Which of the following is the best modern definition of evolution?

A) descent with modification
B) change in the number of genes in a population over time
C) survival of the fittest
D) inheritance of acquired characters


Answer: A

Biology & Microbiology

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The simplest sensory receptors are __________ that respond to mechanical distortion, changes in temperature, or specific chemicals.  

A.  nociceptors B.  free nerve endings C.  gated channels D.  photoreceptors E.  ganglia

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Which of the following is LEAST likely to result from a point mutation?

a. frameshift b. silent mutation c. transition d. transversion

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In vesicle fusion with a target membrane, ATP hydrolysis is required to

a. bind t- and v-SNAREs together. b. bind SNAREs to Rabs. c. bind NSF to SNAP. d. separate the bound t-and v-SNAREs.

Biology & Microbiology

Which of the following nitrogenous waste products is the least toxic, but requires the most energy to produce?

A) Urine B) Urea C) Uric acid D) Ammonia

Biology & Microbiology