Which of the following normally leads to the production of functional messenger RNA in eukaryotic cells?
(A) A decrease in the rate of ribosome synthesis
(B) The removal of portions of RNA known as intervening sequences (introns)
(C) A decrease in RNA polymerase activity
(D) The replication of new messenger RNA molecules from existing messenger RNA molecules
Ans: (B) The removal of portions of RNA known as intervening sequences (introns)
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You find a new species of worm and want to classify it. Which of the following lines of evidence would allow you to classify the worm as a nematode and not an annelid? A) It undergoes protostome development
A) It undergoes protostome development. B) It is segmented. C) It is triploblastic. D) It has a coelom. E) It sheds its external skeleton to grow.
The reaction diagrammed to the right (more than once answer may apply):
A. is the final reaction of glycolysis. B. is one possible pathway in the fermentation of pyruvate. C. shows synthesis of the substrate that enters the citric acid cycle. D. occurs in the cytosol. E. occurs in the mitochondrial matrix. F. occurs twice for each glucose oxidized.
The thermocline prevents ____ the top layer of the limnetic zone and the deep profundal zone
a. plankton growth in b. vertical mixing between c. autumn overturn in d. photosynthesis in e. detritus formation in
Answer questions 62–66 in reference to the five nucleotides
listed below:a. guanine b. cytosine c. pyrimidine d. thymine e. uracil M 62. Erwin Chargaff’s data indicates that within a species the amount of adenine is always equal to the amount of this. E 63. This nucleotide is not incorporated into the structure of the DNA helix. D 64. This nucleotide is a double-ring molecule. M 65. If one chain of a DNA molecule has a purine at a given position, this complements it on the other chain. D 66. Two hydrogen bonds connect adenine to __________ in the DNA molecule.