Why is the acid-fast stain clinically useful?
A) It identifies the causative agents of leprosy and tuberculosis.
B) It identifies the causative agent of strep throat and Scarlet fever.
C) It confirms that a single dose of antibiotics is enough to kill the bacteria.
D) It confirms the results of the Gram stain.
E) It identifies the causative agent of certain fungal infections.
Answer: A
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Which of the phyla of animals has the greatest number of species?
A. Arthropoda B. Chordata C. Mollusca D. Annelida E. Nematoda
In the cerebral cortex, layer 3 is especially noticeable because it:
A) is a different color from the rest B) contains many large neurons C) contains many fibers D) contains no neurons
Which of the following is NOT found in the nucleus?
A. mitochondria B. nucleolus C. chromatin D. DNA
Cerebrospinal fluid circulates in the ________ to deliver nutrients to the brain and spinal cord
A) dura mater B) arachnoid villi C) cranial sinuses D) subarachnoid space E) pia mater