Schleiden and Schwann stated the "cell theory," which in its modern form says:
A. all organisms are composed of one or more cells, all cells require oxygen and all cells arise by division of other cells.
B. all organisms are composed of one or more cells, all cells are the smallest living things and all cells arise by division of other cells.
C. all organisms are composed of one or more cells, all cells arise spontaneously and all cells vary in size and shape.
D. all cells will arise spontaneously, all cells require oxygen and all cells are composed of one or more cells.
B
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The enzyme that digests protein is ____
a. ghrelin b. chyme c. pepsin d. sulfuric acid e. lipase
In all organisms, hereditary information is encoded within __________ molecules
a. DNA b. RNA c. protein d. lipid e. carbohydrate
A double-stranded, enveloped DNA virus that contains reverse transcriptase belongs to which family?
A. Hepadnaviridae B. Poxviridae C. Picornaviridae D. Retroviridae E. Rhabdoviridae
A pressurized airplane cabin and an oxygen tent over a patient in a hospital both address the need of a person for oxygen. How do these compare?
Select one: a. The oxygen tent increases the air pressure to increase the PO2. b. Airplane cabin pressure lowers the partial pressures for normal breathing. c. Both use the same mechanism to force hemoglobin to increase affinity for oxygen. d. The oxygen tent increases concentration of O2 while the airplane maintains total air pressure without changing concentrations. e. Both increase the PO2 in order to force the exchange of oxygen for carbon dioxide.