What is histidine's approximate pl? COOH H3N-CH CH₂ H COO- HN-CH CH₂ H N COO H3N-CH CH2 H N COO- H₂N-CH CH₂ H N bbbb 2 4 6 C 7.5 CH CH CH pKR. C H N H N H N H 2 H 6 9 +1 +2 0 H -1 CH 9

HO 9. In the DNA double helix, why are purine bases on one DNA strand never paired with other purine bases on the opposite strand? There is more than one reason.

Identify the following antioxidant molecule.                  A. alpha tocopherol hydroquinone                                                                                       B.dehydroascorbic acid           CH3          CH3                                                   C. alpha tocopherol semi-quinone             \             /                                                           D. ascorbic acid                C  =  C                                                            E. alpha tocopherol quinone          /             \                                                                     : O – C               C  –  O      CH3            \\          //            \   /               C  –  C               C – CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH2–CH2–CH2–CH–CH3             /             \            /                                   l                                l                                 l              CH3          CH2– CH2…

Is this a purine or a pyrimidine?

Answer the questions in the table below about this molecule:

0 0=P-0-CH₂ 0- H 1) How would you designate this acid in a abbreviation ? 09-0-962 6- H 3) Provide -NH₂ one-letter AR # # 2) 15 this a strand of DNA of RNA? How do you know? an Ntl₂ 0=P-O-CH₂ A K он н abbreviation for the Strand of DNA WITH complementary bases to the one shown above. Indicate the '5' and 3 ends

Can I have a check on 9 and help on 10

Please don't provide handwriting solution

7. Draw the protein: SRDR Second letter U A G UAU UAC. UAA Stop UGA Stop UAG Stop UGG Trp UUU Phe UCU UCC UGUT UGCJ U UUC U Ser UUA UCA UUG Leu UCG G CAUTHIS CUU CUC CCU СС CGU] CGC Arg CAC. Leu Pro CUA CUG CGA CAGJGn cGG) ССА CAA Gln CCG AUU AUC le ACU ACC AGU ser AGC. AAU Thr AACAsn AAG Lys GAUASP GAC. GAA GAG Glu AUA ACA AGA AUG Met ACG AGG Arg GCU GUU GUC GUA GUG GGU) GGC GCC Val Ala GCA Gly G GGA GCG GGG G First letter Third letter

The amino acid histidine has ionizable groups with pK₁ values of 1.8, 6.0, and 9.2, as shown. COOH H¸Ñ—CH CH₂ H 2 CH pH = COO™ H¸Ñ—CH 1.8 pk₁ CH₂ H lonizable -COOH = -COO- group CH COO™ H₂N-CH 6.0 pK₂2 CH₂ H -HisH -His N CH COO™ H₂N-CH 9.2 pk CH₂ H 2 —NH — —NH, CH A biochemist makes up 95 mL of a 0.13 M solution of histidine at a pH of 5.3. She then adds 60 mL of 0.10 M HCl. What is the pH of the resulting solution?