The exchange of gases between the lungs and the blood occurs by
A. filtration.
B. osmosis.
C. active transport.
D. diffusion.
E. ionic bonding.
Answer: D
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A cellular junction is: (1) the space between two cells; (2) the point of contact between two cells; (3) the point of contact between a cell and the extracellular matrix
A. Statements (1) and (2) are correct. B. Statements (2) and (3) are correct. C. Statements (1) and (3) are correct. D. All the statements are correct.
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period.
A collapsed lung occurs when the pressure in the ____
a. atmosphere increases b. alveoli increases c. pleural cavity increases d. trachea increases e. bronchioles decreases
Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose. The aldehyde is used when glucose and fructose bind together to form sucrose, and the Benedict's test is negative. Starch contains a great deal of glucose but gives a negative Benedict's test because:
A. all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent. B. starch is not soluble in water and cannot react with Benedict's reagent. C. only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent. D. glucose in starch has lost a carbon atom and cannot react with Benedict's reagent.