Steroid hormones generally bind with receptors inside target cells and control the rate of formation of mRNAs that lead to the synthesis of proteins.
Answer the following statement true (T) or false (F)
True
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Which of the following statements about the response of arteriolar smooth muscle to changing oxygen partial pressures is TRUE?
A. Systemic arterioles respond to a decrease in PO2 by constricting, but pulmonary arterioles dilate in response to decreased PO2. B. Both systemic and pulmonary arterioles respond to a decrease in PO2 by dilating. C. Both systemic and pulmonary arterioles respond to a decrease in PO2 by constricting. D. Changes in PO2 do not affect arteriolar smooth muscle in the pulmonary system. E. Systemic arterioles respond to a decrease in PO2 by dilating, but pulmonary arterioles constrict in response to decreased PO2.
What is the correct order of occurrence for the steps of protein synthesis? 1. mRNA is produced in nucleus. 2. Ribosome moves along mRNA. 3. DNA uncoils for transcription. 4. Polypeptide is produced. 5. tRNA brings amino acids to ribosome. 6. mRNA moves to ribosome
A) 3, 1, 6, 2, 5, 4 B) 2, 4, 6, 1, 3, 5 C) 2, 1, 5, 4, 3, 6 D) 3, 5, 1, 6, 2, 4 E) 1, 5, 3, 4, 2, 6
The giant protein titin maintains the organization of the ________ assisting in muscle stretching.
A) A band B) I band C) Z disc D) M line
Most hypothalamic and pituitary hormones are:
a. amino acids b. peptides / proteins c. steroids d. eiconsanioids e. catecholamines