Two very important second messengers used in the G protein-linked receptor mechanism are cyclic AMP and ________.
Fill in the blank(s) with the appropriate word(s).
ionic calcium
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Which of the following factors influence cell membrane permeability?
A. Phospholipid composition of the membrane B. Ionic charge along the membrane C. Presence or absence of transport proteins D. Molecule size E. All of the choices are correct.
The most common and most numerous plastid in a plant cell is the ____________________
Fill in the blank(s) with correct word
Osseous tissue is a(an) ________ tissue.
A. connective B. dense regular C. dense irregular D. reticular E. epithelial
Several research groups are working on vaccines that will be effective against the AIDS virus. When a successful vaccine is produced, it is likely to be injected to produce
A. active natural immunity. B. active artificial immunity. C. passive natural immunity. D. passive artificial immunity. E. active passive immunity.