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1. If E. coli cells are grown in medium in which lactose is the only available carbon source, which of the following events will occur with respect to the lac operon?A. RNA polymerase will be blocked from binding to the promoter.B. The lac repressor will bind to the operator sequence.C. Three distinct mRNAs will be synthesized, encoding the structural genes (lacZ, lacY, lacA).D. Cyclic AMP (cAMP) concentrations will be low.E. The catabolite activator protein (CAP) will stimulate transcription.2. A mutation occurs in the lac repressor protein such that it can no longer bind to allolactose. What effect will this mutation have on expression of proteins of the lac operon in the presence of lactose?A. It will have no effect since lactose shuts off the operon.B. It will decrease expression of the lac operon proteins.C. It will increase the expression of lac operon proteins.D. It will increase the expression of lac operon proteins, but only when lactose is present.E. It will have no effect since the operon is modulated by the CAP protein
Assume you remove your test cultures from the incubator and notice that one of them- a know fermenter- has a gas bubble in the Durham tube.
Suppose a population evolving by genetic drift in which the frequency of allele K is 0.65. What is the probability that at some point in the future allele K will drift to a frequency of 1?
why do they do this? Must provide sources.
Calculation of amount of phenol red in micrograms present in 3ml of the solution, you will require to use the following data: the concentration of the unknown 5.0 micromoles, volume = 3ml, MW of phenol red = 376.4g.
Determine when glucagon binds its receptor there is an increase in the second messenger, cAMP. cAMP levels can be reduce by which of the following enzymes?
Import or export of solutes (chemiosmotic work) turning the flagellar motor (mechanical work) Synthesizing ATP via the F0F1 ATPase (chemical work; discussed next lecture) how is this energy generated or replenished.
Using principles of community ecology, propose a hypothesis to explain the results and outline her methods and science processes (as in dependent variable, independent variable, controls, constants) as used in the experiment. What extra evidence woul..
Your doctor prescribes a drug that should be taken orally. You don't like swallowing big pills, so in the place you crush the pill into a fine powder, dissolve it in saline, and inject it into a vein in your arm. Why is this really bad idea.
If relatively small carbonaceous chondrites from space were a significant source of Earth's original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth.
he clinical laboratory returns the following arterial blood values for patient: pH = 7.2; plasma HCO3- = 29 mmol/L; plasma pCO2 = 75 mmHg. Determine the patient's acid-base disorder?
Suppose that the Temperature is 37C and the Membrane Potential is -60mV, with the interior negative with respect to the exterior of the cell.
The digastric and omohyoid muscles are similar in that they both have________. Suprahyoid, Two bellies, 60
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