Your muscle cells are able to express a different complement of proteins from your brain cells because
a. they contain different genes.
b. muscles and brains are the vestiges of different symbiotic organisms present in our ancestors.
c. you inherit the genes for your muscles from your father and the genes for your brain from your mother.
d. the expression of muscle-specific genes is regulated by transcription factors not present in brain cells and vice versa.
D
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The phospholipid bilayer in plasma membranes is arranged
1.with the polar heads on the internal and external surfaces.
2.with the polar heads on the internal surfaces only.
3.with the polar heads on the external surfaces only.
4.with the polar heads in the center.
5.with the polar heads distributed randomly.
Choose the correct description for the preceding image
A) The cell is in a hypotonic saline solution. B) Osmotic flow does not occur across the plasma membrane of the cell. C) As the current condition of the cell continues, its plasma membrane may rupture or lyse. D) The cell is in equilibrium with the solution in that as one water molecule moves out of the cell, another moves in to replace it. E) As water moves out of the cell, crenation occurs.
Which of the following is not a function of the endocrine system?
a. Maintenance of blood sugar levels b. Regulation of metabolic activity and H2O and electrolyte balance c. Promotion of growth and development d. Transduction of external stimuli e. Helping the body cope with stressful situations
Which valves are considered semilunar valves?