Although Gregor Mendel knew nothing of chromosomes, mitosis, or meiosis, we now know that his Principle of Segregation corresponds to the events of _____
1.meiosis I
2.meiosis II
3.mitosis
4.both meiosis and mitosis
5.neither meiosis nor mitosis
1
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One factor that seems to aid in maintaining lipid stability in hyperthermophilic Archaea is that dibiphytanyl tetraether lipids form a(n)
A) covalently bonded monolayer cytoplasmic membrane. B) interlocking bilayer cytoplasmic membrane. C) interlocking lattice with the cell wall. D) pseudomembrane immediately inside the cytoplasmic membrane.
Cytotoxic T cells destroy target cells by
A. the CD95 pathway. B. the perforin pathway. C. direct killing mediated by activated oxygen species. D. both direct killing mediated by activated oxygen species and the perforin pathway. E. both the perforin pathway and the CD95 pathway.
While mosses can cover a significant area of land, they are never more than a few centimeters tall. Why do they not grow tall?
A) They have no vascular system, so they cannot transport water over long distances. B) They are annuals and simply don't live long enough to get very tall. C) They don't get enough sunlight to grow tall. D) Herbivores constantly eat them to the ground.
What might be the predominant lifestyle on Earth?
A. parasitism B. mutualism C. predation D. commensalism E. herbivory