The classic pathway of complement activation begins when the protein C1 binds to
A) the cell wall of bacteria.
B) the plasma membrane of bacteria.
C) two antibodies attached to an antigen.
D) a cell surface antigen.
E) a plasma protein.
C
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The opposing roles of the thyroid and parathyroid maintain the balance of calcium and phosphate ions in the blood. What will happen if the parathyroid gland develops a defect that prevents PTH secretion?
A. The amount of calcium ions in the blood will decrease and the amount of phosphate ions will increase. B. The amount of calcium ions in the blood will increase and the amount of phosphate ions will decrease. C. The amount of calcium ions and phosphate ions in the blood will decrease. D. The amount of calcium ions and phosphate ions in the blood will increase.
The measurement of brain activity is recorded by a procedure known as the ________.
Fill in the blank(s) with the appropriate word(s).
What part of the nerve cell receives information from other cells and sends impulses toward the soma?
A) dendrites B) soma C) axon D) synaptic terminal
The sequence of nucleotides in a messenger RNA molecule is needed to determine the sequence of
A. amino acids in a protein. B. nucleotides in the anticodons of tRNA. C. nucleotides in a gene. D. amino acids in DNA. E. codons in DNA.