Biology Past Paper PDF

During depolarization, membrane potential shifts from 1. Negative to positive 2. Positive to negative 3. Remains unchanged 4. None of the above ***1 point*** During repolarization, membrane potential shifts from 1. Negative to positive 2. Positive to negative 3. Remains unchanged 4....

During depolarization, membrane potential shifts from 1. Negative to positive 2. Positive to negative 3. Remains unchanged 4. None of the above ***1 point*** During repolarization, membrane potential shifts from 1. Negative to positive 2. Positive to negative 3. Remains unchanged 4. None of the above ***1 point*** During drepolarization, which ions move inside the cell from outside 1. Na+ 2. K+ 3. Both a and b 4. None of a and b ***1 point*** Which units of muscle cannot be used for force measurements 1. Myotube 2. Myofiber 3. Myoblast 4. None of the above ***1 point*** Neuromuscular junction is made at junction of 1. Muscle and motor neuron 2. Glia and motorneuron 3. Hippocampal neurons and osteoblasts 4. None fo the above ***1 point*** Bungarotoxin causes paralysis by blocking \_\_\_\_\_\_\_\_\_\_ 1. Potassium channels 2. Acetylcholine receptor 3. Both a and b 4. None of the above ***1 point*** For myotubes cultured on cantilever devices, to move cantilevers, which property of cantilevers should be similar to myotubes 1. Stiffness 2. Color 3. Weight 4. Width ***1 point*** Hippocampus is associated with 1. Movement 2. Color Vision 3. Learning and memory 4. Vocation ***1 point*** \_\_\_\_\_\_\_\_\_\_ is a pungent pain-producing compound found in plants of the capsicum family; it exerts excitatory, desensitizing, and toxic effects on a subset of sensory neurons, including the polymodal nociceptor population. 1. Capsaicin 2. TTX 3. Digitoxin 4. Xanthin ***1 point*** \_\_\_\_\_\_\_\_\_\_\_ blocks sodium channel. 1. TTX 2. 4AP 3. Calcium 4. Free radicals