12 which is NOT true of myelin? t covers all parts of the neuron, including the
ID: 81766 • Letter: 1
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12 which is NOT true of myelin? t covers all parts of the neuron, including the axon, cel body, and dendrites It influences the velocity of conduction of an electrical signal down an axon. It is formed by glial cells. D) It is a fatty membranous sheath. 13) Which is TRUE, about receptor potentials? 130 They always trigger action potentials. They propagat e without decrement C They are action potentials. They generally occur at the axon hillock of afferent neurons. hey vary in magnitude with stimulus strength 14 Which is TRUE regarding diffusion? A) depends upon the random motion of molecules It requires integral membrane proteins to occur. C It is the principal mechanism by which molecules are moved over large distances in the body. Do It requires energy in the form of ATP. Y) It results in net molecules from regions of low concentration to regions of high concentration. 15) Why are the most common receptors for hydrophilic intercellular messenger molecules? 15) heral membrane proteins intracellular proteins C) nucleic acids D) integral membrane proteins membrane E phospholipids within the 16) which structure is NOT part of the "anatomical dead space 16) B respiratory bronchiole bronchiole DO terminal bronchiole trachea 1 Which of the following is not true of a polar chemical bond? It has no net electrical charge. lt has opposite electrical charge at each end. D) It is covalent.Explanation / Answer
All the circled answers are correct except for
Question 20. The answer is C. Proteins are not composed of nucleic acids, but are made up of amino acids joined by peptide bonds.
Question 22. Has no right answer. Carbohydrates make up only 5 % of the average human body mass, while proteins and fat make up 17% each. Water makes up 60% of the body.
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