Changes in the immune system that accompany aging include
A) T cells becoming less responsive to antigens.
B) more cytotoxic T cells responding to infections.
C) increased numbers of T helper cells.
D) higher levels of antibodies after initial exposure to antigens.
E) enlargement of the thymus and increased levels of circulating thymic hormones.
A) T cells becoming less responsive to antigens.
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A sterile male with undeveloped testes, enlarged breasts, and unusually long arms and legs most likely has which syndrome?
A. Patau syndrome B. Turner syndrome C. Klinefelter syndrome D. Fetal alcohol syndrome E. Down syndrome
The link between peripheral receptor and cortical neuron is called a(n)
A) efferent pathway. B) spinocortical line. C) sympathetic chain. D) adaptation pathway. E) labeled line.
Thyroid hormone, epinephrine, and melatonin are examples of what category of hormone?
A. Amino acid derivatives B. Proteins C. Steroids D. All of these answers are correct.
The transfer of information from DNA to messenger RNA (mRNA) is known as ________.
A. transmutation B. transduction C. transcription D. translocation E. translation