Bony fishes possess a lateral line system to
A. store urine until excreted.
B. regulate oxygen concentrations in their blood.
C. cleanse the blood of toxins.
D. detect changes in water pressure.
E. regulate their buoyancy.
Answer: D
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Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
An infected individual who is a potential source of infection for others and plays an important role in the epidemiology of the disease is a/an ________.
A. carrier B. host C. reservoir D. index case
Gene flow is the
A) migration of individuals between populations. B) transfer of genes within a population. C) variation of alleles within a population. D) movement of alleles between populations.
________ cells may differentiate into any cell or tissue type
A) Pluripotent B) Omnipotent C) Totipotent D) Hyperpotent E) Potent