Why is it difficult for protons (H+) to move across phospholipid bilayer membranes?
A. Protons are too hydrophobic to pass through membranes.
B. Protons are too large to pass through the membrane.
C. There are no proteins in membranes to allow protons through.
D. The positive charge on protons prevents them from passing through the hydrophobic interior of membranes.
D. The positive charge on protons prevents them from passing through the hydrophobic interior of membranes.
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Pheromones are ____ signals
a. tactile b. electrical c. acoustical d. visual e. chemical
What are the sizes of two subunits used to compose prokaryotic ribosomes?
a) 20S + 50S b) 30S + 40S c) 30S + 50S d) 40S + 60S
Lipids are recognized as a group because they ________
a. are all formed from the same basic monomer, cholesterol b. contain a unique bond, the peptide bond, between adjacent monomers c. do not dissolve in water d. are the only biological molecules that are susceptible to hydrolysis
In a given geographic location, the combination of all living organisms plus the physical environment in which they live is termed a(n) ________
Fill in the blank(s) with correct word