The part of a cell that is most like our organs is the ________.
A. organelle
B. organic macromolecule
C. atom
D. organism
Answer: A
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The brain has about one hundred million neurons.
Answer the following statement true (T) or false (F)
A gene is
A. a DNA sequence that contains the information for producing one type of protein. B. the collection of all of the protein-encoding DNA sequences on a particular chromosome. C. an amino acid sequence that contains the information for producing a particular DNA sequence. D. a structure that contains chromosomes.
During the plateau phase of the action potentials of myocardial contractile cells, which ion(s) is/are crossing the membrane?
A) K+ only B) Na+only C) both Na+ and K+ D) Ca2+ only E) both Ca2+ and K+
Which of the following may explain why self-tolerance may fail?
A. A noncirculating antigen becomes exposed to the immune system. B. Antibodies produced against foreign antigens cross-react with self-antigens. C. Antibodies directed against other antibodies are produced. D. All of the choices are correct.