Which type of blood cell is NOT produced from myeloid stem cells?
a. basophils
b. B lymphocytes
c. eosinophils
d. erythrocytes
e. neutrophils
B
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Staphylococcus aureus is a common cause of food poisoning in the United States.
Answer the following statement true (T) or false (F)
Which of the following represents the genotype of a male who is color-blind?
A. XbXb B. XBY C. XbY D. XBXB E. XBXb
Foreign substances like nicotine, morphine, and menthol exert their initial effects by _____
(a) killing cells immediately, exerting their physiological effects by causing cell death. (b) diffusing through cell plasma membranes and binding to transcription factors to change gene expression. (c) interacting with cell-surface receptors, causing the receptors to transduce signal inappropriately in the absence of the normal stimulus. (d) removing cell-surface receptors from the plasma membrane.
Which of the following is necessary in applying the molecular clock approach to determine when HIV first infected humans?
a. A relatively consistent rate of evolutionary change in the virus b. Multiple samples of the virus taken in different years c. RNA nucleotide sequence data from the virus d. All of the listed responses are correct. e. None of the listed responses are correct.