Which of the following is able to passively penetrate the plasma membrane (without a transport protein)?
A. Large polar molecules
B. Small charged particles
C. O2
D. All of the choices are correct.
Answer: C. O2
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The soft palate ends at the _____, a structure that's function is to keep food out of the nasal cavity.
Fill in the blank(s) with the appropriate word(s).
The hydrolysis of ATP yields ADP, phosphate ion, and
A) AMP. B) H2O. C) energy. D) adenosine. E) nuclease.
Which of the following is CORRECTLY matched with its function?
A. peripheral proteins - penetrate the lipid bilayer from one surface to the other B. nongated ion channels - are always closed C. receptor proteins - attach to ligand molecules D. channel proteins - are part of an intercellular communication system E. marker molecules - are primarily steroids
Ovarian estrogen production decreases during climacteric
Indicate whether the statement is true or false