The optimal pH range for most freshwater fishes and invertebrates is
A. 2 - 6
B. 2 - 4
C. 4 - 6
D. 6 - 9
E. 8 - 11
D. 6 - 9
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Linen is woven from strands of sclerenchyma _______ that occur in the phloem of flax (Linum spp.).
A. tracheid B. sieve C. sclerid D. collenchyma E. fiber
Bacteria in the colon protect people from some infections.?
Indicate whether the statement is true or false.
The neural circuit that allows a male stickleback fish to orient and behave aggressively towards an inanimate object with a red stripe is an example of a(n)
A. stimulus-response chain. B. supernormal stimulus. C. innate releasing mechanism. D. sign stimulus. E. fixed action pattern.
When considering DNA and RNA, which of the following statements is generally FALSE?
a. There are five major types of nitrogenous base. b. There are two types of purines and three types of pyrimidines. c. There are two types of purines and two types of pyrimidines. d. A free 3' hydroxyl group is found in deoxyribose. e. A free 3' hydroxyl group is found in ribose.