The clonal selection theory implies that
A. related people have similar immune responses.
B. antigens activate specific lymphocytes.
C. only certain cells can produce interferon.
D. memory cells are present at birth.
E. the body selects which antigens it will respond to.
B. antigens activate specific lymphocytes.
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The ________ is the federal agency that provides a majority of federal funding for medical research in the United States and oversees all federally funded medical research in the United States
A) Food and Drug Administration B) National Institutes of Health C) Environmental Protection Agency D) U.S. Department of Agriculture E) Department of Environmental Protection
Which of the following is a characteristic of sodium ion?
A) It is a cation. B) It is present primarily in the intracellular fluid. C) It shifts out of the blood by active transport. D) Diuretic drugs lead to high blood levels.
When building a nest, a female Fisher's lovebird cuts long strips of vegetation and carries them to the nest site one at a time in her beak. The female peach-faced lovebird cuts short strips and carries them to the nest tucked under her back feathers
Hybrid female offspring cut intermediate-sized strips and attempt to tuck them under back feathers before carrying them in their beak. What does this demonstrate about behavior? A) Behavior can be learned from parents. B) There is a genetic basis to behavior. C) Environment is important in forming behaviors. D) Lovebirds can be trained easily.
Some activators do not have an activating domain. How can they function as activators?
What will be an ideal response?