The pH scale measures the
A) number of molecules of salts dissolved in water.
B) number of hydroxide ions in water.
C) concentration of hydrogen ions in solution.
D) strength of an electrical current that a solution carries.
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Question 2) An important mechanism that controls metabolic pathways under physiological
conditions is
A) negative feedback. B) genetic control.
C) signal transduction. D) positive feedback.
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Question 3) The dermis is composed largely of
A) dense irregular connective tissue. B) dense regular connective tissue.
C) stratified squamous epithelium. D) stratified columnar epithelium.
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Question 4) _______ produce connective tissue fibers.
A) osteoclasts B) Mast cells C) Macrophages D) Fibroblasts
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Question 5) An active site of an enzyme is
A) the part of an enzyme that combines with a substrate.
B) the part of a substrate that combines with an enzyme.
C) a sequence of DNA nucleotides that encodes a protein molecule.
D) the part of the enzyme that binds ATP.
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Question 6) Which action is the main function of the digestive system?
A) Providing oxygen for the extraction of energy from nutrients
B) Absorption of nutrients
C) Movement of body parts
D) Formation of cells
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Question 7) As cells are pushed from the deeper portion of the epidermis toward the surface,
A) they become dermal cells. B) they die.
C) they divide continually. D) their supply of nutrients improves.
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Question 8) Consider the following list of commonly found items and their pH values:
Which of the following choices includes all acids?
A) Beer, butter, and baking soda
B) Tomatoes, egg whites, and baking soda
C) Vinegar, grapes, tomatoes, and coffee
D) Egg whites, baking soda, milk of magnesia, and bleach
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Question 9) Which of the following are cellular fragments?
A) Lymphocytes B) White blood cells
C) Red blood cells D) Blood platelets
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Question 10) In the inherited disease ichythyosis, the skin is rough, brown, and very scaly because the
uppermost layer cannot peel off as easily as skin normally does. The part of the skin that
is affected is the
A) subcutaneous layer. B) dermis.
C) basement membrane. D) epidermis.
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