How do cytotoxic T cells recognize that a transplant is foreign?
A. Presence of different complement factors on the graft
B. Presence of different class I MHC molecules on the graft
C. Presence of different class II MHC molecules on the graft
Answer: B
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The difference between normal and sickle-cell
hemoglobin is based upon a. the number of amino acids in the molecule. b. the substitution of one amino acid for another. c. the number and orientation of the amino acid chains attached to the heme portion of the molecule. d. the number of oxygen molecules that can be carried. e. the type of bone marrow that produces it.
Human growth hormone is produced by the ______________ and erythropoietin is produced by the __________________.
a) pituitary gland; red blood cells b) pituitary gland; kidneys c) kidneys; pituitary gland d) pituitary gland; osseous tissue e) white blood cells; red blood cells
Which one of the following macronutrients stores the most amount of energy per gram?
a. fats b. carbohydrates c. nucleic acids d. proteins
Which of the following is composed of DNA?
A. centriole and chromosomes B. chromosomes and chromatin C. chromatin and nucleoli D. nucleoli and centrioles