The reactivity of an atom arises from
a. the average distance of the outmost electron shell from the nucleus.
b. the existence of unpaired electrons in the valance shell.
c. the sum of the potential energies of all the electron shells.
d. the potential energy of the valance shell.

Classify the structures as homologous or analogous, depending on their structure and function.

What are the 3 types of artificial cloning

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).