Which of the following statements about "excitable membranes" is correct? (Select all correct choices.)
A. Cells spend a significant amount of energy
to pump Na+ out of muscle cells at rest.
B. The difference in charge across a plasma
membrane is called a membrane potential.
C. Acetylcholine released from a nerve cell
binds to a ligand-gated ion channel at the
plasma membrane of a muscle cell.
D. An excitable membrane at rest has a high
concentration of Cl- ions outside the cell,
which flood into the cell upon the opening of
an ion channel.
A,B,C
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Which of the following Mycoplasma species is associated with individuals who are positive for human immunodeficiency virus (HIV), is capable of invading human cells, and can modulate the immune system?
a. M. pneumoniae b. M. genitalium c. M. hominis d. Mycoplasma fermentans
Fertilization in mammals normally occurs in
the a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle
Inherited changes in gene expression that are not the result of changes to the gene sequence itself are known as ________ changes
Fill in the blank with correct word.
The process illustrated in the accompanying figure is called:
a. peristalsis.
b. hydrolysis.
c. emulsification.
d. proteolysis.
e. diffusion.