All of the following are involved in light production of bioluminescent bacteria except:
a. luciferin.
b. luciferase.
c. cellulose.
d. oxygen.
C
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In the past, species of sponges, cnidarians, and ctenophores were referred to as "lower" or "primitive" animals because of their relatively simple body plans and lack of any sophisticated organ differentiation
Which of the following suggest that the terms "lower" or "primitive" are not useful as descriptors for these organisms? A. Many members of these groups are active predators and feed on other organisms. B. These groups have been around for millions of years, so their evolutionary path has been successful in spite of limited complexity. C. These groups are not primary producers, so should not be classified as "lower" because they occur higher on the trophic pyramid. D. These groups harbor a lot of genetic variation; "lower" groups would have less evolved genomes.
What is the CORRECT order for the application of Koch's postulates?
I. Inoculate suspect agent into test subject and observe that subject develops disease of interest. II. Isolate and culture suspect agent in the laboratory. III. Find suspect agent is every case of disease of interest but not in healthy hosts. IV. Recover and isolate suspect agent from test subject. A) III, I, IV, II B) IV, I, III, II C) I, II, III, IV D) III, II, I, IV E) IV, I, II, III
The function of the "ciliary escalator" is to
A) propel inhaled dust and microorganisms toward the mouth, away from the lower respiratory tract. B) remove microorganisms from the gastrointestinal tract. C) remove microorganisms from the lower respiratory tract. D) trap microorganisms in mucus in the upper respiratory tract. E) trap inhaled dust and microorganisms in mucus and propel it away from the lower respiratory tract.
Hormones made from variations on the cholesterol molecule are:
A) glycolipid hormones. B) protein hormones. C) peptide hormones. D) glycoprotein hormones. E) steroid hormones.