Which one of the following statements concerning plasmids is true?
A. All plasmids can be transferred between bacteria by conjugation
B. Much of the information coded in the plasmid is essential to the survival of the bacteria cell
C. Resistance plasmids carry genes for antibiotic resistance
D. Resistance plasmids cannot be transferred to other bacterial cells
E. Plasmids lack an origin of replication
Ans: C. Resistance plasmids carry genes for antibiotic resistance
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Which of the following can be found in an animal cell, but not a plant cell?
a. centrosomes b. mitochondria c. DNA d. ribosomes
A ____________ metabolizes the organic matter of dead organisms.
A) parasite B) saprobe C) photoautotroph D) all of the above
Pasteurization was first developed to kill __________ in wine.
a. spoilage bacteria b. all bacteria c. disease-causing bacteria d. antibiotic-producing bacteria e. probiotic bacteria
Why is PCR useful?
A) It allows fragments of DNA to be separated by size. B) It is essential for making many copies of a transgenic animal. C) It allows for making many copies of DNA when the starting sample is small. D) It is required for the introduction of DNA into reproductively cloned animals.