Characteristics of rickettsias include
A. arthropods serve as life cycle hosts and vectors.
B. host cells are required for ATP metabolism.
C. obligate parasites requiring host cells for growth.
D. gram negative coccobacilli.
E. All of the choices are correct.
Answer: E
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About twenty-five of the ninety-two natural elements are known to be essential to life. Which four of these twenty-five elements make up approximately 96 percent of living matter?
A) carbon, sodium, hydrogen, nitrogen B) carbon, oxygen, phosphorus, hydrogen C) oxygen, hydrogen, calcium, nitrogen D) carbon, hydrogen, nitrogen, oxygen E) carbon, oxygen, nitrogen, calcium
Nerve impulses travel along neurons by the opening of channels that allow sodium ions to flow inward, followed by an outward flow of potassium ions
In order to ensure that the impulse may be produced at any time, sodium is actively transported out of the cell and potassium is transported into the cell by the sodium/potassium pump. Which of the following types of work is performed by the sodium/potassium pump? A) mechanical B) electrical C) concentration D) synthetic E) bioluminescent
What is the role of erythropoietin?
What will be an ideal response?
Laboratory animals must be used to determine lethal and infectious doses of viruses.
Answer the following statement true (T) or false (F)