Hormone K101 affects a target cell via a second messenger molecule called K103.
ID: 99489 • Letter: H
Question
Hormone K101 affects a target cell via a second messenger molecule called K103. To investigate the greatest effect of hormone K101, the scientist should _____. A) apply K101 to the extracellular fluid surrounding the cell B) inject K101 into the cytoplasm of the cell C) inject K101 info the nucleus D) inject K103 into the nucleus Which hormones enter cells and turn genes on and off? A) steroid and phospholipid hormones B) thyroid and peptide hormones C) peptide and phospholipid hormones D) steroid and thyroid hormones E) steroid and peptide hormones the K^+ concentration in the cytoplasm of a nerve cell with a resting membrane potential of -70mV were elevation normal, what would the new resting membrane potential be? -69 mV or higher -70 mV 0 mV -71 mV or lowerExplanation / Answer
3. Option A is correct. Here K101 is primary messenger and primary messenger act on the outer surface of the cell which causes release of second messanger inside the cell. Thus primary messenger is always extracellular and secondary messengers are always intracellular. Hence to investigate the greatest effect of K101, the scientists should apply K101 to the extracellular fluid surrounding the cell.
4. Option D is correct. The steroid and thyroid hormones enter the cell and turn genes on and off by binding with steroid receptor and thyroid receptors respectively. These receptors are DNA-binding transcription factors that function as molecular switches and turn genes on and off. Although peptide hormones also regulate gene expression but do not enter into the cell. Peptide hormones act by binding with the receptor from outside the cells.
5. Option A is correct. The resting potential is -70mV which is due to the more negative charge inside the nerve cell. If potassium ion concentration inside the nerve cell (cytoplasm) is elevated then the negative charge will be reduced because potassium charge has positive charge. Hence the modified resting potential will be -69mV or higher.
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