Adaptive evolution is constrained because natural selection acts on
1.traits an animal needs to acquire in order to survive.
2.existing genetic variation only.
3.existing genetic variation plus new mutations.
4.All of the options are correct.
3
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The lowest concentration of drug that yields no growth during a dilution method is called
A) minimum bactericidal concentration B) minimum inhibitory concentration C) mutant prevention concentration D) serum killing power
Which of the following statements regarding resolution is true?
A. In order to achieve high magnification with good resolution, a small objective lens must be used. b. The white light used in a compound light microscope has a relatively short wavelength in order to resolve structures smaller than 0.002 µm. c. A general principle of microscopy is that the shorter the wavelength of light used in the instrument, the lower the resolution. d. Resolution (resolving power) is calculated by multiplying the objective lens power by the ocular lens power.
Which portal of entry is the most commonly used by pathogens?
A. gastrointestinal B. urogenital C. skin D. respiratory E. They are all equally used as portals.
Lung cancer, like breast cancer, is more prevalent in women than in men.
Answer the following statement true (T) or false (F)