Sexual reproduction first evolved among the
A. amphibians.
B. land-dwelling vertebrates.
C. insects.
D. marine organisms.
Answer: D
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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. E) Bacterial plasmids typically do not modify the growth of the host cells; Ti plasmids modified for genetic engineering always produce plant galls.
The protein dystrophin is produced ____________________
a. at the ribosomes in the cytoplasm b. in the nucleus of the cell c. in the Golgi complex of the cell d. in lysosomes
Tetrahymena is a
A) fungus. B) protozoa. C) green alga. D) weed. E) bacteria.
According to the central dogma, which of the following represents the flow of genetic information in cells?
A) protein to DNA to RNA B) DNA to RNA to protein C) RNA to DNA to protein D) DNA to protein to RNA