When a population has a gene with four alleles circulating, how many possible genotypes are there?
a) 3
b) 6
c) 10
d) 16
Ans: c) 10
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Molecules with the same empirical formula but different structural formulas are
A. polymers. B. steroids. C. isomers. D. enzymes.
Capsules play a role in the virulence of all of the following except __________.
A) Mycobacterium tuberculosis B) Yersinia pestis C) Klebsiella pneumoniae D) Haemophilus influenzae E) Bacillus anthracis
All of the following statements are true regarding discoveries made by the Human Microbiome Project except
a) the genes coded by our microbiome number in the millions, whereas human cells contain approximately 21,000 genes. b) areas of the body once believed to be sterile, are now known to harbor microbes. c) the microbiota does not contain pathogens; all of the microbes in our microbiome are non-pathogenic. d) the composition of the microbiome has implications for the development of other, non-infectious diseases such as diabetes, obesity and asthma. e) bacteria, as well as viruses and fungi, make up the microbiome
Your friend has never gardened before. When none of the seeds he planted germinate, he asks you to suggest why. Which is the best explanation of what occurred?
A. The monocot seeds he used were only able to produce a single cotyledon each. B. The seeds were planted too deeply and used up their reserves before reaching the surface and sunlight. C. The suspensor failed to develop into an embryo within each seed. D. All seeds require fire in order to germinate. E. Seeds take more than one season to germinate.