Which of the following is TRUE regarding plasmids?
A. Plasmids are small, usually a few thousand to ten thousand base pairs.
B. Plasmids are linear.
C. Plasmids are contained within the bacterial chromosome.
D. Plasmids are rarely found in prokaryotes.
E. Plasmids dominate in eukaryotes.
A. Plasmids are small, usually a few thousand to ten thousand base pairs.
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Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers. B. acids. C. water. D. salts. E. hydrogen.
As a result of being cloned, Dolly exhibited abnormalities not seen in normally reproduced sheep. One of these abnormalities was she
A. developed arthritis in her hind legs. B. was able to reproduce asexually, without requirement of a male sperm. C. developed lung disease at a young age of six years. D. developed arthritis in her back. E. gave birth to healthy lambs through normal sexual reproduction.
The large, ancient land mass that contained all the continents is known as ____
a. Laurasia b. Pangea c. Gondwana d. Atlantis e. Europa
Dogs and pigs are members of different species because
A. one is a predator, and the other is prey. B. hybrids between them are infertile. C. they are at the far end of the ring in a ring species. D. of prezygotic barriers to their ability to breed. E. of postzygotic barriers to their ability to breed.