When cichlids were present, what was the main selection factor affecting the average number of spots on male guppies?
a. natural selection for a reduction in spot number in order to avoid predation
b. natural selection for an increase in spot number to enhance camouflage ability
c. natural selection for a reduction in spot number to enhance attractiveness tofemales
d. natural selection for an increase in spot number to enhance attractiveness tofemales
a
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The polymerase chain reaction (PCR) can detect as few as 10 toxin-producing Escherichia coli in a population of 100,000 microorganisms isolated from soft cheese samples.
Answer the following statement true (T) or false (F)
Which of the following structures in males is shared by both the urinary and reproductive systems?
a. urinary bladder b. prostate gland c. ureter d. vas deferens e. urethra
Which of the following cells has the greatest number of different cellular organelles made of membranes?
A. bacteria B. animals C. plants D. viruses
A bacteriophage transfers DNA of the previous host to the current host. This is an example of
A. conjugation. B. specialized transduction. C. generalized transduction. D. creation of an Hfr cell.