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20) Which of the following is not a tropic hormone?


a) Thyroid-stimulating hormone


b) Adrenocorticotropic hormone


c) Luteinizing hormone


d) An endorphin


e) Follicle-stimulating hormone


21) Which of the following react(s) with sunlight to produce ozone?


a) Chlorofluorocarbons


b) Carbon dioxide and water vapor


c) Nitric oxide and hydrocarbons


d) Sulfur dioxide, nitric oxide, and carbon dioxide


e) Chloride ions and molecular oxygen


22) In a positively regulated operon, the _______ binds to the ______ to allow transcription to occur.


a) corepressor; repressor


b) inducer; repressor


c) transcriptional activator; operator


d) inducer; operator


e) transcriptional activator; repressor


23) Meiosis I produces:


a) 2 genetically unique haploid cells.


b) 2 genetically identical diploid cells.


c) 4 genetically identical haploid cells.


d) 4 genetically unique haploid cells


e) 2 genetically identical haploid cells.


24) What is the primary function of parietal cells in the stomach

Help with bio?
22-B
Reply:Sorry, I'm not sure about the others , but I am sure for the meiosis question.





23) Meiosis I produces:


a) 2 genetically unique haploid cells.
Reply:20. d


21. b


22. ?


23. a


24. ?
Reply:22. D 24. To produce acids and protect the stomach wall from damage.
Reply:Ans 20 . d) an endorphin.





Ans 21 . e)chloride ions and molecular oxygen.





Ans 23 . e) two geneticaly identical haploid cells.





Ans 24 . may b to secrete gastric hydrochloric acid in the stomach or to secrete pepsin the active form of d enzyme pepsinogen.
Reply:I'm not an expert,sorry, but I can ge you started: