Four small bags are filled with a 10% starch solution. The membrane of each bag contains microscopic pores large enough to let smaller water molecules cross but too small for the larger starch molecules to cross
Each bag is placed in a separate beaker as follows: Bag 1 is placed in distilled water containing no starch (0% starch). Bag 2 is placed in a solution of distilled water and 5% starch. Bag 3 is placed in a solution of distilled water and 10% starch. Bag 4 is placed in a solution of distilled water and 50% starch. The bags are weighed initially and at regular intervals for a specific period of time. Some bags saw a change in weight, and some did not. Answer the following questions based on the expected outcomes of this experiment. a. Which bag should weigh approximately the same at the end of the experiment as it did at the beginning of the experiment? b. Which bag is expected to be the heaviest at the end of the experiment?
a. Bag 3; b. Bag 1
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Which of the following would you predict for an allosteric enzyme? Choose all that apply
A. An increase in the concentration of substrate molecules could activate the enzyme. B. Non-competitive inhibitors would bind at the active site. C. A downstream product later in the pathway could inactivate the enzyme. D. A downstream enzyme later in the pathway could inhibit the allosteric enzyme. E. An allosteric inhibitor could cause a conformational change in the enzyme decreasing its activity.
Sludge
A. is a byproduct of sewage treatment. B. may be a source of pollution. C. takes up space in a landfill. D. All of the choices are correct.
Which of the following is a small Gram-negative rod requiring X-factor for growth?
A. Escherichia coli. B. Treponema pallidum. C. Neisseria gonorrheae. D. Haemophilus ducreyi
The first organisms
a. absorbed their food supplies from the organic molecules that surrounded them. b. were eukaryotes. c. utilized fermentation for energy production. d. utilized ATP. e. did all of these except they were NOT eukaryotes.