If T-lymphocytes that failed the negative selection test were not destroyed, the immune system would likely
A. cause autoimmune disorders.
B. exhibit very delayed activity.
C. be unable to recognize a particular class of pathogen.
D. exhibit more negative membrane potentials.
A. cause autoimmune disorders.
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In order for a muscle to contract properly, it requires
A) Energy. B) Oxygen. C) Nutrients. D) An adequate blood supply. E) all of the above
How does the respiratory system contribute to osteoporosis?
A. Calcium ions released from the bones are excreted. B. Decreased estrogen levels following menopause contribute to the disease. C. Lack of exposure to sunlight reduces vitamin D production and decreases calcium absorption. D. Immune cells resist infections and release chemicals that promote tissue repair. E. Excessive smoking lowers estrogen levels, which increases bone loss.
__________ is(are) formed in an early stage in intramembranous ossification.
A. Osteoid tissue B. A secondary ossification center C. Chondrocyte proliferation D. Chondrocyte hypertrophy E. Blood cells
Determine the sequence of the following events in a cell after exposure of the cell to a chemical signal
(1) increased synthesis of a protein (2) the chemical signal combined with a cytoplasmic receptor (3) an increase in the nuclear concentration of the chemical (4) an increase in mRNA synthesis (5) genes are activated A. 1, 2, 3, 4, 5 B. 2, 1, 3, 5, 4 C. 2, 4, 5, 3, 2 D. 2, 3, 5, 4, 1 E. 2, 3, 4, 5, 1