian period c. Devonian period d. Ordovician period e. Carboniferous period
Closely related plant species, found in the same geographical location, can attract different pollinators. This type of reproductive isolation is an example of