Molecular biologists rely on many, often sophisticated, techniques to pursue their discipline. Ultracentrifugation, electron microscopy, X-ray diffraction, electrophoresis, and computer interfacing are fundamental tools
Model organisms provide the raw materials for study. List three organisms (or organismic groups) often used by recombinant DNA technologists and describe a major advantage of each group.
Bacteriophage: useful vector, relatively simple genome, short generation time. Bacteria: relatively simple, short generation time, simple growth requirements, well understood genetics, transformable. Viruses: capable of carrying recombinant DNA and infecting eukaryotic cells. Yeast: relatively simple for a eukaryote, short generation time, simple growth requirements, transformable.
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Due to its unusual habitat (inside the digestive tracts of other animals), the tapeworm lacks _____
A) a reproductive system B) a mouth C) a digestive tract D) a mouth and a digestive tract E) a reproductive and digestive system
The skin infection streptothrichosis is caused by members of the genus ________.
A. Streptomyces B. Streptococcus C. Dermatophilus D. Propionibacterium
Smooth muscles
a. are not striated. b. have spindle-shaped cells. c. are found in the walls of hollow structures such as blood vessels and the stomach. d. are involuntary. e. include all of these descriptions.
According to the International Union for Conservation of Nature (IUCN), which of the following sequences shows groups with the highest percentage of species in danger of extinction, from most endangered (on the left) to least endangered (on the right
)? A) plants ? amphibians ? birds B) amphibians ? birds ? plants C) birds ? plants ? amphibians D) plants ? birds ? amphibians