Which of these can found in oak wood but not in pine wood?
A. tracheids
B. vessel members
C. ray cells
D. secondary xylem
E. secondary phloem
Answer: B
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During cellular maturation, mammalian erythrocytes lose their
A. nucleus. B. plasma membrane. C. mitochondria. D. hemoglobin. E. None of the answers for this question are correct.
Facilitated diffusion and active transport
A. both transport molecules into or out of a cell. B. are both not very specific as to which molecules are transported. C. both require a concentration gradient to function. D. both require an expenditure of energy in order to transport the molecules. E. both require a concentration gradient to function AND both require an expenditure of energy in order to transport the molecules.
Primitive feathers in certain dinosaurs evolved in anticipation of flight in their descendants, the birds
Indicate whether the statement is true or false.
Assuming that p = 0.3 for a population in Hardy-Weinberg equilibrium, what would be the expected frequency of heterozygotes for the involved allelic pair?
What will be an ideal response?