What can you conclude is one limitation of the arrangement of glucose molecules that gives chitin and cellulose their strength? a) it does not allow for storage of energy and, therefore, provides little nutritional value. b) it does not allow for the accumulation of glycogen and, therefore, limits the organism's mobility. c) it does not allow for the elimination of waste material and, therefore, causes higher energy use. d) it does not allow for a bonding with hydrogen and, therefore, creates limitations on height.

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).