Accessory structures of the skin include all of the following except
A) hair follicles.
B) sebaceous glands.
C) sweat glands.
D) the epidermis.
E) lamellar corpuscles.
Answer: D
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Match each class of biomolecules to the correct statement about it.
1. Glucose and ribose are examples; these molecules provide energy or structure. 2. ATP and DNA are examples; they transfer energy and encode genetic information. 3. Composed of units called amino acids, these can be linked into chains over 100 peptides long. 4. Triglycerides and steroids are members of this group. As a class they are hydrophobic. A. carbohydrates B. lipids C. proteins D. nucleotides
The bacterium that causes tetanus produces a toxin that affects the central nervous system and skeletal muscles, producing powerful tetanic contractions of the skeletal muscles. The toxin probably acts by
A) Increasing the amount of acetylcholinesterase in the synapse. B) Making the cells less permeable to sodium ions. C) Increasing the amount of potassium ion in the intercellular fluid. D) Making the cell membranes more permeable to calcium ion. E) Competing with acetylcholine for receptors at the motor end plate.
The phase when the mentor no longer needs the ongoing support of the protégé is called
A. Relationship initiation B. Redefinition C. Cultivation D. Separation E. None of the above
What is a lever?
A. The pivot point that does not move B. The force applied to lift the weight C. The weight to be lifted D. A rigid object used to lift something