The immune response is directed against an entire molecule
Indicate whether this statement is true or false.
FALSE
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Which statement best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
How might absorption of organic compounds into clays assist in their aggregation and organization
into membrane-bound protocells?
a. Clays contain many minerals in extremely thin layers and readily repel ions, forcing multiple chemical interactions. b. Clays are highly structured, contain water, and store potential energy that could drive the chemical reactions forward. c. Clays lack water, forcing the concentration of the organic molecules and thus driving multiple interactions. d. Clays are extremely resistant to temperature changes and thus would insulate the organic compounds from temperature changes in the atmosphere. e. None of the above statements accurately explain clays’ possible roles in the formation of protocells.
An organelle found in plant cells and some members of the kingdom Protista but not in animal cells is a
A. chloroplast. B. lysosome. C. Golgi apparatus. D. rough endoplasmic reticulum. E. mitochondrion.
Anandamide is a substance made in the body that is the equivalent of the active component of
A) heroin. B) chocolate. C) marijuana. D) barbiturates.