A solution is at equilibrium across a plasma membrane. If 50 molecules were to enter the cell, how many molecules would need to exit the cell in order to maintain the equilibrium?
A. 50
B. 100
C. 75
D. 25
E. 0
Answer: A
You might also like to view...
Nicotine from cigarette smoke acts as a ligand and associates with specific proteins on the surface cells in the brain, causing feelings of pleasure and well-being. Below are the events that happen in the cellular response to nicotine
Place the events in the correct order to describe the five basic steps in the pathway of a signal transduction system. A. receptor binding B. receptor activation C. signal transduction D. response E. termination The opening of an ion channel as a result of nicotine association is an example of _________________. ________________ occurs when an influx of ions causes an action potential, which carries the signal to the reward areas of the brain. Nicotine interaction with the transmembrane protein that normally binds the neurotransmitter acetylcholine is an example of _________________. ________________ occurs when the signal causes release of dopamine in the brain, which causes relaxation and feelings of well-being. Rapid elimination of nicotine from the body is an example of ____________. What will be an ideal response?
In which one of the following ways do prokaryotic cells differ from eukaryotic cells?
A) Prokaryotic cells have a plasma membrane composed entirely of protein. B) Prokaryotic cells lack a membrane-bound nucleus and other membranous organelles. C) Prokaryotic cells lack DNA, RNA, and ribosomes. D) Prokaryotic cells have cytoplasm that is bounded by a cell membrane. E) Prokaryotic cells have cytoplasm but lack a cell membrane.
Suppose a plant has a unique photosynthetic pigment and the leaves of this plant appear to be reddish yellow. What wavelengths of visible light are absorbed by this pigment?
A) red and yellow B) blue and violet C) green and yellow D) blue, green, and red
What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?
A) 4.5x B) 10x C) 45x D) 100x E) 450x