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

Biology & Microbiology

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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.

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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.

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Primitive feathers in certain dinosaurs evolved in anticipation of flight in their descendants, the birds

Indicate whether the statement is true or false.

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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?

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