To remove noncoding sequences in the pre-mRNA of eukaryotes, multiple snRNPs combine with proteins to form a larger complex called the ________.
A. 5' cap
B. ribosome
C. 3' poly-A tail
D. introsome
E. spliceosome
Answer: E
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When a neuron is at rest, _____
a. it is at threshold potential b. gated sodium channels are open c. it holds less sodium than the interstitial fluid d. both it is at threshold potential and it holds less sodium than the interstitial fluid
According to the fossil record, which of the following were the first vertebrates to appear on land?
A. reptiles B. mammals C. fish D. birds E. amphibians
Which of the following do researchers suspect is an important factor in colony collapse disorder (CCD?)
a. Habitat fragmentation caused by land development inhibits a bee’s chance of finding a reproductive partner. b. Long-term exposure to low levels of insecticides impair a plant’s ability to produce nectar that a bee can use. c. Exposure to extremely high levels of herbicides can kill an entire population of plants and the bees that depend on them. d. Herbicides kill the plants that bees pollinate thereby eliminating the source of nectar for a bee. e. Long-term exposure to low levels of insecticides impair a bee’s ability to navigate and communicate.
Which of the following solutions would require the addition of the greatest amount of base to bring the solution to neutral pH?
A) gastric juice at pH 2 B) vinegar at pH 3 C) black coffee at pH 5 D) household bleach at pH 12