Allosteric enzyme regulation is usually associated with _____
A) feedback inhibition
B) activating activity
C) an enzyme with more than one subunit
D) the need for cofactors
C
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Through evolution, the hindlimbs of cetaceans have been modified, eventually becoming
a. flippers. b. tail. c. non-existent. d. flukes. e. enlarged.
Extinction occurs when all individuals of a population die out
Indicate whether the statement is true or false
A student made a culture of yeast cells in a test tube by mixing a pinch of dry yeast with 10 milliliters (mL) of distilled water. This test tube was labeled A. The student then took 1 mL of the resulting solution and placed it in test tube B and with 9 mL of distilled water. The student continued using this method of serial dilution through trial E as shown in the figure above. Examining the solution in test tube E under a microscope, the student found that there were 1,500 yeast cells per milliliter. Which of the following is the concentration of yeast cells per milliliter in test tube c.
a) 15 b) 150 c) 15,000 d) 150,000
Which of the following is a lactic acid bacterium used in the production of food?
A) Aspergillus oryzae B) Gluconobacter C) Leuconostoc D) Penicillium E) Saccharomyces cerevisiae