If A, B, and C are all required for growth, a strain mutant for the gene-encoding enzyme B would be capable of growing on which of the following media?
A. minimal medium supplemented with C only
B. minimal medium supplemented with nutrients A and B
C. minimal medium supplemented with A only
D. minimal medium
E. minimal medium supplemented with B only
Ans: A. minimal medium supplemented with C only
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Cuvier, an anatomist and paleontologist,
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Which feature is shared by euglenoids and
kinetoplastids? a. an eyespot b. a single flagellum c. photoautotrophy d. parasitic existence e. live in marine and freshwater habitats
How do smoking and alcohol consumption affect cancer risk?
A) Smoking combined with alcohol consumption results in greater cancer risk. B) Drinking alcohol results in greater cancer risk than smoking. C) Smoking or drinking alcohol result in similar cancer risk. D) Smoking results in twice the cancer risk of drinking.
Bacteria that have a spherical shape are called ________
A) coccus B) bacillus C) spirillum D) spheroid