21-At 50% saturation a population of high-affinity receptors will bind ligand mo

Question

21-At 50% saturation a population of high-affinity receptors will bind ligand molecules than a population of low affinity receptors for the same messenger molecule A. fewer B. more C. the same number 22. The presence of nicotine (an acetylcholine agonist) will acetylcholine receptors at the neuromuscular junction A. reverse B. inhibit C. increase D. not change 23. The post-synaptic area at the neuromuscular junction of muscle fibers is known as the motor A. unit B. pool C. point D. end plate 24. Steroid hormones like estrogen travel through the blood stream A. bound to plasma proteins B. dissolved in the plasma C. in lipid vesicles D. inside red blood cells 25. The activation of Adenylyl Cyclase to produce cAMP is facilitated by a receptor that is A. G-protein coupled B. coupled to a JAK kinase C. a tyrosine kinase D. a ligand-gated ion channel 26. In the peripheral nervous system, a bundle of axons is referred to as a A. nerve fiber B. nerve C. tract D. dendrite 27. Materials are transported between the neuron cell body and axon terminal by molecular pathway motors along a A. actin B. dynein C. microtubule D. diffusion-based

Explanation / Answer

High affinity receptors usually bind more ligand molecules than low affinity ones irrespective of the time taken. The presence of ample amount of agonist will down regulate the number of Receptors. Motor end plate is the name given to the post Synaptic area where the muscle fibre meets the neuron. Steroid hormones travel in the blood bound to plasma proteins. The activation of adenyl cyclase to produce cAMP is mediated by a receptor which is a G protein coupled receptor. A nerve is the collection of axons in the peripheral nervous system. In the CNS, the same is called a tract. Dynein, Kinesin and Myosin superfamilies are essential Neuronal motors. They regulate plasticity, morphogenesis and other functions.

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