Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?
A) The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer.
B) The plasma membrane is "fluid" because of the movement of substances across the membrane.
C) One of the components of the membrane is water.
D) The membrane is water soluble.
E) The bilayer permits diffusion of certain lipid-soluble substances.
A
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According to the __________, the universe formed about 13 to 15 billion years ago and is still expanding. Fill in the blank(s) with the appropriate word(s)
Antenna complexes, ETCs, and carbon fixation are all found in:
-animal cells. -bacterial cells. -plant cells. -mitochondria. -all of the above
Which of the following statements does not describe a way in which fungi differ from plants?
A. Fungi have nuclear mitosis. B. Fungi have cell walls made of cellulose. C. Fungi have filamentous bodies. D. Fungi have nonmotile sperm. E. Fungi are heterotrophic.
A second messenger
A. activates protein kinases. B. serves to amplify the signal. C. is cyclic AMP. D. All of these are correct.