During a period of low water availability, the prokaryotic structure that would protect a cell from desiccation (drying out) is the
A. nucleus.
B. glycocalyx.
C. pili.
D. plasma membrane.
Answer: B
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Four of the five answers listed below are carbohydrates. Select the exception
a. cholesterol b. cellulose c. starch d. sucrose e. glycogen
Which most completely describes the circumstances under which yarrow will alter its phenotype?
a. temperature, soil conditions and water conditions b. soil conditions only c. being produced by sexual versus asexual reproduction d. water conditions only e. asexual reproduction, soil conditions, and water conditions
Settlers to the United States found between
____ and ____ passenger pigeons. They are extinct today. a. 15,000?25,000 b. 3?5 billion c. 50?100 million d. none; they are native to Europe e. none of these
Which of the following forms of oxygen is often used by phagocytic cells to destroy pathogens?
a) singlet oxygen b) superoxide radicals c) hydroxyl radicals d) peroxide anions