What enables the splicing of group I and II introns?
A. Spliceosomes
B. Ribozymes
C. snRNA
D. Poly-A tail
B
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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
Climate has been proposed to play a role in the latitudinal diversity gradient. Specifically, some have hypothesized that
A. the warm climate of the tropics promotes high speciation rates. B. the warm climate of the tropics promotes niche diversification. C. relatively few species are able to adapt to the harsher, more variable climates of the high latitudes. D. the harsh, more variable climates of the high latitudes reduce speciation rates. E. none of these
A potent neurtoxin that causes paralytic shellfish poisoning in coastal temperate North America is produced by ________.
A. dinoflagellates B. green algae C. red algae D. diatoms
A general trend in the structure of many biomolecules is
A) that the order and bonding of monomers form the basis for the secondary and tertiary structure of the polymer. B) that they are all soluble in water independent of the size of the polymer. C) that each class of biomolecule forms one type of secondary structure independent of the order of the monomers in the polymer. D) that each class of biomolecule can form either fibrous or globular conformations depending on the chemical conditions inside the cell. E) that four different monomers form the basis for the functional and structural properties of each polymer.