Answer c and d thank you (c) ADP binds to platelets to initiate the activation process. Two binding receptors wereidentified on platelets, one with a Kp of 0.35 µM (receptor A) and one with a KD pf 7.9 µM(receptor B). Which receptor is a low-affinity binding site and which site is a high-affinitybinding site?(d) The ADP concentration required to activate a platelet is in the range of 0.1-0.5 µM. Whichreceptor will be more effective at activating the platelet? Explain your answer.

Dissociation constant Kd is used to describe the affinity of a receptor to its ligand . It is a…

Answered: (c) ADP binds to platelets to initiate…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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The F ab fragment of an antibody molecule has essentially the same affinity for a monovalent hapten as does intact IgG. (a) What is the smallest unit of an antibody that can retain the specificity and binding affinity of the whole protein? (b) Design a compact single-chain protein that is likely to specifically bind antigen with high affinity.
Antibodies are effective against bacteria as well as viruses, but some bacteria produce an enzyme that cuts immunoglobulin G molecules right at the “bend” to separate each antigen-binding “arm” from the “stem.” (a) What type of bond is broken by the bacterial enzyme and what type of reaction does this enzyme catalyze? (b) Would the action of the bacterial enzyme affect the ability of immunoglobulins to cross-link bacterial cells?.
a) Calculate the weight (in gram/ml) of tumour cells in each vial. Show your workings. b) Calculate the glucose concentration in each vial (in mol/ml). Show your workings. c) Based on Table 1, calculate the glucose concentration / 1 gram tumour cells in conditions A, B and C. Show your workings.
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Certain antibodies have been shown to bind only to the folded structure oftheir target protein ligand; yet others will bind to both the folded and denatured states of the same protein ligand. Explain this observation.
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7. A) What effect does the compound GppNHp, when applied to the inside of a cell during whole cell patch clamp recording, have on Cav2 channels at presynaptic terminals? B) What is the mechanism by which this compound affects G-protein signaling and Ca√2 channel activity? B. A.
Poliovirus is highly cytopathic both in cultured cells and in animals. Inoculation of mice with poliovirus leads to a robust antibody and cellular response. Explain why mice infected with a poliovirus mutant that cannot cause cell death have poor antibody and cellular responses. What would be one strategy to restore robust antibody and cellular responses in mice infected with this mutant virus?
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In 1925, E. Gorter and F. Grendel used an apparatus like that described in Problem 1 to determine the surface area of a lipid monolayer formed bylipids extracted from erythrocytes of several animal species. They used a microscope to measure the dimensions of individual cells, from which they calculated the average surface area of one erythrocyte. They obtained the data shown in the table below. Were these investigators justified in concluding that “chromocytes [erythrocytes] are covered by a layer of fatty substances that is two molecules thick” (i.e., a lipid bilayer)?
Regarding the production of recombinant monoclonal antibodies, it is CORRECT to state that: * (JUST ONE STATEMENT IS CORRECT) (A) Chimeric and humanized antibodies differ in relation to the percentage of sequence of the constant chain of molecules from the human genome (B) Chimeric antibodies are industrially produced by joining purified protein fragments of the Fab fraction of murine antibodies and the constant portion of human antibodies. (C) When using cells dependent on the DHF amplification system, we must use a vector containing the coding information of the light and heavy chains and another vector that contains the coding sequence of the enzyme dihydrofolate reductase (D)The industrial purification of monoclonal antibodies should preferably use an initial step based on the use of affinity columns, which will bind the antibodies by the Fc fraction (E) The use of amplification systems such as GS and DHFR has as main objective to make the production of monoclonal antibodies…

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