Who was the first person to realize the importance of hand washing between examinations of patients?
A. Ignatz Semmelweis
B. Louis Pasteur
C. Robert Koch
D. Joseph Lister
E. Paul Ehrlich
Ans: A. Ignatz Semmelweis
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The full extent of the diversity and abundance of life on earth has only been understood in the past few years as a result of
A. advances in deep oceanography and deep earth mining engineering. B. microscopy techniques to identify the vast quantity of viruses present in all environments. C. techniques to identify organisms that do not rely on culturing. D. environmental movements to preserve parks, coral reefs, and glaciers.
Which of the following statements explains how N-formylmethionine (fMet) is incorporated only in response to the 5'-AUG initiation codon in E. coli, given that methionine has only one codon?
A. There is only one tRNA with the CAU anticodon. B. Only Met-tRNAmet can bind to a specific ribosomal entry site. C. The N-formyl group on methionine prevents fMet from entering interior positions in a polypeptide. D. fMet is always incorporated at interior AUG sites and then deformylated after translation.
Virulent pathogens are
A. more likely to cause disease. B. more likely to cause severe disease. C. unable to cause disease. D. more likely to be opportunists.
A vast majority of scientists agree that disruption of the carbon cycle by human activities is altering the Earth’s climate and warming the planet
1.True 2.False