Why do cigarette smokers cough more than most people do?
A) The tar in cigarette smoke tends to make alveoli stick closed. Coughing opens them.
B) Coughing is the respiratory system's attempt to clear itself of the thick mucus that is produced in response to smoke exposure.
C) Cigarette smoking partially paralyzes the lungs; coughing exchanges the resultant "dead air."
D) Coughing stimulates blood flow to the lungs.
B
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Which of the following does not belong?
a. phospholipids b. polysaccharides c. unsaturated fats d. steroids e. saturated fats
The pre-digestive organ listed above “C” is called
the a. mouth. b. crop. c. gizzard. d. secreting portion of stomach. e. cloaca.
Carbon dioxide concentrations fluctuate in predictable seasonal patterns on the surface of the planet largely as a result of
A) the influence of vegetation patterns in tropical systems. B) weathering of rock surfaces following seasonal rain events. C) vegetation growth and flux patterns in aquatic systems. D) large-scale patterns of terrestrial plant uptake and dormancy.
You are studying two linked genes that influence vine height and fruit color in squash. Yellow color is dominant over green, and tall height is dominant over short. You get the following numbers of offspring from your testcross: 198 Tall Yellow, 192 Short Green, 54 Tall Green, and 56 Short Yellow Which offspring are recombinants?
a. Tall green b. Short yellow c. Tall yellow and short green d. Tall green and short yellow