A newly discovered prokaryote produces a compound with promising antimicrobial effects. Devise a set of tests to determine whether the antimicrobial is broad or narrow spectrum and bactericidal or bacteriostatic
What will be an ideal response?
Answers will vary somewhat, but the following includes elements which should be present. The spectrum of action can be determined by testing the antimicrobial against representatives of the various groups of pathogenic bacteria: Gram positives such as Staphylococcus, Streptococcus, and Bacillus, members of the Gram-negative Enterobacteriaceae and other Gram-negative bacteria (Neisseria, for example), mycobacteria, and chlamydias. These tests might be done on broth cultures as MIC tests, or plate cultures as Etests. One or more broad spectrum antibiotics should be included as controls. Once susceptible microbes have been identified, MBC tests can be conducted to determine whether the antimicrobial is bacteriostatic or bactericidal. Appropriate controls should be included.
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Assuming that aerobic metabolism starts with glucose as its fuel, approximately _____% of the energy of the starting molecules will be captured in a useful form. The remaining energy will be converted to _____ and will be either lost or used to _____
A. 42; heat; warm the animal B. 42; electricity; keep the circulatory system functioning C. 58; heat; warm the animal D. 75; light; carry out photosynthesis E. 42; light; carry out photosynthesis
Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?
A) S phase B) prophase I C) metaphase I D) anaphase I E) prophase II
What are the two primary factors that can cause deciduous trees to drop their leaves? What will be an ideal response?
________ is an evolutionary mechanism that favors the reproductive success of certain members of a population over others as a result of differences in anatomical, physiological, or behavioral traits they possess
Fill in the blank(s) with correct word