The primary germ layers include all of following EXCEPT
a. endoderm
b. ectoderm
c. mesoderm
d. morphogerm
e. all of the above ARE primary germ layers
D
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Moderate temperatures and precipitation, as well as nutrient-rich soil due to annual leaf fall, characterize this biome
A. temperate Grassland B. temperate Coniferous forest C. taiga D. savannah E. deciduous forest
Plant cells release hydrogen ions and oxygen from H2O molecules in ____
a. photosystem I b. photosystem II c. cyclic photophosphorylation d. the light independent reaction e. carbon fixation
How do protein kinases generally activate their target proteins?
A) The process of phosphorylation causes the target proteins to change conformation. B) The kinases bind to target proteins directly, forming a complex that activates the proteins and lets them change conformation. C) Kinase concentrations vary during the cell cycle, so that proteins are activated only when kinase levels are high. D) Kinases bind to target proteins and inactivate them, so kinase levels must drop for target protein activation. E) The process of dephosphorylation causes the target proteins to change conformation.
What is the ultimate source of variability in offspring?
a. Okazaki fragments b. DNA repairs c. nucleosomes d. mutations