The clear area devoid of bacterial growth around an antiseptic or disinfecant disk is referred to as the

no growth zone
death zone
zone of death
zone of inhibition


zone of inhibition

Biology & Microbiology

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Viroids are naked (lacking a protein shell) pieces of DNA that infect plants

Indicate whether this statement is true or false.

Biology & Microbiology

Which of the following do I need to amplify the DNA for gene X and not for gene Y?

a. Some prior knowledge of the sequence of gene X so appropriate primers can be designed. b. a heat-stable DNA polymerase c. restriction endonucleases that cut gene X and not gene Y d. plasmid vectors that have multiple antibiotic resistance genes. e. A cDNA library and access to probes for gene X

Biology & Microbiology

Energy is commonly defined as “the capacity to do

work.” This definition is a. incorrect. b. adequate in the physical sciences. c. adequate in the biological sciences. d. no more than a clue to the actual properties of the concept. e. not accepted by most scientists.

Biology & Microbiology

At what level of organization does life begin?

A. Reproductive organs B. Cell C. Molecule (water) D. Molecule (DNA) E. Population

Biology & Microbiology