TEST 2 BIO 242

TEST 2 BIO 242 Students MUST enter their name and ID number on BOTH the question and answer (scantrons) sheets of each exam in the correct spaces. Also students must enter the correct version of their tests on their answer (scantrons) sheet in the correct space, failure to do so will result in an automatic zero for that exam. Choose the best answer. Fill in the appropriate bubble. Make sure ALL electronic equipment is put away. For true, fill in a. For false, fill in b. 1) ________ form channels between cells, allowing ions and small molecules to diffuse directly from one cell to the other. A) Connexins B) Cadherins C) Dyneins E) Tubulins 2) Which of the following components of the plasma membrane forms ion channels? A) phospholipids B) cholesterol C) membrane carbohydrates D) membrane proteins 3) T/F Movement of K+ into the cell requires energy expenditure, whereas movement of Na+ into the cell does not. 4 ) The autonomic nervous system is A) part of the somatic nervous system. B) considered to be the involuntary branch of the efferent division of the peripheral nervous system. C) part of the central nervous system. D) D) all of these answers. 5) Non polar molecules are capable of crossing the membrane ________. A) directly across the lipid bilayer B) only through specific protein channels C) only with the addition of energy D) indirectly by moving across a carrier protein 6) The fact that a cell has an electrical potential difference across its membrane makes that cell ________. A) depolarized B) hyperpolarized