The permeability of the plasma membrane to mineral ions:
A. is not influenced by channels formed by proteins.
B. is the same in all cell types.
C. is affected by differences in electrical charge on the two sides of the membrane.
D. is zero in all living cells.
E. is only possible because of the hydrophobic interior of the lipid bilayer.
C
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You are a student intern in the research and development department of a pharmaceutical company. You have discovered a compound that destroys the common cold virus in cultured human cells. Chemical characterization reveals that carbon, hydrogen, and oxygen are present, in a 20:40:4 ratio of C:H:O. What chemical class is this compound? Experiments in rats show that neither oral nor injectable
treatment with the compound was effective in destroying the virus. Discuss some possible reasons for this lack of effectiveness. What will be an ideal response?
In this experiment, optical density is measured using a _______.
A) spectrophotometer B) thermocycler C) microscope D) caliper
Photoreceptors contain the enzyme to re-isomerize the all-trans retinal back to the 11-cis form.
Answer the following statement true (T) or false (F)
What is the reflexive movement of both eyes medially to view objects close to us?
A) emmetropia B) convergence C) accommodation D) inversion