When the resident microbiota prevents the establishment of a pathogen, it is called _______.
A. a nonliving reservoir
B. microbial antagonism
C. a superinfection
D. disruption
B. microbial antagonism
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During which phase of gamete production do duplicated homologous chromosomes line up closely?
a. meiosis I b. meiosis II c. fertilization d. mitosis I e. mitosis II
Which of the following is an accessory organ of the human digestive system?
A. Salivary gland B. Esophagus C. Stomach D. Small intestine E. Large intestine
A Type I survivorship curve is ___________
A. convex, such as that of humans B. diagonal, such as that of lizards, small mammals, and large birds C. concave, such as marine animals that release eggs D. S-shaped, such as that of small birds E. logarithmic, such as that of weeds
Answer the following questions true (T) or false (F)
1. T cells are a type of lymphocyte. 2. T cells develop in the thalamus. 3. Helper T cells are also called CD4 cells due to the receptors found on their surfaces.