Choose the best description of a covalent bond from the choices below.
A. Two water molecules interact due to partial charges on the oxygen and hydrogen atoms.
B. A magnesium donates electrons and forms bonds with two chloride ions.
C. A bond forms between a hydrogen from one molecule and a nitrogen from another molecule.
D. A positive potassium ion forms a bond with a negative chloride ion.
E. A nitrogen atom shares electrons with three hydrogen atoms.
E. A nitrogen atom shares electrons with three hydrogen atoms.
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The five different taste qualities are each located in a separate region of the tongue.
a. true b. false
__________ is a technique that can be used to separate DNA molecules on the basis of their size
a. Separation gradient b. Electrophoresis c. Selective sorting d. Cloning e. PCR
Which statement about the inflammatory response is FALSE?
a. Histamine causes increased capillary permeability. b. Type I interferons and neutrophils secrete histamine. c. Increased blood flow to infected areas brings more phagocytic cells. d. Swelling results from an increase in the volume of interstitial fluid in the infected area. e. Edema and certain enzymes in the plasma cause the pain associated with inflammation
Insulin is synthesized in (A)____, and reduces (B)____ levels in the bloodstream by enhancing (C)_______ dependent glucose influx.
a. (A) ? cells (liver) (B) fatty acid (C) Glut4 b. (A) ? cells (pancreas) (B) glucose (C) Glut4 c. (A) ? cell (liver) (B) fatty acid (C) Glucocorticoid d. (A) ? cell (pancreas) (B) glucose (C) Glucocorticoid