Nonsteroid anti-inflammatory drugs such as aspirin and ibuprofen reduce fever and decrease
inflammation and pain by directly inhibiting cAMP synthesis.
____________________ Indicate whether the statement is true or false.
F, prostaglandin
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All cells in an individual organism contain the exact same DNA, but they can perform
different functions.
a. False, different cells have different functions and thus different genes. b. True, each cell only activates specific portions of its DNA. c. False, cells divide repeatedly and DNA changes occur during this time. d. True, all cells are inherited from a single parent.
When calcium levels in the blood are low, the ________ produces ________, which stimulates the breakdown of bone, releasing calcium.
A. pancreas; glucagon B. adrenal glands; norepinephrine C. pituitary gland; growth hormone D. parathyroid gland; parathyroid hormone E. adrenal glands; aldosterone
A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________. A) Platyhelminthes; a cuticle of chitin B) Nematoda; an alimentary canal C) Annelida; a body cavity D) Nematoda; a circulatory system E) Annelida; muscle in the body wall
The extracellular matrix in animals:
A. is located exclusively in connective tissue. B. is formed by many types of cells, primarily fibroblasts, on their cell surfaces. C. is a meshwork of insoluble fibrous proteins, primarily collagens, that assemble in a double helix. D. differs from one tissue to the next, affecting the expression of genes in the cells that it surrounds. E. is attached to cells by integrin junctions.