Which of the following are group A Streptococcus (GAS)?
A) Streptococcus aureus
B) Streptococcus pneumonia
C) Streptococcus pyogenes
D) Streptococcus viridans
Answer: C
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Mendel's experiments with garden peas differed from those of other plant hybridizers of the time in that:
A. Mendel studied true-breeding strains, rather than poorly defined material. B. Mendel focused on a small number of easily contrasted traits, rather than a large number of more complex traits. C. Mendel quantified his results and looked for statistical patterns, rather than simply noting the presence or absence of a trait among a group of offspring. D. Mendel performed no crosses between strains, whereas other hybridizers did. E. Mendel studied true-breeding strains, focused on a small number of easily contrasted traits, and quantified results.
Most antibiotics are produced by ________.
A. streptomyces B. unicellular bacteria C. protozoa D. yeasts
Avery, Macleod, and McCarty expanded on Griffith's experiment to prove that DNA is the hereditary molecule required for transformation. What treatment of the heat-killed SIII bacteria extract resulted in the mouse living?
A) destroying type SIII lipids and polysaccharides B) destroying type SIII DNA with DNase C) destroying type SIII RNA with RNase D) destroying type SIII proteins with protease E) the control group (null treatment), in which all components are intact
The energy level listed below with the most energetic electrons is
A. 1. B. 2. C. 3. D. None of these. All energy levels contain electrons of equal energy.