E none of the above Question#20 lodination of tyrosine residues during thyroid horone synthesis occurs A.during synthesis of tyrosyl-tRNA B.co-translationally during translocation of thyroglobulin in the lumen of the endoplasmic reticulum C.afer discharge of thyroglobulin into the follicular lumen D.within the lysosome during thyroglobulin degradation at the basolateral plasm ebrane during release of 3or T4 Question#21 Which one of the following describes the relationship of thyroid follicuular and parafollicular cells? A parafollicular cells regulate thyroxine production in follicular cells B follicular cells regulate calcitonin production by parafollicular cells parafolliclar cells produce the plasaa carrier protein for thyroid hormone D.parafollicular cells regulate iodine uptake by follicular cells E.although closely juxtaposed,there is little or no direct functional interrelationship between the two cell types Interruption in the function of the hypophyseal portal system would have which one of the following effects? A.inhibition of ejection of milk from the manmary gland B.suppression of ovulation C.stimlation of thyrotropin (TSH secretion D.stimulation of epinephrine secretion by the adrenal nedulla E.suppression of bone resorption Question 23 The droplets that characteristicallyfil thecytop ofce of the adrenal fascic ous ow density lipprotein receptors B.lipofuscin C.corticosteroid D.cholesterol ester used for steroid synthesis E.lysosomal hydrolases Question#24 Steroid hormone receptors are characterized by which of the following? A.multiple transmembrane spanning domains B.association with heterotrimeric G proteins E. none of the above -------------------------------------------------------------------------------- Question # 20 Iodination of tyrosine residues during thyroid hormone synthesis occurs A. during synthesis of tyrosyl-tRNA B. co-translationally during translocation of thyroglobulin in the lumen of the endoplasmic reticulum C. afer discharge of thyroglobulin into the follicular lumen D. within the lysosome during thyroglobulin degradation E. at the basolateral plasma membrane during release of T3 or T4 -------------------------------------------------------------------------------- Question # 21 Which one of the following describes the relationship of thyroid follicuular and parafollicular cells? A. parafollicular cells regulate thyroxine production in follicular cells B. follicular cells regulate calcitonin production by parafollicular cells C. parafolliclar cells produce the plasma carrier protein for thyroid hormone D. parafollicular cells regulate iodine uptake by follicular cells E. although closely juxtaposed, there is little or no direct functional interrelationship between the two cell types -------------------------------------------------------------------------------- Question # 22 Interruption in the function of the hypophyseal portal system would have which one of the following effects? A. inhibition of ejection of milk from the mammary gland B. suppression of ovulation C. stimulation of thyrotropin (TSH) secretion D. stimulation of epinephrine secretion by the adrenal medulla E. suppression of bone resorption -------------------------------------------------------------------------------- Question # 23 The droplets that characteristically fill the cytoplasm of cells of the adrenal zona fasciculata contain A. numerous low density lipoprotein receptors B. lipofuscin C. corticosteroid D. cholesterol ester used for steroid synthesis E. lysosomal hydrolases -------------------------------------------------------------------------------- Question # 24 Steroid hormone receptors are characterized by which of the following? A. multiple transmembrane spanning domains B. association with heterotrimeric G proteins