Which of the following is not true of coliforms?
A. Coliform counts are not specific for a particular species of bacteria.
B. They include E. coli, Enterobacter, and Giardia.
C. They are gram-negative, lactose-fermenting, and gas-producing.
D. Finding coliforms in water indicates fecal contamination.
Answer: B
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Sulfonamides inhibit the production of folic acid and, therefore, inhibit the synthesis of ________.
A. peptidoglycan B. aromatic amino acids C. purines and pyrimidines D. ribose
Which is an example of macroevolution?
a. conserved ancestral features of the modern day coelacanth b. the mass extinction of the dinosaurs 66 million years ago c. the evolution of humans from primates d. the adaptations of flowering plants driven by changes in pollinator behavior e. the evolution of antibiotic-resistant bacteria
A couple has a child with Down syndrome. The mother is 39 years old at the time of delivery. Which of the following is the most probable cause of the child's condition?
A) The woman inherited this tendency from her parents. B) The mother had a chromosomal duplication. C) One member of the couple underwent nondisjunction in somatic cell production. D) The mother most likely underwent nondisjunction during gamete production.
Bioinformatics includes _____. I. using computer programs to align DNA sequences II. creating recombinant DNA from separate species III. developing computer-based tools for genome analysis IV
using mathematical tools to make sense of biological systems A) I and II B) II and III C) II and IV D) I, III, and IV