About _____ of lung cancers occur in smokers.
A. 20 percent
B. 40 percent
C. 60 percent
D. 80 percent
E. 1000 percent
Answer: D
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Answer the question using the accompanying figure. What is occurring in step 11?
a. cytoplasmic division b. fusion c. fertilization d. the first meiotic division e. the second meiotic division
In terms of regulation of gene expression, tryptophan and allolactose are examples of ________ molecules
A) repressor B) effector C) inducer D) operator E) terminator
During the embryonic stage, a hollow ball of cells is known as a
A) morula. B) larva. C) blastula. D) gastrula. E) chorion.
Among mammals, it is generally true that _____
A) all types of foods begin their enzymatic digestion in the mouth B) after leaving the oral cavity, the bolus enters the larynx C) the epiglottis prevents swallowed food from entering the trachea D) the trachea leads to the esophagus and then to the stomach