Which are likely involved in promoting cell differentiation during animal development?
A. differential distribution of cytosolic factors among early embryonic cells
B. extracellular signals
C. cellular receptors
D. specific morphogens
E. All of the choices are correct
E. All of the choices are correct
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The oxygen consumed during cellular respiration is involved directly in which process or event?
A) glycolysis B) accepting electrons at the end of the electron transport chain C) the citric acid cycle D) the oxidation of pyruvate to acetyl CoA E) the phosphorylation of ADP to form ATP
You are doing research on rodent populations in a cornfield at night and are hearing popping noises. Your research assistant is getting scared. Having taken biology, you can explain to your assistant that the popping sound is due to
A. the apical meristem cells in the corn stalks elongating. B. the developing of the kernels of corn on the ears of the corn stalks. C. the expansion of the lateral meristems increasing the girth of the corn stalk. D. the growth of the intercalary meristems inside the corn stalk. E. the development of the tassels on top of the corn stalk.
Which cells serve as electrical insulators in the central nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. efferent neurons e. afferent neurons
A hypothesis refers to a(n)
A) phenomenon that is observed but is not yet understood. B) testable explanation for an observed phenomenon. C) untestable explanation for an observed phenomenon. D) falsified explanation for an observed phenomenon.