40) Tyrosine kinases are examples of which of the following types of receptors?

Question

40) Tyrosine kinases are examples of which of the following types of receptors? A. G protein-coupled receptors B. Voltage-sensitive ion channels C. Channel-linked receptors D. Ligand-gated ion channels E. Enzyme-linked receptors 41) Which of the following types of SHORT-distance messengers influences cells that released them A. Paracrine B. Autocrine C. Hormones D. A &B; E. A, B&C; 42) Which of the following neurons is named by the STRUCTURAL classification method? B. Motor neurons C. Sensory neurons D. Multipolar neurons E. Association neurons Which of the following statements is CORRECT about EPSPs? A. Examples of graded potentials that cannot be added to one another B. Examples of graded potentials going toward threshold potentials to induce the generation of APs C. Examples of graded potentials going away from threshold potentials to prevent the generation of D. A& B E. A B& C ) Which of the following is used as a basis of classification for monosynaptic and polysynaptic reflexes? A. Developmental pattern, innate B. Efferent division controlling effector C. Level of neural processing D. Nmber of synapses in the pathway E. Developmental pattern, conditioned Which of the following drives PASSIVE transport mechanisms? A. B. C. D. E. Concentration gradients Cellular energy ATP A & B A, B & C Which of the following hormones is involved in a POSITIVE feedback mechanism? A GHRH B. Oxytocin C. ACTH D. Vasopressin (or ADH) E. GHIH Which of the following types of membrane potentials displays a POSITIVE feedback mechanism? A. B. C. D. E. Action potentials Graded potentials Resting membrane potentials A& B A, B&C;

Explanation / Answer

Question 40

Answer is A

tyrosine kinase is type of Gprotein couple receptor. Because it is transmembrane protein it cotains extracellular domain and intracellular domain. Their action is mainly carried throgh phosphorylation.

41

Answer is A

paracrine signalling molecules communicate only neaby cells. it is maily due to not entering into the blood and the signaling molecule are rapidly degraded by extracellular molecules.

42

Answer is D

The structural classification of neurons mainly depends on the presence of number of dendrites. Multipolar neurons have more dendrites.

43.

Answer is B

graded pottential is responsible for development of threshold potential. That so induce threshold potential is required for development of action potential.

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