Why can't many molecules, like sugar and proteins, pass freely across the lipid bilayer of plasma membranes?
What will be an ideal response?
Because these molecules are polar and are repelled by the fatty acid interior of the phospholipid bilayer.
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When a vesicle forms around a small, randomly chosen volume of extracellular fluid, this is termed ________
a. phagocytosis b. exocytosis c. receptor-mediated endocytosis d. bulk-phase endocytosis
An organism at the second trophic level is indicated
by a. A. b. B. c. C. d. D. e. E.
The first bioengineered organisms were ____
a. Viruses b. Fungi c. Protozoans d. plant cells e. Bacteria
The ventricles are
a. the upper chambers of the heart b. the chambers of the heart that pump blood to the lungs and the rest of the body c. the chambers of the heart that receive blood from the lungs and the rest of the body d. lower chambers of the heart that contract separately