Biology Questions

Anonymous
timer Asked: Nov 19th, 2016

Question description

See attached 10 questions.

Which of the following regulatory mechanisms is described incorrectly? A feedback inhibition: product inhibits its own production B substrate availability: more substrate increases enzyme activity (until it reaches saturation) C competitive inhibitor: binds to the active site of the enzyme D All are correct E enzyme modification: enzyme gains or loses a functional group Question 2 Select one answer. 10 points Energy is stored in different forms in the body. ATP is very unstable and is put to use very quickly in cells. Other storage molecules last longer. Which gives the major energy stores of the body in the correct order? A Short term: fat. Medium term: glycogen. Long term: glucose. B Short term: glucose. Medium term: glycogen. Long term: fat. C Short term: glycogen. Medium term: glucose. Long term: fat. Question 3 Select all that apply. 10 points Which of the following are characteristics of metabolic pathways? A Contain many intermediates. B Are regulated. C Each pathway has a key enzyme that catalyzes most of the reactions D Are specific for each organism E Are often reversible Question 4 Select one answer. 10 points Which best describes body weight regulation in a normal human who is living in a modern society? A Our normal responses of appetite and metabolism tend to B cause weight gain in modern societies, and they also tend to make weight loss difficult. Our normal responses of appetite and metabolism ensure that adults remain at a given normal body weight. Any change from this normal weight sets in motion responses that return the body to its normal weight. Question 5 Select one answer. 10 points Which of the graphs in the figure best illustrates the activity of an enzyme as substrate concentration increases from 0 to the saturation point of the enzyme? A B C D E Question 6 Select one answer. 10 points The fundamental difference between competitive and noncompetitive inhibition is: _________________________ A B C the manner of binding of the substrate to the enzyme. the manner of binding of the inhibitor to the enzyme. the size of the active site of the enzyme. Question 7 Select one answer. 10 points In a metabolic pathway, a typical control mechanism is to have: ________ A the final product inhibit an early step. B the final product inhibit the enzyme responsible for its own production. C a lack of reactant stimulate the pathway. D a reactant inhibit a late step. Question 8 Select one answer. 10 points What would be a typical regulatory system in a metabolic pathway? A The pathway’s product slows it down, so that the product is maintained at a constant level in the cell or organism. B The pathway’s product makes it go faster, so that more and more of the product builds up in the cell or body. Question 9 Select one answer. 10 points What is the connection between a person’s genes and his or her metabolism? A DNA regulates metabolic pathways directly B structural proteins encoded by genes regulate metabolic pathways C enzymes encoded by genes regulate metabolic pathways Question 10 Select one answer. 10 points Cells or organisms tend to maintain steady internal conditions. What is the name for this property and ability of life? A Adaptation B Metabolism C Homeostasis Reproduction

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