Which material in skin provides protection from abrasions, water damage, and microorganism entry?
A. Sweat
B. Salt
C. Lysozyme
D. Sebum
E. Keratin
Answer: E
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What is the main reason for using food webs instead of food chains in analyzing ecosystems?
I) Most organisms eat more than one type of food. II) Most organisms feed at several trophic levels. III) The decomposition cycle needs to be shown. A) only I B) only II C) only III D) only I and II E) I, II, and III
The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins. B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. C. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer. D. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.
The ____ are considered to be blood reservoirs
a. arteries b. arterioles c. capillaries
d. heart e. veins
Which of the following is NOT involved in the regulation of the lac operon?
A) an inducer B) a repressor protein C) an iRNA D) glucose E) cyclic AMP