Which flow chart best shows the relationship between the cell structures that are listed?
O gene DNA chromosome → nucleus
gene → chromosome → DNA nucleus
DNA gene → chromosome → nucleus
DNA chromosome → gene → nucleus

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 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).