What is the composition of the genome of prokaryotes?
a. a single linear DNA molecule
b. a single circular DNA molecule
c. many linear DNA molecules
d. a single DNA molecule that may be circular or linear
Ans: d. a single DNA molecule that may be circular or linear
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Transferring Euglena into a dark environment results in the loss of photosynthetic pigment. What conclusion does this support?
A. Euglenoids are neither plant-like or animal-like protists. B. Euglenoids are closely related to plants. C. Euglenoids are obligate photoautotrophs. D. Light triggers heterotrophy.
Recognition proteins are most important for
A) distinguishing foreign cells from "self" cells. B) active transport of molecules. C) maintaining membrane fluidity. D) maintaining membrane integrity. E) facilitated diffusion of molecules.
A basic difference between a prokaryotic cell and a eukaryotic cell is that the prokaryotic cell
A) is structurally more complex. B) lacks DNA. C) lacks a nucleus. D) is considerably larger. E) possesses membrane-bound organelles.
________ organisms are valuable in the production of vaccines
a. Infectious b. Pathogenic c. Virulent d. Attenuated