__________ occurs in different patterns depending on the species and selection pressures. Fill in the blank(s) with the appropriate word(s)
Natural selection
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Activation of the IFN-? globin promoter is an example of a histone code. Of the steps given, which is the third in this process?
A. The TATA box in the promoter is exposed. B. Complexes containing Gcn5 bind to the promoter and acetylate nearby nucleosomes. C. A chromatin remodeling complex such as SW1/SNF binds to and moves the nucleosome. D. Initiation of transcription occurs. E. A protein kinase binds to the Gcn5 complex and phosphorylates nearby nucleosomes.
Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. In sexual reproduction, an alga simply releases gametes into the water, and the current carries the sex cells to another individual. What adaptation did plants have to make in reproduction when they moved to dry land?
a. Development of stomata b. Development of vascular tissue c. Production of a cuticle d. Production of pollen e. Production of lignin
Which local regulator is stored in cells of the immune system and released during an allergic reaction?
a. histamine b. nitric oxide c. a growth factor d. a prostaglandin e. a neurotransmitter
Though it is a continuous process, list the five stages of mitosis in the sequence they are described in for convenience, starting with prophase
a. Prophase b. Prometaphase c. Metaphase d. Anaphase e. Telophase