Degradation of organic matter is influenced by ________.
A. nutrient availability
B. the nature of the microbial community present
C. abiotic conditions
D. All of the choices are correct.
Answer: D
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Which one of the following enabled eukaryotes to evolve complex life cycles and programs of multicellular development?
A. binary fission B. complex patterns of gene regulation C. a dynamic cytoskeleton D. sexual reproduction
Before they enter the blood stream, what
modification occurs to erythrocytes?
a. they are loaded with ant-bacterial compounds b. they lose their nucleus and other organelles c. they absorb oxygen and release carbon dioxide d. they are wrapped in a double plasma membrane e. they absorb nutrients and expel wastes
The sliding filament model
a. supplies the energy needed for muscle contraction. b. provides a flexing action for the muscle fibers. c. describes the action of the actin and myosin in a muscle cell. d. explains muscle fatigue. e. only explains how muscles contract, not how they relax.
An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides
A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) species had little to no need to regulate blood pressure