Which of the following was successfully used to treat a patient with severe combined immunodeficiency (SCID)?
A) Vaccines
B) Gene therapy
C) Bt toxins
D) Growth hormones
E) Insulin
B
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If you were designing a new insecticide absorbed via the respiratory system in arthropods, the killing chemical would enter the invertebrate through the
A. epidermis. B. tracheae. C. alveoli. D. bronchioles. E. gills.
A thin layer of protein, within epithelial tissue, that anchors the epithelium to the extracellular matrix is the
A. basement membrane. B. compact bone. C. hyaline cartilage. D. plasma membrane. E. neuroglia.
A genetic disorder that involves impaired
blood clotting is
a. leukemia. b. sickle cell anemia. c. hemophilia. d. atherosclerosis. e. hypertension
When sodium ions move from one cardiac muscle cell to an adjacent cell, causing them to contract in unison, this is an example of ____.
A. autocrine signaling B. paracrine signaling C. contact-dependent signaling D. endocrine signaling E. direct intercellular signaling