To what group do I belong? I am neither prokaryotic nor photosynthetic, and I obtain nutrients by
secreting digestive enzymes into my environment.
a. Bacteria
b. protists
c. Fungi
d. Plantae
e. Animalia
C
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Cyclic 2,3-diphosphoglycerate (cDPG) is present in molar quantities in the cytoplasm of many hyperthermophilic methanogens. The function of this compound is to
A) prevent rRNA misfolding. B) prevent chemical damage to DNA at high temperatures. C) counteract the effects of high osmotic environments. D) activate hydrogen gas.
When an enzyme becomes denatured, it
a. increases in effectiveness. b. loses its requirement for a substrate. c. forms an enzyme–substrate complex. d. loses its ability to function.
The effects of most antimicrobial drugs are greater if the microorganisms are actively growing.
Answer the following statement true (T) or false (F)
According to the fluid mosaic model of cell membranes, phospholipids _____
A) can move laterally along the plane of the membrane B) frequently flip-flop from one side of the membrane to the other C) occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane D) have hydrophilic tails in the interior of the membrane