The integumentary system functions in
a. protection.
b. support.
c. covering.
d. contraction.
e. resistance.
Answer: c
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The age of the Earth according to modern estimations is about
A. 8 billion years. B. 4.6 billion years. C. 3.5 billion years. D. 1.5 billion years. E. a few thousand years.
Which scientist was a skilled lens maker and first observed cell structure in protists?
a. Robert Hooke b. Theodor Schwann c. Anthony van Leeuwenhoek d. Matthias Schleiden
Each of the following is a characteristic of hormones except
A) synthesis by endocrine tissue cells. B) secretion directly into the bloodstream. C) having a hormone-specific lifespan in the blood ranging from seconds to hours. D) interacting with specific receptors on cells in target tissues throughout the body. E) All are characteristics of endocrine hormones.
Answer the following questions true (T) or false (F)
1. To move a molecule into a cell against the concentration gradient requires energy. 2. Exocytosis is an example of active transport of a substance into the cell. 3. Phagocytosis is an example of passive transport.