Which of the following does NOT represent a form of parental investment?
A. a spermatophore containing nutrients eaten by a female insect
B. a male fish mouthbrooding eggs abandoned by a female
C. a copulatory plug deposited in the reproductive tract of a female mouse
D. a female bird incubating externally-laid eggs
E. all of the above represent a form of parental investment
Answer: C. a copulatory plug deposited in the reproductive tract of a female mouse
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Differentiation of S. maltophilia and Burkholderia cepacia is best accomplished by:
a. the oxidase test. b. maltose and glucose medium. c. tyrosine-enriched heart infusion agar. d. nitrate reduction.
An organism described as oxidase-positive, (K/NC) on TSI media, growth at 42°C, and produces a bright bluish-green pigment on Mueller-Hinton agar is most likely:
a. P. aeruginosa. b. Pseudomonas fluorescens c. B. cepacia d. B. mallei.
The tightly condensed non-functional X
chromosome is called a(an)
a. Barr body. b. Y chromosome. c. autosome. d. X linked chromosome. e. Watson segment
Proteins that speed up reactions are known as
1.salts 2.buffers 3.monomers 4.polymers 5.enzymes