22. If ethyl dimethyl amine is placed in a very acidic solution with a pH well b

Question

22. If ethyl dimethyl amine is placed in a very acidic solution with a pH well below its pKa, what will its structure be ? 23. If a DNA sequence is read as GCCTA, which base is found at the 5' end? A. guanine B. cytosine C. thymine D. adenine 24. Which of the following condensed structural formulas is a correct representation of 25. Which of the following describes the primary structure of DNA? A. The alternating chain of sugar-phosphate-sugar-phosphate etc. B. The sequence of base side chain groups read from the 5' end to the 3' end C. The sequence of base side chain groups read from the 3? end to the 5? end D. The DNA double helix is its primary structure 21. Which of the following is true with regard to the isoelectric point? A. The isoelectric point is the pH at which the overall charge is zero, due to the presence of an equal number of positive and negative charges in the molecule. B. The isoelectric point is the pH at which no charges exist in a molecule. C. The isoelectric point is the pH at which the molecule has the maximum solubility. D. The isoelectric point is another name for the pKa value.

Explanation / Answer

21) A

22) B

23) D

24) D

25) D

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