A comparative morphologist would be most likely to study ________
a. theological writings about the origins of life
b. the worldwide distribution of cactus-like plants
c. the distribution of earthquakes and volcanoes
d. differences and similarities in the structures of organisms
d
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The glandular secretions involved in digestion that would most likely be released as inactive precursors are
A. acid-neutralizing bicarbonate B. protein-digesting enzymes C. fat-solubilizing bile salts D. carbohydrate-digesting enzymes
The major constituent of regular dense connective tissue is:
a. adipose cells. b. collagen fibers. c. reticular fibers. d. macrophages. e. a semifluid matri
Extraembryonic membranes develop in
A) mammals, but not birds or lizards. B) birds, but not mammals or lizards. C) lizards, but not mammals or birds. D) mammals and birds, but not lizards. E) mammals, birds, and lizards.
When adrenaline binds to adrenergic receptors on the surface of a muscle cell, it activates a G protein, initiating an intracellular signaling pathway in which the activated ? subunit activates adenylyl cyclase, thereby increasing cAMP levels in the
cell. The cAMP molecules then activate a cAMP-dependent kinase (PKA) that, in turn, activates enzymes that result in the breakdown of muscle glycogen, thus lowering glycogen levels. You obtain muscle cells that are defective in various components of the signaling pathway. Referring to Figure Q16-36, indicate how glycogen levels would be affected in the presence of adrenaline in the following cells. Would they be higher or lower than in normal cells treated with adrenaline? A. cells that lack adenylyl cyclase B. cells that lack the GPCR C. cells that lack cAMP phosphodiesterase D. cells that have an ? subunit that cannot hydrolyze GTP but can interact properly with the ? and ? subunits