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%
Answer: B
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A high concentration of chlorophyll imbedded in the plasma membrane fold of a newly discovered species of bacteria suggests a:
A. Chemolithoautotrophic metabolism B. Chemoheterotrophic metabolism C. Photoautotrophic metabolism D. Photoheterotrophic metabolism Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about bacterial metabolism? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What parental blood type would not be able to produce a child with type O blood?
A) A B) B C) AB D) O
After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. Which factor should be measured to determine the difference in effectiveness between the two sites?
A. Nutrient levels B. pH C. Salinity D. Oxygen levels E. Temperature F. All of these factors may play a role.
If high amounts of sulfanilamide are in the presence of an enzyme whose substrate is PABA, what outcome is expected?
a. PABA products will increase in concentration. b. The enzyme will stop functioning. c. The substrate will destroy the inhibitor. d. Sulfanilamide products will be in higher concentration.