Transgenic farm animals have not gained importance as sources of pharmaceuticals because
A) they are too difficult to maintain.
B) they are more susceptible to cancer and other diseases.
C) they produce diluted forms of pharmaceuticals.
D) they carry multiple viral strains.
A) they are too difficult to maintain.
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Which of the following materials can serve as food sources for fungi? Select all correct choices
A. elephant dung in the Serengeti B. leaf matter in a New England forest C. a bear carcass in Siberia D. a fallen redwood tree in California E. the fruit in your refrigerator
For the bay checkerspot butterfly, a poor flyer, to recolonize small patch habitats, the new habitats must be ____
a. high quality b. low quality c. close to a source population d. far from a source population e. above a certain number of individuals
Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells. b. Viruses can only find the necessary components to keep itself alive in one type of cell. c. Viruses can only infect cells that have the appropriate receptors for them to attach to. d. Viruses cannot move throughout the body so only infect the cells they first come into contact with.
When plants have a distinct haploid stage and diploid stage, this is referred to as:
a. asexual and sexual generations. b. binary generations. c. mitotic and meiotic generations. d. alternation of generations. e. parthenocarpy.