Concept explainers
(a)
To explain: The reason why normal individuals do not produce antibodies against DNA and phospholipids like individuals with the autoimmune disease systemic lupus erythematosus (SLE).
Concept introduction: Autoimmune diseases are a result of the immune system eliciting an immune response against self-antigens (any micro or macromolecule) produced by its own body tissues. Systemic lupus erythematosus is an autoimmune disorder where the immune system elicits an immune response against its own healthy tissues. In SLE, antibodies are produced against DNA and phospholipids. Antibodies are produced by the plasma cells that are also known as immunoglobulins, help to remove the invading pathogen.
(b)
To explain: The reason why the antigen‒antibody complexes accumulate in the tissues of individuals with SLE.
Concept introduction: Autoimmune diseases are a result of the immune system eliciting an immune response against self-antigens (any micro or macromolecule) produced by its own body tissues. Systemic lupus erythematosus is an autoimmune disorder where the immune system elicits an immune response against its own healthy tissues. In SLE, antibodies are produced against DNA and phospholipids. Antibodies are produced by the plasma cells that are also known as immunoglobulins, help to remove the invading pathogen. Antigens are any molecule that is foreign to the body.
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FUNDAMENTALS OF BIOCHEM.-NEXTGEN ACCESS
- Specific rotation is a measure of a solution's capacity to rotate circularly polarized light. The unfolding of the a helix of a polypeptide to a random conformation is accompanied by a large decrease in specific rotation. Polyglutamate, a polypeptide made up of only 1-Glu residues, has the a helix conformation at pH 3. When researchers raise the pH to 7, there is a large decrease in the specific rotation of the solution. Similarly, polylysine (1.-Lys residues) is an a helix at pH 10, but when researchers lower the pH to 7 the specific rotation also decreases, as shown in the graph. a Helix Specific rotation Poly(Glu) a Helix Random conformation Poly(Lys) Random conformation T + ° 2 4 6 В 10 12 14 PH Complete the statements about the molecular mechanism for these changes in specific rotation. Increasing the pH of a polyglutamate solution from 6 to 7 causes the carboxyl group of each glutamate residue Comed Artwer lose a proton. The negatively charged groups in each glutamate residue…arrow_forwardFrom the reaction data below, determine whether the reaction is first order or second order and calculate the rate constant. Time (s) 0 Reactant (mM) 6.2 1 3.1 2 2.1 3 1.6 4 1.3 5 1.1 Only a plot of 1/[reactant] versus t gives a straight line, so the reaction is 0.150 mM-1 s-1 . S second order . The slope, k, isarrow_forwardFrom the reaction data below, determine whether the reaction is first order or second order and calculate the rate constant. Time (s) 0 Reactant (mM) 5.4 1 4.6 2 3.9 3 3.2 4 2.7 5 2.3 Only a plot of In[reactant] versus t gives a straight line, so the reaction is s-1. . The negative of the slope, k, isarrow_forward
- A protein has a molecular mass of 400 kDa when measured by size-exclusion chromatography. When subjected to gel electrophoresis in the presence of sodium dodecyl sulfate (SDS), the protein gives three bands with molecular masses of 180, 160, and 60 kDa. When electrophoresis is carried out in the presence of SDS and dithiothreitol (DTT), three bands again form, this time with molecular masses of 160, 90, and 60 kDa. How many subunits does the protein have, and what is the molecular mass of each? four subunits: 180, 160, 90, and 60 kDa three subunits: 180, 160, and 60 kDa three subunits: 160, 90, and 60 kDa four subunits: 160, 90, 90, and 60 kDa Correct Answerarrow_forwardCalculate KM and Vmax from the following data: KM= i Vmax [S] (μM) vo (mM.s-¹) 0.1 0.34 0.2 0.53 0.4 0.74 0.8 0.91 1.6 1.04 μM mM s-1arrow_forwardPropose a detailed chemical mechanism for the enzyme catalyzed reaction below and briefly note similarities, if any, to enzymes that we've studied. CO2 + CO2 2 CO2 HO CH3arrow_forward
- 11. Which of the compounds below is the major product of the following reaction sequence? NOTE: PCC is pyridinium chlorochromate 1. BH 3 PCC 2. H2O2, NaOH NH HN ΗΝ, A B C CH3NH2, NaBH3CN D E NHarrow_forward10. Which of the compounds below is the major organic product obtained from the following reaction sequence? Ph Ph Ph A B OH 1. EtMgBr H2CrO4 Zn(Hg), aq. HCI PhCHO ? 2. H₂O, H+ Ph. C D Ph "ར HO OH Earrow_forward7. What is the major organic product obtained from the following reaction sequence? Ph A OH 99 Ph OH D Br HOCH2CH2OH H2SO4 1. Mg, Et₂O 2. PhCH2CHO HCI, H₂O Br OH Ph Ph OH B C Br OH Ph Earrow_forward
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