In a four-chambered heart, which of the
following would have the thickest muscle?
a. right atrium
b. left atrium
c. right ventricle
d. left ventricle
e. both ventricles would have equally thicker
muscle than the atria
D
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Jean-Luc Eiselé and his coworkers used ______ receptors in their research on neurotransmitter
receptor function.
a. African clawed frog b. toad c. artificial d. dog e. human
According to pressure-flow theory, how does sap move from the sieve tube into a sink?
A. a positive pump pressure B. osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes C. a negative pump pressure D. gravitational action as phloem moves down from the source E. active membrane transport through the plasma membranes
What molecule could move across a plasma membrane the easiest?
What will be an ideal response?
An atom or molecule becomes a(n) (anion/ion/cation) when it loses an electron to a more electronegative molecule.
Fill in the blank(s) with the appropriate word(s).