A microoganism has been described to you as living in hot acidic habitats in the waste piles of coal mines that regularly sustain a pH of 1 and a temperature of nearly 60°C. Which type of organism do you immediately assume it is?
A. Firmicutes
B. Spirochaetes
C. Archaea
D. Actinobacteria
E. Gracillucates
Answer: C
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All atoms possess the ability to do work. The term that is defined as the ability to do work is:
A. matter B. energy C. molecules D. space
The first stable intermediate produced in the Krebs cycle is
a. pyruvate b. acetyl CoA c. fructose bisphosphate d. oxaloacetate e. citrate
A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. covalent bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the nonpolar end of the phospholipid molecule. E. hydrogen bonds with the polar end of the phospholipid molecule.
"Before you just dump that enzyme-active presoak into the washing machine, be sure to ____________ so it will do a better job."
A. rub it into the stained area to increase enzyme-substrate contact B. turn up the water temperature to boiling to get the enzyme molecules moving faster C. add chlorine bleach to the enzyme D. dilute the enzyme with water