A rabbit is eaten by a fox; this is an example of
A. a part of the rabbit's niche.
B. parasitism.
C. mutualism.
D. None of these answers is correct.
A. a part of the rabbit's niche.
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A woman goes to the doctor and is diagnosed as having rheumatoid arthritis. What factors led to her development of this disease? Select all correct choices
A. Some of her T cells were not positively selected. B. Some of her T cells were not negatively selected. C. Some of her T cells are recognizing and responding to her normal self antigens. D. Some of her T cells are not recognizing and associating with her MHC proteins.
The primary determinant of blood flow to a particular region of the body during normal physiological function is
A. the radius of arterioles. B. blood hematocrit. C. the length of arterioles. D. venous return regulated by sympathetic activation. E. leakage of fluids from the capillaries.
Which of the following is a synthetic protein produced from engineered DNA that is used to determine whether cytosolic calcium fluxes are associated with signal transduction in a particular cell type?
A) sildenafil B) ionomycin C) A23187 D) fura-2 E) a cameleons
Why is DNA replication said to be semiconservative?
a. because half of the DNA in a cell comes from one parent and half comes from the other parent b. because the number of nucleotides within genes remains constant c. because each new DNA molecule is composed of one old strand and one new strand d. because the same process of DNA replication is used by all organisms