Each of the following is classified as a genetic
disorder except _________, which is an abnormality.
a. cystic fibrosis
b. webbed toes
c. hemophilia
d. Down syndrome
e. XYY
Answer: b
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_____ is known as a cardiac pacemaker
a. Diastole b. Systole c. Cardiac muscle d. SA node e. AV node
Species richness is greatest at which latitude?
a. 60 degrees north b. 60 degrees south c. 0 degrees d. 40 degrees north e. 20 degrees south
In which one of the following ways are antiangiogenic drugs used in the treatment of cancer?
A) These drugs stop the replication of DNA, so cancer cells cannot reproduce. B) These drugs stop the growth of blood vessels into the tumor, so the cells "starve" to death. C) These drugs stop metastasis. D) These drugs stimulate the immune system. E) These drugs stimulate the production of free radicals, which kill cancer cells.
The White Cliffs of Dover, England, were formed over millions of years by the accumulation of calcium carbonate shells from ________
Fill in the blank(s) with correct word