![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A. The R group of methionine is —CH 2—CH 2,—S—CH 3, and its molecular formula is that C5H11O2NSB. tyrosine is almost insoluble in water, while arginine is soluble A. The R group of methionine is —CH2—CH2,—S—CH3, then its molecular formula is C5H11O2NS B. Tyrosine is almost insoluble in water, whereas arginine is soluble in water, a difference caused by differences in R groups C. n amino acids have a total of m amino groups, then the number of amino groups in a polypeptide condensed from these amino acids must be m-n D. If the molecular formula of sweet peptide is C13H16O5N2,, the sweet peptide must be a dipeptide. Why sweet peptide two N must be dipeptide? Can not be a peptide?
0
Is the electrolyte an ionic compound? Is the ionic compound an electrolyte?
0
RELATED INFORMATIONS
- 1. How to prepare magnesium hydroxide with strong and weak bases? Find the chemical equation.
- 2. Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you give a counterexample? Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you cite a counterexample? Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you give us a counterexample?
- 3. Judgement: Organic matter with one or more CH 2 groups are homologues. Judgement: Organic compounds with one or more CH 2 groups are homologues.
- 4. In homologues, the matter which conforms to the same general formula and whose molecular composition differs by several CH2 groups is not necessarily homologues.
- 5. Is it correct to say that two organics that differ in molecular composition by one'CH2' atom must be homologues?
- 6. In maximum number of carbon atoms in the same plane is Why is 5 instead of 8, the next 5 is which five. In maximum number of carbon atoms in the same plane is Why is 5 instead of 8, the next five is which five. The maximum number of carbon atoms in the same plane is Why is 5 instead of 8, the next 5 is which five.
- 7. It is composed of -C6H6,-C6H4-,-OH,-CH2- four kinds of atomic groups, which belong to phenolic substances. It is compose of -C6H6,-C6H4-,-OH,-CH2- four kinds of atomic groups, which belong to phenolic substance.
- 8. Is the carbon atom in CH2=CH-CH2-CH=CH2 coplanar? RT
- 9. (Chemistry 1) After the excess iron powder is put into the copper sulfate solution containing sulfuric acid and fully reacted, the solution is filtered, After the excess iron powder is put into the copper sulfate solution containing sulfuric acid and fully reacted, the solution is filtered, and the mass of filter residue is equal to the mass of iron powder put in. What is the ratio of sulfuric acid and copper sulfate in the original mixed solution?
- 10. The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered paper was The excess iron powder was put into the copper sulfate solution, and after the reaction, the excess iron powder was filtered, and the residual substance on the filter paper was
- 11. Propylene, why must be written as CH2=CH-CH3, can not be written as CH3-CH=CH2
- 12. CH2=CH-C≡C-CH3 has several atoms coplanar, why? Tomorrow's the exam. Come on, CH2=CH-C≡C-CH3 How many atoms are coplanar? Tomorrow's the exam. Come on,
- 13. -(CH2)16 CH3!
- 14. How to read CH2Cl-CH2-CH2-CH2-CH2-CH3? And this CH3-CHCl-CH2-CH2-CH2-CH3
- 15. - How to read the group CH2-CN?
- 16. The composition of a hydrocarbon is C15H24, and its molecular structure is very symmetrical. It is proved that there are only three groups in the hydrocarbon: vinyl (-CH=CH2) methylene (-CH2 The composition of a hydrocarbon is C15H24, and the molecular structure is very symmetrical. The experiment proves that there are only three groups in the hydrocarbon: Vinyl (-CH=CH2) methylene (-CH2-) methylene () And the vinyl and the methylene must be linked by methylene. When the hydrocarbon is a monocyclic structure, the vinyl in the molecule And the number of methylene groups is A.2,3 B.3,3 C.4,6 D.3,6
- 17. Ammonium salts decompose when heated, but not all produce ammonia Give me an example of why. Xie
- 18. The ammonium salt produced by a reaction in a chemical equation is written in the case of ammonia and in the case of ammonium salt (a reaction in solution). For example, AlCl3+3NH3·H2O ===? The ammonium salt produced by a reaction in a chemical equation is written in the case of ammonia and in the case of ammonium salt (a reaction in solution). Such as AlCl3+3NH3·H2O===?
- 19. The chemical equation of ammonia production from ammonium salt and alkali is used in laboratory.
- 20. Inspection of ammonium salt Ammonium salt can be tested by adding sodium hydroxide solution for co-heating. Does the solution have to be added? Is it possible to add sodium hydroxide to the solid for co-heating? Is it possible to add other bases? Or must it be strong alkali? Inspection of ammonium salt Ammonium salt can be tested by adding sodium hydroxide solution for co-heating. Does the solution have to be added? Is it okay to add sodium hydroxide to the solid for co-heating? Is it possible to add other bases? Or must it be strong alkali?