Algal blooms in ponds are often due to the accumulation of excess
a. phosphorus and nitrogen.
b. oxygen and carbon.
c. phosphorus and carbon.
d. oxygen and nitrogen.
a. phosphorus and nitrogen.
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A new DNA strand elongates only in the 5' to 3' direction because
A) DNA polymerase begins adding nucleotides at the 5' end of the template. B) Okazaki fragments prevent elongation in the 3' to 5' direction. C) the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. D) replication must progress toward the replication fork. E) DNA polymerase can only add nucleotides to the free 3' end.
Which embryonic tissue is incorrectly associated with its derivative?
a. skin; ectoderm b. nervous system; ectoderm c. liver; endoderm d. circulatory system; mesoderm e. brain; mesoderm
In the central nervous system messages are coordinated and integrated and instructions are sent via nerves to ______.
Fill in the blank(s) with the appropriate word(s).
What kind of fruit is formed from fused ovaries of several individually pollinated flowers?
a. aggregate b. simple c. multiple d. accessory e. berries