Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids
What is this difference? A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly.
B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants.
C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear.
D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome.
D
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A. phenotype. B. genotype. C. metabolism. D. nucleoid.
HeLa cells are
a. normal cells. b. stem cells. c. cancer cells. d. viral-infected cells. e. bacterial cells
Which of the following are examples of exotoxins?
a. streptolysin b. coagulase c. collagenase d. keratinase e. kinase f. LPS g. hemolysis
Which class of animals has the largest number of species?
A. Arachnida B. Insecta C. Gastropoda D. Bivalvia E. Arthropoda