One major difference between prokaryotic and eukaryotic genes is that eukaryotic genes can contain internal sequences, called ________, that get removed in the mature message
Fill in the blank(s) with correct word
intervening sequences, or introns
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Outline the three levels of defense of humans against the invasion of pathogens
What will be an ideal response?
The discovery of the fossilized remains of Archaeopteryx in 1860 set forth the hypothesis of birds being closely related to
A. dinosaurs. B. salamanders. C. bats. D. butterflies. E. bees.
Which is false about estrogen receptors in humans?
a. They are restricted to females. b. They are necessary for sperm maturation. c. They bind the insecticides kepone and DDT, now banned in the U.S. d. Endocrine disruptors affecting them may be responsible for declining sperm counts in western countries. e. All of these are false.
The rotation of Earth on its axis is the driving force behind the water cycle
Indicate whether the statement is true or false