In which disorder is the neural control of the breathing cycle disrupted?
a. emphysema
b. asthma
c. lung cancer
d. bronchitis
e. apnea
ANSWER: e
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Thymine dimers
A. form when DNA is exposed to carcinogens such as tobacco smoke. B. result in abnormal protein structure which causes red blood cells to sickle. C. are rarely removed by DNA repair enzymes. D. form when DNA is exposed to UV radiation.
"Blood is thicker than water" is a true statement since blood contains many components that are more dense than water.
Indicate whether the statement is true or false.
During the spring, newly emerging leaves are sugar ________ and tree roots are sugar ________
A) sources; sources B) sources; sinks C) sinks; sinks D) sinks; sources
Conjugation differs from reproduction because conjugation
A) replicates DNA. B) transfers DNA vertically, to new cells. C) transfers DNA horizontally, to cells in the same generation. D) transcribes DNA to RNA. E) copies RNA to make DNA.