NH,CH.NH-CHCNH CHo HOOCCH CH,SH CH A. Ala-Cys-Asp B. Asp-Cys-Ala C. Glu-Cys-Ala

Question

NH,CH.NH-CHCNH CHo HOOCCH CH,SH CH A. Ala-Cys-Asp B. Asp-Cys-Ala C. Glu-Cys-Ala D. Ala-Cys-Glu 9. Which of the following is true of the base content of DNA? A. moles of cytosine moles of thymine B. moles of cytosine moles guanine C. moles ofcytosine = moles of adenine D. none of the above 20. Which of the following best describes the functional group of anhydrides? A. two carbonyl groups bonded to the same oxygen atom B. two carboxyl groups bonded directly to cach other C. two carboxyl groups bonded to the same oxygen atom D. two carbonyl groups bonded directly to each other 21. Secondary messengers perform which of the following functions? A. transmission of a message from the cell surface to its interior B. transmission of a message from one cell to another C. both a and b D. neither a nor b 22. What name is given to the molecule on which the enzyme works? A. substrate B. cofactor C. isozyme D zymogen 23. Which of the following is where genetic information is located? chromosomes B.endoplasmic reticulum C. histones D. ribosomes 24. Which of the following is generally called "good cholesterol"? A. chylomicrons B. HDL D. VLDL LDL 25. What is an apoenzyme? A. the protein only part of an enzyme B. the inactive form of an enzyme nonprotein part of an enzymeD. an enzyme made entirely of pro Copyright Cengage Leaming. Powered by Cognero

Explanation / Answer

Ans 19 B) Moles of cytosine = mole of guanine

The DNA has four kinds of nitrogenous bases , adenine , thymine , cytosine and guanine. Cytosine is bonded with guanine by three hydrogen bonds and adenine with thymine by two hydrogen bonds, So the number of moles of bases of these pairs are always equal.

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