What muscle tissue contains specialized junctions that allow cells to contract as a unit?
a. skeletal only
b. smooth only
c. cardiac only
d. both skeletal and cardiac
e. both cardiac and smooth
ANSWER: c
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The majority of the water in xylem sap typically
a. is used in capturing light energy. b. becomes part of new plant cells. c. is used to make sugars. d. is stored in older plant cells. e. evaporates into the air.
For a non-polar receptor to enter the nucleus, all that has to happen is that the chaperone falls off the receptor.
a. true b. false
Each of the following is true about plant rosettes except
A) rosettes are localized in the plasma membrane. B) rosettes are cellulose-synthesizing enzyme complexes. C) rosette deposition of cellulose microfibrils is directed by microtubules. D) rosettes move in the plasma membrane to deposit growing cellulose microfibrils. E) rosettes deposit cellulose microfibrils only in the middle lamella.
Poor farming practices, such as plowing land straight up and down a hill, led to the formation of the Providence Canyon in Georgia in a process called _____.
A. root stripping B. soil redistribution C. soil erosion D. leaching E. vesselization