Certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps. This evidence supports the claim that _____
A) natural selection produces organs that will be needed in future environments
B) the motors of bacterial flagella must have originated in other organisms
C) natural selection can produce new structures by coupling together parts of other structures
D) bacteria that possess flagella must have lost the ability to pump certain chemicals across their plasma membranes
C
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Which of the following characteristics of the lactose operon is not true of the galactose operon?
A. Repressor binding prevents RNA polymerase from binding to the promoter. B. CRP activates expression when bound to cAMP. C. Expression is high when glucose levels are low and the activating metabolite is present. D. Expression is low when glucose levels are high.
Small circular molecules of DNA in bacteria are called
a. plasmids. b. desmids. c. pili. d. F particles. e. transferrins.
Which of the following is NOT an example of a pronatalist pressure?
A. Children are a source of pride, pleasure, and comfort. B. Children can contribute to the household income. C. Children may support their parents as they grow older. D. Children can replace members of society as they die. E. All of the above are examples of pronatalist pressures.
Stanley Miller's experiment that applied electric sparks to a reducing atmosphere of methane, ammonia, water, and hydrogen showed that under these conditions,
a. nucleotides can form. b. amino acids can form. c. amino acids can polymerize into polypeptides. d. nucleotides can polymerize into nucleic acids.