In which of the following would the most highly conserved sequences of nuclei acids be located?
(A) Structually critical regions of a polypeptide such as an active site region
(B) The intron regions of pre-mRNA sequences
(C) Ribosomal RNA sequences
(D) Bacterial genes conferring antibiotic resistance
Ans: (C) Ribosomal RNA sequences
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The leopard seal's primary predator is called the:
a. sperm whale. b. polar bear. c. killer whale. d. salt water crocodile. e. Weddel seal.
__________, which assists in fat digestion, is made
in the liver and stored in the __________. Fill in the blank(s) with the appropriate word(s).
The most frequently used portal of entry for pathogens is the
A) mucous membranes of the respiratory tract. B) mucous membranes of the gastrointestinal tract. C) skin. D) parenteral route. E) All of these portals are used equally.
Microorganisms play an active role in the formation of industrial products. Which of the following is mismatched?
A) Penicillium — treatment of disease B) Saccharomyces cerevisiae — for fermentation C) Rhizobium — increases nitrogen in the soil D) Bacillus thuringiensis — insecticide E) algae — citric acid