You are interested in studying a receptor and decide to make a knockout mouse. However, you notice severe developmental defects that result in embryonic lethality in this receptor knockout
Which developmental process is most likely affected when you disrupt a receptor on the cell surface, disrupting its ability to receive a signal and initiate a transduction pathway?
A) Cell proliferation
B) Cell-cell interactions
C) Cell differentiation
D) Cell movement
E) Apoptosis
Answer: B
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List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
Endoderm: Mesoderm: Ectoderm:
Which system is considered an open system?
a. a human b. a thermos c. a wine keg d. a greenhouse e. the Earth
What type of immunity is associated with breast feeding?
A) innate immunity B) active immunity C) passive immunity D) cell-mediated immunity
What characteristic does Vibrio share with Salmonella?
A. Both have O polysaccharide antigens. B. Both are oxidase positive. C. Both have polar flagella. D. Both have similar shape. E. Both are spread primarily by fecal contamination.