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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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True/False Question (suggested time - up to 1 minute):
Core histones (H2A, H2B, H3, and H4) contain many positively charged amino acid residues, such as lysines, arginines, and histidines.
O True
O Fatse
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The activity provides you with a version of the NGF pathway, an example of a RTK. All of the proteins involved can be in ON/OFF states. Using this cell signaling pathway you will be asked a variety of questions to determine how the molecules are regulated, but also how a cell would respond if this cell signaling party steps were interrupted or activated. Neural Growth Factir (NGF) Ras- Ras- GDP GTP Trk-A Ras-GEF braf braf МЕК МЕК ERK ERK ERK ERK STAT STAT Spiouty DNA Nucleus Cytosol
DO NOT COPY OLDER ANSWERS! AND SHOW FULL WORK! I have a mixture of 4 proteins, whose sequences are shown below (note that each protein is a 100-repeat of the sequence shown). Protein A: (Gly-Ala-Lys-Val-Ile-Phe-Glu-Val-Asn-Gly) Protein B: (Ala-Ala-Lys-Arg-Ile-His-Glu-Ala-Asn-Lys) Protein C: (Glu-Val-His-Asp-Ala-Asp-Glu-Val-Asn-Asp) Protein D: (Ala-Lys-Arg-Phe-Trp-Phe-Gly-Ile-Ala-Gly) 1) Which protein/s are MOST LIKELY to precipitate out at a pH of 3.5? a) A b) B c) C d) D e) B & C f) A & D g) None of them h) Cannot be determined.
You are investigating a lysosomal storage disease and you discover that newly synthesized lysosome hydrolases (proteins that should be sent to the lysosome) are secreted from the cells rather than being delivered to the lysosomes (where they should normally be located). What is the most likely explanation for this finding? (Hint: what might be different about the proteins that would cause them to not end up in the correct location?)
True or False. 1. a.) RNA polymerase decodes mRNA so the ribosome can make proteins. b.) Only coding RNA can interact with the ribosome. c.) The ribosome is composed of both protein and ncRNA. d.)The ncRNA components of the ribosome behave as a ribozyme. Pick one of the FALSE statements from the 4 previous questions and explain why it is incorrect.
The hemoglobin in the fetus (HbF) is a structural variant of the hemoglobin in the mother (HbA). HbA is a tetrameric protein complex consisting of two α-globin and two β-globin subunits. HbF is made up of two αglobin and two γ-globin subunits, where the γ-globins are similar to the β-globins but γglobins have lower affinity for 2,3- bisphosphoglycerate or BPG. Studies of oxygen transport in pregnant mammals show that the oxygen-saturation curves between the red blood cells of the fetus and the mother are markedly different. 1. The shape of hemoglobin binding curves is: hyperbolic or sigmoidal 2. a) Based on the binding curves, determine the dissociation constant (Kd) for each hemoglobin complex. (Show correct units.) Kd of HbF + BPG: ________________ Kd of HbA + BPG: _____________________ b) Which has a higher affinity for oxygen? HbF+BPG HbA+BPG 3. a) How many BPG molecule(s) is/are expected to bind one hemoglobin complex? 1 2 3 4 b) BPG binding preferentially stabilizes which state…
Please fill in the following blanks with the options that correctly finishes the sentence. a. At a low O₂ pressure the [Select] hemoglobin is in a [Select] [Select] [Select] 9 [Select] " bond with [Select] heme, and the protein's central channel is [Select] b. The proximal histidine forms a(n) [Select] state is stabilized. In this conformation state, the heme prosthetic groups is each subunit's heme is more likely to be the proximal histidine is [Select ] bond with while the distal histidine forms a(n) [Select] to the
1st answer choices: yes, no 2: yes, no 3:increase, decrease 4: a lot of mRNA or very little mRNA 5: less mRNA, more mRNA, or the same amount of mRNA
During elongation eEF1α complexed to GTP escorts the aminoacyl tRNA to the ribosome. True False
Draw the peptide at a pH @1 of Cys-His-Glu-Met-Ile-Ser-Thr-Arg-Tyr
Subject: chemistry
AAAGAGAAAAGAAUA to AAAGAGAAAUGAAUA. Suppose the codon sequence has a single base pair mutation If the old protein sequence was Lys-Glu-Lys-Arg-Ile, what will be the new sequence encoded by the mutant gene? (Use the 3-letter amino acid abbreviations with hyphens and no spaces in between, i.e. Ser-Asn-Tyr-Leu-Pro.) Submit Answer Retry Entire Group No more group attempts remain
izzing/user/attempt/quiz_start_frame_auto.d21?ou=D3269550&isprv3&drc%3D1&qi=1995726&cfql=0&dnb3D0&fror 12 Time Left:0:04:09 Angelina Tran: Attempt 1 O anabolism Question 50 (2 points) Listen Which of the following is NOT part of the endomembrane system? O chloroplast plasma membrane vesicles endoplasmic reticulum Previous Page Next Page Page 10 of 10 Submit Quiz 45 of 50 questions saved MacBook PrO

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