In humans, the thirst center is located in the ____.
A. adrenal cortex
B. hypothalamus
C. anterior pituitary
D. pons
E. thymus
Answer: B
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Which of the following statements about the 5?cap and mRNA processing is TRUE?
A. The addition of a 5? cap to mRNA occurs while the pre-mRNA is being made. B. The 5' cap causes the mRNA to be rapidly degraded. C. The 5' cap prevents the exit of mRNA from the nucleus. D. The 5? cap is added to the pre-mRNA by splicesomes. E. The 5? cap is a group of adenosine molecules.
Scientists hypothesize that the massive Permian extinction was triggered by an asteroid impact
a. True b. False
Select the three layers of the human eye.
a. sclera b. choroid c. retina d. all of the above
The separation of the Archaebacteria into a separate domain indicates
A) that these organisms are very different from eubacteria and from eukarys B) that organisms should never be classified according to how they appear (morphological characteristics) C) that early taxonomists rushed to classify them without closely examining them D) that optical viewing techniques have greatly improved so that we can better view these microorganisms E) none of the above