How is the phloem in a leaf related to the roots of the plant? a. cells that contain sugar move between the leaf and roots within the phloem. 

b. chloroplasts that make sugar move through phloem cells to the roots. 

c. water in the phloem cells comes to the leaf from the roots. 

d. sugar made in the leaf is carried to the roots by cells in the phloem.

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

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).

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations