Biology, 16.03.2020 18:53 haydencheramie
The intracellular calcium ion concentration of ventricular muscle cells averages 10-4 mmol/L during diastole. The calcium ion concentration in transverse tubules (T tubules) averages 2.5 mmol/L at rest. A protein transporter on the membrane of the T tubule exchanges sodium for calcium. The transporter uses the transmembrane sodium gradient to fuel the exchange. Which of the following transport mechanisms best describes this type of transporter?A. facilitated diffusionB. primary acti*e transportC. secondary acti*e cotransportD. secondary acti*e countertransportE. simple diffusion
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Biology, 21.06.2019 17:20
The trp operon in e.coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.
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The intracellular calcium ion concentration of ventricular muscle cells averages 10-4 mmol/L during...
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