Sounds
a. are waves of compressed air.
b. are detected by mechanoreceptors.
c. may be measured, with respect to their
loudness, in decibels.
d. that vary by one decibel can be
differentiated by the human ear.
e. include all of these.
E
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Within a single neuron, what is the direction of an impulse?
a. dendrite ? axon ? cell body b. axon ? dendrite ? cell body c. dendrite ? cell body ? axon d. cell body ? dendrite ? axon e. cell body ? axon ? dendrite
The rate of transpiration decreases under which of the following conditions?
a. increased wind b. increased humidity c. increased temperature d. presence of sunlight e. an increase in dry air
Which of the following is not found in DNA?
A) uracil B) cytosinne C) adenine D) thymine
Biologists use the fluid mosaic model to describe membrane structure. Which statements about the fluid mosaic structure of a membrane are correct? Select the three correct statements.
A. Because membranes are fluid, membrane proteins and phospholipids can drift about in the membrane. B. The framework of a membrane is a bilayer of phospholipids with their hydrophilic heads facing the aqueous environment inside and outside of the cell and their hydrophobic tails clustered in the center. C. The diverse proteins found in and attached to membranes perform many important functions. D. The kinky tails of some proteins help keep the membrane fluid by preventing the component molecules from packing solidly together. E. Membranes include a mosaic, or mix, of carbohydrates embedded in a phospholipid bilayer.