Because it is an enclosed compartment of fluid under pressure, the coelom can serve as a
_____, which shapes the body of soft animals.
a. food vessel
b. pressure balloon
c. hydrostatic skeleton
d. cartilaginous skeleton
e. storage compartment
ANSWER: c
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You recently discovered a new element, and find that this particular element has one electron its outer energy level. What would you expect will happen to an atom of this element if placed in water?
A. It will gain an electron forming a positive ion. B. It will lose an electron forming a negative ion. C. It will lose an electron forming a positive ion. D. It will gain an electron forming a negative ion.
The Staphylococcus aureus toxins are
A) neurotoxins. B) endotoxins. C) ectotoxins. D) superantigen toxins.
Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI-gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain?
A. Trancription of the lac operon is repressed. B. Trancription of the lac operon does not change. C. The lac operon is constitutively expressed. D. Nonfunctional proteins are produced. E. The lac operon is constitutively expressed and nonfunctional proteins are produced.
Which of the following is/are hydrophilic?
A. cholesterol B. glucose C. vegetable oil D. Vegetable oil, butter, and cholesterol are correct. E. butter