Polar covalent bonds:
A. can result in molecules having an electric dipole moment.
B. can result in molecules having separated positive and negative charges.
C. will not be present in nonpolar molecules.
D. occur when the electrons in the bond are shared between the atoms but biased toward one atom in the bond.
E. All of these choices are correct.
E
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What metabolic advantage do cells have in storing the elemental sulfur byproduct from sulfide oxidation?
A) The cells avoid producing transport energy waste to secrete the sulfur. B) The byproduct serves as an electron reserve for subsequent oxidation. C) Sulfur decreases the intracellular acidification for non-acid-tolerant sulfide oxidizers. D) The byproduct can be used for other biosynthetic pathways that use sulfur, such as Rieske Fe-S proteins.
Genetic engineering methods have been used to produce vaccines.
Answer the following statement true (T) or false (F)
The plant cell organelle analogous to the endosome is the
A) provacuole. B) lysosome. C) peroxisome. D) glycoxysome. E) none of the above
Electrophoresis separates proteins on the basis of what factor(s)?
A.) the protein's size B.) the protein's affinity for a ligand molecule C.) the protein's cell of origin D.) the protein's net charge