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Exam One PRACTICE Qs
Which of these statements about obligate anaerobes is true A They cannot grow from BIO 110 at Pennsylvania State University
Which of these statements about obligate anaerobes is true?A)They cannot grow in the presence of oxygen and some species may die.B) They must have oxygen to survive.C) They will use oxygen if it is present, but can survive without it.D) They generate oxygen through photosynthesis.
In experiments done in the 1920s to study the bacterium that causes pneumonia, Frederick Griffith found that harmless R strain bacteria became lethal S strain bacteria when mixed with a culture of heat-killed S strain bacteria. This is because bacteria can undergo:
The experiments done by Hershey and Chase to confirm that DNA is the genetic material relied upon understanding and applying concepts that you have learned in this class. Which of these statements describes an understanding that was important to the design of their experiments? Choose all that apply.
Results: Details the data collected from the experiments performed or observations madeMaterials and Methods: Describes the experimental protocols usedDiscussion: Summarizes and evaluates the findings of the research studyIntroducton: Outlines the question being askedDiscussion: Suggests additional avenues of research based upon the results of this studyIntroducton: Describes the hypothesis being tested in this study
Clostridium botulinumis an anaerobic gram positive bacterium, and produces botulism toxin, one of the most potent human toxins. Endospores of this bacterium are ofen found in honey, and parents are advised not to feed raw honey to children under the age of two because it can lead to infant botulism. Why is it dangerous for infants to consume these endospores?
Which of the following is a plausible hypothesis for whyBacillus subtilisliving on the south-facing slope of the Evolution Canyon have more efficient biosynthesis than those living on the north-facing slope?A) The bacteria are from different species and are expected to have different biosynthetic abilities.B) The south-facing slope has more resources available for growth so the bacteria have more energy to biosynthesize at a greater rate.C) The south-facing slope is a more extreme environment and efcient biosynthesis is an adaptaton to this environment.D) The south-facing slope is the more desirable habitat and the bacteria with greater biosynthetic ability outcompeted other bacteria for this habitat.