During a fermentation experiment in lab, two different samples of grape juice have been inoculated with yeast. Air has been evacuated from sample I, but not from sample II. In which sample would you predict to the greater alcohol production?
A. sample I
B. sample II
C. Similar alcohol production is expected in both samples.
D. This cannot be predicted based on the information provided.
Answer: A
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A catalase test was performed from a sheep blood agar plate on a colony of streptococci, and bubbling was observed. Which of the following statements explains this discrepancy?
a. Catalase is the inappropriate test to use on colonies of streptococci; therefore the re-sults are invalid. b. The colony may have been contaminated with sheep red blood cells, causing a false-positive result. c. The colony was most likely enterococci, not streptococci. d. No discrepancy is present. Streptococcus is a catalase-positive colony.
________ defenses are not permanently present but, rather, are brought about by the presence or action of predators
Fill in the blank(s) with correct word
Compare and contrast DNA synthesis in prokaryotes and eukaryotes. What will be an ideal response?
Who proposed the concept of chemotherapy, that compounds might selectively kill pathogens without harming people?
A) Gerhard Domagk B) Alexander Fleming C) Paul Ehrlich D) Selman Waksman E) Joseph Lister