The maximum density of pure water occurs at:
a. -2° C.
b. 0° C.
c. 3° C.
d. 4° C.
e. -4° C.
D
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Natural selection is one mechanism to change allele frequency in a gene pool, what is the name of the mechanism that fosters change in allele frequencies due to random chance?
A. Genetic Drift. B. Natural selection also fosters these changes. C. Non-Darwinian evolution. D. Neutral variation. E. Gene flow from one population to another.
Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?
a. the drop in surface UV radiation caused by the formation of the ozone layer b. the depletion of dissolved organic material from the oceans c. the ability of some organisms to use oxygen to generate ATP during respiration d. an increase in visible light intensity at the surface of the Earth, caused by solar flares e. an increase in volcanic activity and release of CO2 into the atmosphere
Which of the following is NOT an oncogenic virus?
A. Varicellovirus B. HTLV-1 C. Hepatitis B virus D. Human papillomavirus
A virulence factor can be transferred from one strain of bacteria to another in a genetic process that is independent of cell-to-cell contact between the donor and the recipient. Addition of DNase does not interfere with the transfer of the virulence factor either. From these characteristics, which of the following processes is involved in this genetic transfer?
A. Transduction. B. Conjugation. C. Transposition. D. Transformation. E. Transversion.