Which of the following elements correctly pairs an essential element in plants with its function?
A) nitrogen â€" component of nucleic acids, proteins, hormones, coenzymes
B) magnesium â€" component of nucleic acids, phospholipids, ATP, several coenzymes
C) phosphorus â€" cofactor functioning in protein synthesis
D) potassium â€" component of chlorophyll; activates many enzymes
E) sulfur â€" component of DNA; activates some enzymes
Answer: A
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The umbilical cord functions to
(a) carry waste products in the blood from the fetus to the mother. (b) carry waste products in the blood from the mother to the fetus. (c) carry oxygen in the blood from the mother to the fetus. (d) do both a and c.
Which of the following is not a member of the phylum Platyhelminthes?
a. fluke b. tapeworm c. flatworm d. ribbon worm
The adaptive benefit of flowers in the angiosperms is that they
A. are structures of plants that are only ornamental and have no reproductive value in plants. B. produce both pollen and egg cells. C. are produced by both gymnosperms and angiosperms. D. produce egg cells only. E. produce pollen only.
Certain mutations in the regulator gene of the lac system in E. coli result in maximal synthesis of the Lac proteins (?-galactosidase, etc.) even in the absence of the inducer (lactose). Provide an explanation for this observation
What will be an ideal response?