A common treatment approach for infertility resulting from a low sperm count is
A. surrogate motherhood.
B. artificial (intrauterine) insemination.
C. advice to have intercourse only once a month to build up sperm stores.
D. fertility drug therapy.
B. artificial (intrauterine) insemination.
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How does allelic exclusion prevent multiple heavy-chain rearrangements from occurring in pre-B cells?
A. RAG1 and RAG2 are down-regulated, and TdT activity is lost so that no additional heavy-chain rearrangements may take place. B. RAG1 is up-regulated while RAG2 and TdT are down-regulated to prevent heavy-chain recombination on the second set of chromosomes. C. RAG1 and RAG2 induce silencing of the second alleles for VH-DJH rearrangement. D. TdT initiates light-chain rearrangement. E. TdT releases a cytokine to trigger apoptosis in the pre-B cell.
The outer layer known as the white of the eye is the ________
Fill in the blank(s) with correct word
If left untreated, congenital hypothyroidism will result in mental disability
Indicate whether the statement is true or false
The greatest potential for reducing morbidity, saving lives, and reducing health care costs in the United States through health promotion and disease prevention was realized by the
A) early 1900s. B) late 1950s. C) mid 1970s. D) early 2000s.