Cell surface proteins that are foreign to the body and therefore cause a response from the immune system are known as ________
Fill in the blank(s) with correct word
antigens
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What environmental factor might lead to year-round, rather than seasonal, reproductive activity?
A. a yearly rainy season B. stable food supplies C. changes in day length D. daily ocean tides E. frequent large temperature changes
Which sex chromosome combinations would you expect to find in a male calico cat?
a. XX b. XXY c. XYY d. XY
Clonal deletion of developing T lymphocytes takes place in which location(s) in the body?
A) the bone marrow B) the spleen C) the liver D) both the bone marrow and the spleen E) the thymus
Organisms called plasmodial slime molds move by which process?
A) contractile cytoskeleton movements B) growth in the direction of sunlight C) beating of cilia D) cytoplasmic streaming