Which pathway leads to the detrital food chain?
A) W
B) P
C) R
D) I
A
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Which of the following groups of molecules commonly serve as sources of energy for animals?
A. proteins, lipids, and carbohydrates B. proteins and carbohydrates C. carbohydrates and lipids D. proteins and lipids E. carbohydrates, nucleic acids, and lipids
Transcription occurs ________ and translation occurs ________ of prokaryotic cells.
A) at the cell membrane; in the cytoplasm B) in the cytoplasm; in the nucleus C) in the cytoplasm; at the cell membrane D) in the cytoplasm; in the cytoplasm
What molecule would be considered a covalent compound?
a. oxygen (O2) b. sodium chloride (NaCl) c. water (H2O) d. a diamond (C) e. ozone (O3)
How is the development of autoimmunity normally prevented?
A) T lymphocytes that respond to autoantigens in the thymus undergo clonal deletion. B) T lymphocytes require a specific set of cytokine signals to become activated. C) Regulatory T cells suppress autoimmune responses. D) Clonal deletion of T cells and regulatory T cell suppression prevent autoreactive T cell activation. E) Clonal deletion of T cells, lack of necessary cytokine signals, and regulatory T cell suppression prevent activation of autoreactive T cells.