Which of the following statements about the umbilical cord is false?
A. It contains blood vessels from the embryo
B. It contains blood vessels from the mother
C. It is derived from the allantois
D. It joins the placenta and the embryo
E. It carries nutrients and wastes
Ans: B. It contains blood vessels from the mother
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Which of the following is an example of Müllerian mimicry?
A) walking sticks that resemble twigs B) stinkbugs that produce a noxious odor C) flounders whose colors resemble the sea floor D) wasps with black and yellow bands
Natural communities recycle nutrients, but cultivated communities often require an input of mineral nutrients due to losses through
A. erosion. B. iron accumulation. C. humus. D. crop rotation. E. nitrogen fixation.
A scientist discovers an unidentified organism that is composed of multiple cells and has a membrane-bound nucleus. Of the choices listed, the most likely classification would be ________
A) Bacteria B) Archaea C) fungi D) Any of the above could be correct.
Silicon has an atomic number of 14 and a mass number of 28. How many neutrons are found in silicon?
A. 28 B. 14 C. 42 D. 8