A regulatory gene codes for a protein that activates the genes in an operon.
Indicate whether the statement is true or false.
Answer: False
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The blood-brain barrier consists of
a. membranes surrounding the neurons of the brain. b. cells lining the wall of the brain capillaries. c. vesicles of cerebrospinal fluid. d. the cerebral cortex. e. the meninges.
On average, how many red blood cells are there in a microliter of blood?
a. 5,000 b. 50,000 c. 500,000 d. 5,000,000 e. 50,000,000
According to Kluyver and van Niel, which of the following are TRUE of basic biochemical reactions?
A) They are shared by all living things. B) There are an unlimited number of them. C) They primarily involve the transfer of electrons and ions. D) Basic biochemical reactions shared by all living things primarily involve transfer of electrons and hydrogen ions. E) They primarily involve transfers of chemical groups.
Sodium ions are single atoms. Why can't they simply diffuse through the cell membrane's lipid bilayer?
A. Chelator proteins capture any ions that start to cross the bilayer. B. Since they are charged, ions can't cross the hydrophobic center of the membrane without a channel or pump. C. Ions do traverse the membrane easily, but the sodium-potassium pump moves them back across. D. Sodium ions are covalently attached in groups of three, which are too large to diffuse easily.