enantiomers (see Figure 4./c L Nonpolar side chains; hydrophobic CH CH H3C CH CH
ID: 193821 • Letter: E
Question
enantiomers (see Figure 4./c L Nonpolar side chains; hydrophobic CH CH H3C CH CH Side chain R group) CH3 CH3 CH H O H O H O Alanine Ala or A) Valine (Val or V) (Gly or G) (Leu or L) (lle or I) CH CH Hc CH H,N+ H O Tryptophan Trp or W) Proline (Pro or P) (Met or M) Phe or F) Polar side chains; hydrophilic Since cysteine is only weaky polar, it is sometimes classified as a nonpolar amino acid NH SH CH H O H O Glutamine (Gin or Q) H O H O Cysteine (Cys or C) Asparagine Asn or N) (Ser or S) Thr or T) Tyr or Y) Electrically charged side chains; hydrophilic Basic (positively charged) Acidic (negatively charged) NH,+ NH.+ CH NH CH NH CH Aspartic acid Asp or D) Glutamic acid Glu or E) Histidine (His or H) (Lys or K) Arg or R)Explanation / Answer
Though DNA is very long but still it is found inside the tiny nucleus of the cell. The reason behind this is the compaction that DNA undergoes so that it can fit inside cell nucleus. In order to achieve a compact structure DNA forms bead like structures which bind and coil around histone proteins. This binding occurs due to the bonds that DNA forms with histone proteins. As given in figure above amino acids can be hydrophobic or hydrophilic. They can have a polar side chain or an electrically charged side chain. Now the charge on this side chain determines which type of bond is formed between histone protein and DNA.
In a similar way, E. coli proteins tend to have amino acids which are positively charged. These amino acids are able to form weak bonds with the phosphate group of DNA molecule in E. coli as the phosphate group is negatively charged.
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