In the fluid mosaic model of a typical plasma
membrane, what accounts for the fluidity?
a. the proteins, being large, cause the
membrane to jiggle around.
b. the phospholipids collectively form a jellylike
substance similar to the cytoplasm.
c. the phospholipids are not bonded to each
other and thus are more free to move
around.
d. water molecules infiltrate the bilayer
causing it to become more watery and thus
more fluid.
e. the phospholipids in a typical plasma membrane form covalent bonds which are
elastic and allow the membrane to ‘stretch’.
C
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Thorough mixing of oxygen and nutrients within
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Recombinant DNA technology can be used to make which of the following?
A)Vaccines B)Human hormones C)Drugs D) all of the above
The fleshy extension of the soft palate is known as the
A. pharynx. B. adenoid. C. uvula. D. epiglottis. E. cecum.
Which of the following methods of enumerating cells is the only one to detect live cells?
A. direct microscopic count B. viable plate count C. turbidity D. coulter counter E. flow cytometer