Plants having the ability to take up organic nitrogen are most likely in which of the following
environments?
a. arctic tundra d. grassland
b. salt marsh e. temperate forest
c. tropical forest
A
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The insects were the first organisms to
(a) show bilateral symmetry. (b) exhibit segmentation. (c) fly. (d) develop lungs.
The figure above illustrates a(n) ____
a. guanine nucleotide b. cytosine nucleotide
c. thymine nucleotide d. adenine nucleotide e. uracil nucleotide
What did Watson and Crick deduce about the three-dimensional structure of DNA?
A) There is a repeating pattern every 3.4 nm and every 0.34 nm. B) It is a double-stranded helix. C) It contains a lot of phosphorus. D) It is a large molecule. E) It consists of supercoiled chromatin.
A(n) ________ is a diagram in which blocks represent each trophic level
Fill in the blank(s) with correct word