What is the function of karyopherins?
a. They attach to chromosomes in order to activate heterochromatin.
b. They coat chromosomes.
c. They define the structure of Cajal bodies.
d. They transport macromolecules into or out of the nucleus.
Ans: a. They attach to chromosomes in order to activate heterochromatin.
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Which of the following statements about basidiomycetes and ascomycetes is incorrect?
A. Basidiomycetes have a short heterokaryotic stage, whereas ascomycetes have a long heterokaryotic stage. B. Basidiomycetes produce spores in clubshaped cells, whereas ascomycetes produce spores in elongated, saclike cells. C. Basidiomycetes plug their septal pores following damage in a different way from ascomycetes. D. Basidiomycetes produce four spores from each basidium, whereas ascomycetes produce eight spores from each ascus. E. Basidiomycete fruiting bodies are composed entirely of dikaryotic hyphae, whereas ascomycete fruiting bodies are composed of a combination of haploid and dikaryotic hyphae.
Among animals, oviparity can be found in (select all correct choices):
A. birds. B. reptiles. C. mammals. D. amphibians. E. insects.
In MacArthur and Wilson's island biogeography model, species richness is a balance between
A. arrival and extinction. B. inhibition and facilitation. C. arrival and speciation. D. tolerance and inhibition. E. None of these choices are correct.
The RNA that is translated into a polypeptide is ________ RNA
A) viral B) ribosomal C) transfer D) messenger