The formula for methane gas is CH4. What does the formula 4CH4 represent?
A) a molecule with 4 carbon atoms
B) a molecule with 4 carbon atoms and 16 hydrogen atoms
C) 4 molecules, each containing a carbon and a hydrogen atom
D) 4 molecules, each containing a carbon atom and 4 hydrogen atoms
E) an inorganic compound with ionic bonds
D
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The blood-brain barrier
a. consists of both anatomical and physiological factors. b. regulates to some extent the passage of substances from the blood to the interstitial fluid of the brain. c. is anatomically related to the formation of tight junctions between adjacent capillary endothelial cells. d. is induced by the astrocytes. e. all of these.
Gonadotropins include FSH and LH
Indicate whether the statement is true or false
The Na+/K+ pump transports ________ into the cell and ________ out of the cell per cycle.
A. 3K+; 2Na+ B. 3Na+; 2K+ C. 2Na+; 3K+ D. 2K+; 3Na+
The dens (odontoid process) is a feature of which of the following bones?
A. Occipital bone B. Mandible C. First cervical vertebra D. Second cervical vertebra E. Temporal bone