It has been observed that people with relatively high stress levels get a relatively high number of colds. What would this be an example of?
A) correlation
B) experiment
C) variable
D) hypothesis
A
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Four of the five answers represent events that occurred when free oxygen (O2) became available in the atmosphere. Select the exception
a. aerobic respiration emerged. b. some organisms changed their metabolism. c. some species that could not detoxify free radicals became restricted to the low-oxygen environments that remained. d. oxygen was toxic to many species and some cells and forms of life became extinct. e. photosynthesis was no longer a common form of energy production.
You sample a population of butterflies and find that 42% are heterozygous at a particular locus (location of gene). What should be the frequency of the recessive allele in this population?
a. 0.09 b. 0.30 c. 0.49 d. 0.70 e. allele frequency cannot be determined from this information
Which component of ATP synthase is the site of the proton channel?
A) F0. B) F1. C) F2. D) B subunit. E) G subunit.
What is one of the advantages of producing human growth hormone (HGH) from a cloned gene in a bacterial cell?
A) As the protein is introduced therapeutically, it transfers the HGH gene as well. B) Larger quantities are available. C) The bacterial protein has a different amino acid sequence that is more effective. D) The product can be administered by infecting a person with the recombinant bacteria. E) A gene cloned from mice, rather than from humans, can be used.