A single heavy chain of an immunoglobulin molecule has , whereas a single light chain of an immunoglobulin molecule has . Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices six constant domains and two variable domains; two constant domains and two variable domains two constant domains and one variable domain; one constant domain and two variable domains three constant domains and one variable domain; one constant domain and one variable domain one constant domain and one variable domain; three constant domains and one variable domain

Suppose you use three different scale to weigh a bag of oranges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of oranges is 2.153 lb. which of the following best decribes these results?

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).

What does the number 18.9984 represent in the image?