After processing of pre-mRNAs, the regions that are retained in finished mRNAs are called ____
a. UTRs
b. snRNPs
c. exons
d. domains
e. introns
C
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The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators. This lizard has large feet and flaps of skin along its toes. What properties of water allow this lizard to walk on water?
A. Hydrogen bonds absorb heat when they break and release heat when they form. This helps to minimize temperature changes. B. The surface tension created by hydrogen bonds is greater than the weight of the lizard initially. C. Polar molecules are attracted to ions and polar compounds, making these compounds soluble. D. Hydrogen bonds hold water molecules together; many hydrogen bonds must be broken for water to evaporate.
The lac repressor is
A) active when glucose is present. B) inactive when glucose is present. C) active when both glucose and lactose are present. D) induced when cAMP is present. E) rarely active.
The pancreas produces hormones that regulate
___ homeostasis.
a. water b. temperature c. pH d. glucose e. several types of
The orderly replacement of one community by another is known as:
a. character displacement. b. succession. c. coevolution. d. the edge effect. e. competitive exclusion.