Energies Associated With Movement of Ca2+ Across Sarcoplasmic Reticulum using Membrane Potentials and Calculations involving Calsequestrin

Problem: (a) In skeletal muscle the Ca+2 concentration is controlled by the SR (sarcoplasmic reticulum). At rest, the Ca+2 pump of the SR can maintain a concentration gradient of 0.5 mM inside SR / 0.1 µM cytoplasm (aka, outside the SR). How much energy is stored in this gradient; ignore the effects of charge. (b) The pu ...continues

Membrane Potential Measurements of Axon of Giant Squid

During an experiment a neuropsychologist measures the membrane potential of a squid giant axon in the presence of a bathing solution of known composition. He then removes the cytoplasm and replaces it with a synthetic solution. At the same time he alters the external medium from that used before and again measures the membrane ...continues

GTP/GDP

Guanyl nucleotide regulatory proteins (N) alter cell function based on the type of guanyl nucleotide occupying the nucleotide site on the protein. The affinity of this site for guanyl nucleotides is to a certain extent under hormonal control. Given a Ka of the site for guanyl nucleotides of 3 x 10^7 M in the presence of hormon ...continues

bIn the urea cycle, the molecule that is synthesized in the cytosol and transported to the mitochondrial matrix for subsequent reactions is

Can you please look at the following questions. Thanks.

True or False: tRNA, mRNA, and rRNA are all required for protein synthesis.

Please review these questions. I have already provided an answer. If I am incorrect, please correct me. Thanks. 1. a 2.b 3. a 4.a

Which of the following, ATP or GTP, is required for ATP synthesis?

Can you please look at the following questions. Thanks.

Using Beer's Law to Calculate Glucose Concentrations

I have a series of protein free patient blood samples at time; 0, 30, 60, 90, 120, 180 mins. I also have a standard sample. I have measured the absorbance of these samples; 0.655, 0.717, 0.689, 0.430, 0.852, 0.477 respectively. Standard sample 0.760 The glucose concentration in the standard test tube is 0.278 mmole/L. Using Beer ...continues

Fatty acids, membrane proteins, steroids, lipid bilayers, prostaglandin synthase, arachidonic acid.

Which fatty acid -palmitic, stearic, palmitoleic, or arachidonic, would have lowest m.p. and explain why. Which would be chiral? A)glyceryl tripalmitate,B) glyceryl 1-stearate, 2,3 dipalmitate,C) glyceryl 2-stearate, 1,3-dipalmitate. Explain why. A lipid is isolated and treated with boiling aqueous NaOH. The products ob ...continues

Determining Km and Vmax

I have made a lineweaver-burk graph with some data, but I don't know how to determine Vmax and Km from it? Would you please give me an example of how to do it. Please make a lineweaver-graph with some values and tell me how to determine Km and Vmax. I can figure out the slope from the graph, but cannot figure out Y and x in Y ...continues

The three distinctive parts of the wheat kernel are the

The three distinctive parts of the wheat kernel are the a. germ, the endosperm and the bran b. bran, the flour and the endosperm c. flour, the bran and the germ d. floor, the bran and the starch