What is a hallmark of passive transport across cell membranes?
a. It requires the use of ATP.
b. It occurs along an electrochemical gradient.
c. It cannot occur without assistance from an integral membrane protein.
d. It occurs along an electrochemical gradient, and may involve the use of transport proteins.
e. It may involve the use of transport proteins.
Answer: d. It occurs along an electrochemical gradient, and may involve the use of transport proteins.
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Which two cell scientists are credited with the formulation of the cell theory, also known as the cell doctrine?
A. Watson and Crick B. Schleiden and Schwann C. Schleiden and Hooke D. Schwann and Jenner
Yeast is used to produce beer and wine but can also make bread rise. All of these processes involve the production of alcohol. Explain why you can eat bread and not get drunk
A) The heat of cooking bakes out the alcohol. B) The amount of alcohol produced is too small to be noticeable. C) The bread-making process produces ethyl alcohol, not isopropyl alcohol. D) The bread-making process produces isopropyl alcohol, not ethyl alcohol.
Tight junctions are composed of networks of all of the following except
a. claudin. b. occludin. c. junctional adhesion molecules. d. integrin.
In the electromagnetic spectrum, the type of radiation that we call visible light occurs between __________.
A. UV radiation and infrared radiation B. radio waves and microwaves C. infrared radiation and microwaves D. X-rays and UV radiation