If a mixture of bacteriophages, some labeled with radioactive sulfur and others labeled with radioactive phosphorus, is
placed in a bacterial culture, the bacteria will eventually contain ____.
a. primarily radioactive sulfur
b. primarily radioactive phosphorus
c. both radioactive sulfur and phosphorus
d. neither radioactive sulfur nor radioactive phosphorus
e. complete viruses with radioactive sulfur coats
ANSWER: b
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A 45-year-old man living in Arkansas made an appointment with his physician after developing several ulcerative lesions on his hands. He also had a high fever and swollen axillary lymph nodes. When taking the patient's medical history, the physician made note of the fact that the man had been hunting rabbits a week earlier, regularly drank unpasteurized milk, and had not received any vaccines since his childhood. What is the most likely cause of the man's current symptoms?
A. Brucellosis B. Anthrax C. Q fever D. Tularemia
Which class of organisms makes up the detrital food web?
a. carnivores and decomposers b. decomposers and detritivores c. decomposers and producers d. herbivores and carnivores e. producers and herbivores
Prokaryotic cells can undergo meiosis
Indicate whether the statement is true or false.
Which of the following is a negative regulator of the cell cycle?
a. cyclin b. human growth hormone (HCG) c. p53 d. cyclin-dependent kinase (Cdk)