Sodium ions are single atoms. Why can't they simply diffuse through the cell membrane's lipid bilayer?
A. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump.
B. Sodium ions are covalently attached in groups of three, which are too large to diffuse easily.
C. Ions do traverse the membrane easily, but the sodium-potassium pump moves them back across.
D. Chelator proteins capture any ions that start to cross the bilayer.
A. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump.
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The lipids in the cytoplasmic membrane of Bacteria and ________ contain ester linkages, while the cytoplasmic membrane of ________ contain ether linkages
A) Archaea / Eukarya B) Archaea / fungi C) Eukarya / prokaryotes D) Eukarya / Archaea
The genome of most plant viruses consists of what kind of RNA?
a. rRNA b. mRNA c. ssRNA d. dsRNA e. SRP RNA
Which structure in the accompanying figure represents the nitrogenous waste urea?
a. 1
b. 2
c. 3
d. 4
The phase of a population growth curve that comes after the lag phase is the
A. stable equilibrium phase. B. deceleration phase. C. exponential growth phase. D. death phase.