Which of the following kinds of animals excrete their nitrogenous waste entirely as ammonia?
A) birds
B) fish
C) land snails
D) insects
Answer: B
Biology & Microbiology
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Most of the phyla of the animal kingdom are of animals that occur
A. in the sky. B. on land. C. in freshwater habitats. D. in the ocean.
Biology & Microbiology
What was the first substance produced by microorganisms to be used pharmaceutically?
A) penicillin B) streptokinase C) taxol D) human insulin E) interferons
Biology & Microbiology
Gametes with extra or missing chromosomes are the result of
a. fertilization. b. recombination. c. nondisjunction. d. independent assortment.
Biology & Microbiology
A particular carbon isotope has an atomic number of 6 and an atomic mass of 14. The respective number of neutrons, protons, and electrons that this carbon isotope has is _______.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology