How is the intron splicing process related to the transport of mRNA from the nucleus to the cytoplasm?
What will be an ideal response?
Ans: During the splicing process, a complex of proteins called the exon junction complex (EJC) attaches to the mRNA and remains there after splicing is complete. The EJC includes REF proteins that bind transport factors, facilitating export of the mRNA.
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Which of the following is a component of the spore—or zygote—wall (in mosses, ferns, gymnosperms, and angiosperms) and helps prevent the desiccation of these structures?
A. sporangium B. sporopollenin C. chitin D. peptidoglycan E. sporangia
Which of the following sets of terms belong together?
A. involuntary, autonomic, sympathetic B. voluntary, autonomic, parasympathetic C. involuntary, somatic, parasympathetic D. voluntary, somatic, sympathetic
Mutations are a source of genetic ________ by which evolutionary change is possible
A) reproduction B) constancy C) stability D) variability
As part of your research project, you travel to an island to learn more about the habitats and relationships of spiders, centipedes, and insects. You and your assistant plot out five different areas of the island and count the numbers of spiders, centipedes, and insects living in each plot. Your results show the following: Plot Insects Spiders Centipedes1300254242617103147152147397805791393The most plausible explanation for the high number of spiders in plot 4 is:
A. The flies and spiders worked together to eliminate the centipedes. B. There are no centipedes to prey on the spiders and there are abundant flies upon which to feed. C. There are too many flies overall. D. The spiders preyed on the centipedes and ignored the flies.