parvathalajayachandra

An enzyme facilitates chemical reactions by:

Select one:

a. Increasing the free-energy difference between reactants and products.

b. Decreasing the free-energy difference between reactants and products.

c. Lowering the activation energy of the reaction.

d. Raising the activation energy of the reaction.

e. None of the above.

Q2.

Enzymes are important components of biological systems because they:

Select one:

a. Speed up reactions.

b. Reduce the activation energy of reactions allowing them to occur.

c. Catalyze specific reactions, allowing for the regulation of metabolism.

d. b and c.

e. a, b, and c.

Calculate the solubility of calcium oxalate in a 0.15 M solution of sodium oxalate (Ksp calcium oxalate is 2.3×10-9

Discoveries in DNA, cell biology, evolution, and biotechnology have been among the major achievements in biology over the past 200 years with accelerated discoveries and insights over the last 50 years. Consider the progress we have made in these areas of human knowledge. Present at least three of the discoveries you find to be most important and describe their significance to society, health, and the culture of modern life.

For each of the energy systems you listed above, list which macronutrient(s) is being utilized. First punch within 3 seconds of starting the round

Carefully read the following sentences, as they apply to the bioenergetics occurring in an athlete’s leg muscles during the first 3 minutes of the race. Highlight the word or words in the sentences that are incorrect. Write the correct word or words in the space under each sentence. Clearly indicate which word or words are being replaced with your suggestions. Carrie is standing at the starting line awaiting the starter’s gun to begin the Indianapolis Half Marathon. In the initial 5 seconds, as she begins to accelerate to race pace, the four energy systems begin to respond to the increased need for energy. The immediate ATP needs are met initially by the muscle’s existing stores of ATP and lactic acid, which constitute what is known as the muscle cell’s anaerobic energy system. Almost as quickly, the phosphagen energy system begins metabolizing fats for energy, and starts to contribute toward the increased need for ATP. About 2 minutes into the race, the aerobic energy system has had time to ramp up its production of creatine phosphate and begins to produce all of the energy Carrie’s muscles need. Fats and proteins are the primary macronutrients metabolized by the aerobic energy system during the race. The other three energy systems back off and play only a minor role in supporting the needed ATP from then on.