Which of the following statements is mort correct regarding the difference between primary and secondary active transport. 1. active primary transport is a form of passive transport while secondary active transport is not. 2. energy is reqjluired for primary active transport, but not secondary active transport. 3.primary active transport moves solutes in opposite directions while secondary transport moves solutes in same direction. 4.primary active transport is driven by secondary active transport. 5. in primary active transport, the transport protein gets phosphorylated, in secondary active transport, the transport protein is not phosphorylated

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).