Deficiency in RAG-1 and/or RAG-2 can affect the proper development of which of the following cell types, resulting in decreased numbers of circulating cells of those types?
A. B cells
B. T cells
C. NK cells
D. Both A and B
E. All of the above
D
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Chemicals such as DDT and DES interfere with reproduction by
A. disrupting endocrine activity. B. destroying reproductive organ tissues. C. causing mutations in sperm and ova. D. making sex fluids highly acidic.
Which statement is NOT a contraindication for taking oral contraceptives?
A) irregular menstrual cycles B) migraine headaches C) history of breast cancer
All of the following are symptoms of schizophrenia EXCEPT
A) delusions. B) hallucinations. C) the ability to distinguish what is real from what is imaginary. D) inappropriate emotions.
A rhythmic cycling of breathing with an increase in respirations followed by apnea is ________
A) asthma B) Cheyne-Stokes respiration C) emphysema D) cystic fibrosis