What are the two major factors determining the distribution of terrestrial biomes? what are the two major factors determining the distribution of terrestrial biomes? temperature and light temperature and rainfall light and rainfall plants and animals temperature and plants?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

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).

Located at the epidermal-dermal junction of the skin. select all true statements about the transformation of melanocytes into abnormal cell