Conjugation is a process in which:
a. a virus, containing pieces of bacterial DNA that it inadvertently picked up from its previous host, infects a bacterial cell.
b. a bacterial cell bursts open, releasing short lengths of DNA, which are taken up by another bacterial cell and inserted into its own genome.
c. exact copies of a bacterial cell's DNA are transferred into daughter cells.
d. a bacterium transfers a copy of some or all of its DNA to another bacterium.
Ans: d. a bacterium transfers a copy of some or all of its DNA to another bacterium.
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A researcher collected a single-celled organism from birdbath water and grew the organism in a laboratory. The researcher observed the organism reproducing by cell division, which resulted in identical offspring generations. This organism exhibits a form of
A. sexual reproduction, mixing genetic material from the parent cells. B. asexual reproduction. C. a form of reproduction occurring only in bacteria. D. sexual reproduction of fungi. E. evolution of each new generation produced.
In the spiral staircase model of DNA, the rungs are
a. deoxyribose sugars. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate groups. e. composed of all of these.
Which of the following examples does NOT describe a predation event?
a. a pollinator eats the pollen and nectar of a flower b. a carnivore catches and eats a deer c. an herbivore eats a few of the leaves from a tree d. a producer creates energy from sunlight e. only b describes a predation event
All of the following describes preformed toxins EXCEPT:
A. it associated with Staphylococcus aureus, Bacillus cereus and botulism caused by Clostridium botulinum B. the symptoms caused by preformed toxin occur much sooner than for other forms of poisoning C. the bacteria do not need to grow for the symptoms to occur D. the poisoning may be treated successfully by giving a high dose of broad spectrum antibiotics