Large pre-B cells undergo clonal expansion before the rearrangement of light-chain loci. Which of the following are beneficial consequences of clonal expansion? (Select all that apply.)
a. Autoreactive B cells are eliminated before the expenditure of energy needed to rearrange a functional light-chain gene.
b. The energy used to make a functional heavy chain is not wasted as a result of the inability to produce a functional light chain.
c. RAG gene expression is decreased, which in turn signals light-chain rearrangement.
d. A diverse population of immature B cells is generated that express the same ? chain but a distinct light chain.
e. Approximately 85% of small pre-B cells will progress to the immature B-cell stage.
b, d, e
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A normal blood pressure is
A. 110/50. B. 120/80. C. 130-85. D. 140/90.
Studies conducted at Columbia University have found exercise impacts the behavior and development of the brain. Which of these did they propose to be a physiological explanation for this?
A. Physical activity increases social connectedness with peers. B. Fatigue from previous exercise enables children to sit still in class. C. Exercise increases brain neurotransmitters. D. Dropout rates decline in those who participate in sports.
A nurse knows the proper procedures following the occurrence of a medication error. What is the BEST action the nurse can take with regard to documentation?
a. Document the error and the corrective action taken, and complete an incident report. b. Complete an incident report, and submit to the supervisor. c. Document the error, and wait for instructions on how to proceed. d. Ask the physician to document the error and any corrective actions taken.
A measure is valid if it correctly measures the items under investigation
Indicate whether the statement is true or false