Chem+153B+-+Homework+3+solutions

Combine these amino acids into a tripeptide. Add or remove atoms and bonds as needed. Select Draw Rings More Erase / // III 0 H Atom Decorati || H H H H H C H 1 1 XXXF О-Н N H N C H H H CH₂ H₂C H CH₂ H₂C CH₂ 4 → 0

What is the sequence of bases in the strand of DNA that is complementary to the one shown below?   5'-T-T-C-A-C-T-G-A-C-3'   a.) 3'-U-U-C-A-C-U-G-A-C-5'       b.) 3'-T-T-C-A-C-T-G-A-C-5'       c.) 5'-A-A-G-T-G-A-C-T-G-3'       d.) 5'-T-T-C-A-C-T-G-A-C-3'       e.) 5'-G-T-C-A-G-T-G-A-A-3'

The image below is a positive ionization mode Electrospray ionization-mass spectrum (ESI-MS) spectrum for a peptide, obtained using high resolution mass spectrometry. If ionization occurs through de-protonation (assuming that the mass of a proton is 1.0 Da), what is the neutral mass of the peptide, in Da? 627.271 627.604 100 - 627.938 628.271 628.604 628.938 627.0 628.0 629.0 mass/charge (m/z) 628.271 626.271 1878.813 O 1884.813 % Abundance

Now consider alanine as a whole molecule. Use the Ką values from the chart above, and your understanding of the relationships among Ka, pH, and charge to select the predominant form of alanine that would exist at the pH indicated below. Note some choices may not be used and some may be used more than once. A. NH3+ D. NH3+ pH = 1 pH = 5 CH3 I C H pH = 7 pH = 11 CH3 + C I H COOH COO- B. NH₂ E. CH₂™ *-+000 COO- H NH₂ A D CH3 + C | H с COOH C. NH₂ F. NH₂ CH3 + - C H CH₂™ H COO- COOH

- - Biological Macromolecules Understanding the structure of nucleic acid strands For each molecule in the table below: Classify the molecule using the drop-down list. • Name the base at the 3' end of the molecule. • Write the standard base sequence abbreviation for the molecule. . ¹0-2-0 Explanation O=P-O-CH₂,0 O=P-O-CH₂, 0. 1- -0-2-0 O OH O=P-O-CH₂_0. 0 Check N. N N. N O=P-O-CH₂ 0. O NH₂ NH₂ N OH OH 0= N. NH N O O=P-O-CH₂,0. N. (1 N NH₂ 'N N N NH NH₂ Type of molecule: (Choose one) Name of base at 3' end: 0 Base sequence abbreviation: 0 Type of molecule: (Choose one) Name of base at 3' end: 0 Base sequence abbreviation: MacBook Pro C X © 2023 McGraw Hill LL

Given an amino acid sequence, you perform a FASTA search and find one match with an E value of le What does the low E value tell you about the the homology between the matched (target) sequence and the query sequence? The two sequences are not homologs. Both sequences are from the same organism. An E value of this size does not prove or disprove homology. The two sequences are homologs.

Protein sequence is always read (blank) terminal to (blank) terminal.  And DNA sequence is always read (blank) prime to ( blank) prime.  I need help filling in the blanks please? ? Thanks

Now consider alanine as a whole molecule. Use the Ką values from the chart above, and your understanding of the relationships among Ka, pH, and charge to select the predominant form of alanine that would exist at the pH indicated below. Note some choices may not be used and some may be used more than once. A. NH3+ D. NH3+ pH = 1 pH = 5 pH = 7 pH = 11 CH3 H CH3 1 H COOH COO- B. NH₂ E. NH₂ A D D с CH3 + C H - CH₂™ C | H COOH COO- C. NH₂ F. NH₂ CH3 + -C H - CH₂™ C I H COO- COOH

Modify isoleucine to show its structure at pH 1 and pH 13. Modify each amino acid by adding or removing atoms or bonds and by adding charges where appropriate. pH 1 pH 13 Select Draw Rings More Erase Rings More Erase C с CH₂ CH₂ H₂C H₂N 1 CH₂ | CH | 310 H― H O H N U с || 0 H Q2 Q Select Draw / ||| ||| H₂C H₂N 1 CH₂ | CH - n O H | H 0 H N H Q2Q

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…

The following diagram represents a(n): Top view 8 Side view Ο Ομισο 1000 CO O CO 100 OP CO POR an a-helix. an antiparallel a-helix. a parallel a-helix. an antiparallel b-pleated sheet. a parallel b-pleated sheet. 1080 O 22 Q O=O

a) Find the pH of 0.1 M of the different form of histidine species. (See image attached)  b) What is the principal species at pH , pH 5, pH 8, and pH 11?

The isoelectric point of a polypeptide or protein is equal to the pH at which the overall charge is equal to zero (0). 1 i Find the pH range to within 1 pH unit over which the polypeptide below will have an overall charge of 0. (In class on Friday, I worked out the changes in charge that the N-terminal -NH3+ and the C-terminal -COOH groups undergo over a limited pH range. Follow through to apply the same approach to all of the ionizing or dissociating groups, including the N-terminal and C-terminal groups, to estimate their separate, individual contributions to the overall charge on the polypeptide as a function of pH. 6, identify the two residues that control the transition for the polypeptide to acquire an overall charge of 0.) Alanyl-cysteinyl-lysyl-glutamyl-asparaginyl-histidinyl-tyrosine Cys - Lys - Glu Ala - A C *H3N CH3 .SH H K H HO. E - Asn His - Tyr N H Y O=0 ■NH3* NH₂ ΤΗΝ NH H Тон JOH oka values 7.0 8.4 10.5 4.1 6.0 4.0 10.5 ΣZavg

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Modify the structures (if necessary) to show the predominant form of the amino acid tyrosine at each pH. Be sure to include the proper number of hydrogen atoms on heteroatoms and the correct formal charges on atoms. At pH 3.5 Select Draw Templates More 15 C H₂N - CH I CH₂ HC = || HN HC OH OH O CH CH ✔ Erase 2 Q At pH 13.0 Select Draw Templates More G ✔ ||| C H N H₂N HC HC CH | CH₂ OH OH O CH | CH Erase Q2 Q

O Macmillan Learning achieve.macmillanlearning.com × Chapter 11 HW - General, Organic, and Biological Chemistry for Health Resources 回 Hint Guanine is a component of several important molecules, including guanosine triphosphate (GTP), DNA, and RNA. NOV Draw guanine. G Select Draw c Templates Groups More C H N 0 21 M MacBook Pro 114 2Q ZA A② 00 zoom Erase

I am given an unknown sample of an amino acid. On testing it, I find that its R group is polar, and contains a benzene ring. is most likely to be: O a. Threonine O b. Phenylalanine O c. Tryptophan O d. Histidine e. Tyrosine Previous page Next page Quiz navigation Time left 1:25:12 7.79 FM 14 572/2022 今 DELL F7 F8 F9 F10 F11 F12 PrtScr Insert Delete PgUp PgDn Home End Esc F1 F2 F3 F4 F5 F6 "R @ $ & Num Lock Backspace 1 4 6. WERL Tab Y Enter H. J K Caps Lock JL L BR Shift 1 Shift V Alt Ctrl Ctrl Fn Alt 目 Σ

Combine these amino acids into a tripeptide. Add or remove atoms and bonds as needed. Select Draw Rings More Erase / | C NOHS C-O - H 0 - H O - H N - C - H H CH, H,C CH, он SH HC CH

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Are the following compounds correct? These may OR may not be correct. Please look them over and correct them if needed. Please list what was done incorrectly if applicable. b. Is the following nucleotide found in DNA? If not, please explain why. a. Is the following tRNA correct? NH2 VALINE <5' N. 3'- 0=P-0-CH2 ОН ОН GUA a. b. DNAA=T G=C

7. Consider the DNA segment 5'-ATGACGGTTTACTAAGCC-3' a. Write the mRNA sequence that would be obtained from the segment's transcription.