Which one of the following statements is true regarding endotoxins?
a. They are produced and released by living bacteria.
b. They are associated with gram-positive bacteria.
c. They interrupt protein synthesis.
d. They are released upon cell death.
D
Endotoxins are found within gram-negative bacteria and are released only upon cell lysis and death.
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Use the following study to answer the following question(s): A researcher applies varying amounts of fertilizer (0, 2, 4, 8, 10 units) to 50 potted tomato plants. All other variables that may affect the outcome (watering, temperature, sunlight, plant size, etc.) are kept the same from pot to pot. At the end of the growing season, the tomatoes grown on each plant are weighed to determine which fertilizer level produced the largest tomato yield.Which variable is the independent variable?
A. The fertilizer amount B. The tomato yield at the end of the growing season C. The plant size at the end of the growing season D. The temperature
The data from the butterfly experiment reflected
which of the following? a. natural selection b. food choices by predators c. the ability of birds to find the prey d. the role of mimicry e. all of these
If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.
A. 80% B. 30% C. 20% D. 40% E. 15%
Upon establishment of germs as the cause of infectious diseases, scientists advocated the destruction of these microbes by exploiting the difference in nature of these germs and the host. This may be achieved by having agents acting only on the germs and not the host or what is known as "selective toxicity". The latter term was coined by
A. Louis Pasteur B. Robert Koch C. Joseph Lister D. Paul Ehrlich E. Alexander Fleming