e) sone of the above \"A\" is the one lener coude for which amino a) Asparagine
ID: 886635 • Letter: E
Question
e) sone of the above "A" is the one lener coude for which amino a) Asparagine b) Aspartabe c) Arginine d) Alanine e) None of the above 7 Hydrogen bonds can form betwcen the prstom of'a hydroxyl group a) the proton of an amino group and the proton of a b) the proton of an amino group and oxygen of a the proton of s bydof group carbonyl group and the oxygen of a carbonyl group d) all of the above e) b and c ne oxygen atom ofa water molecule can form a hydrogen bond with a the oxygen of a carbonyl group b. the oxygen of a hydroxyl group c the nitrogen of an amino group d. none of the above 9. if a weak acid has a pKaof6,itcan buffer solutions with pHs ranging from- a. 2 to 10 b. 4 to 8 c. 3 to 9 d. 5 to 7 e. All of the above
Explanation / Answer
Question 6:
The correct answer would be option D Alanine. This is because, according to different sources the one code letter for the rest of the aminoacids are:
Asparagine (N); Aspartate (D); Arginine (R).
Question 7:
A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highlyelectronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom.
These hydrogen-bond attractions can occur between molecules (intermolecular) or within different parts of a single molecule (intramolecular). The hydrogen bond (5 to 30 kJ/mole) is stronger than a van der Waals interaction, but weaker than covalent orionic bonds. This type of bond can occur in inorganic molecules such as water and in organic molecules like DNA and proteins.
According to this definition, the correct option would be option e) b and c. Option a) it's not correct because it stated that the hydrogen bond can be formed between two hydrogens of differents molecules. And this do not occur. It only occurs between one hydrogen and an electronegative atom.
Question 8:
Following the deffinition of hydrogen bond in the above question, the correct option would be Option d. none of the above. Once again the hydrogen bond it's not a bond between two electronegatives atoms, it's a bond between one electronegative atom and one hydrogen bounded to a highlyelectronegative atom. And in these option you only see bonds between two electronegatives atoms.
Question 9.
A buffer solution of a weak acid, usually have a constant value of pH. This is because, the weak acids are not entirely dissociated and still have all of their hydrogens atoms in the form potentials hydrogens ion. So even when you mix it with it's salt, or add large quantities of hydroxil ions, it still retains a constant pH. That's the deffinition of a Buffer solution in general.
According to this, the correct option would be Option d, from 5 to 7.
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