What is thought to be true about the three domains of living things a. they diverged from a common ancestor fairly recently. b. domains bacteria and archaea evolved after the main groups of eukaryotes. c. they do not have common ancestor d. they diverged from a common ancestor before the evolution of the main groups of eukaryotes

What is the difference between an igneous, sedimentary and metamorphic rock

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

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).