Compare and contrast the ectomycorrhizae and the endomycorrhizae
What will be an ideal response?
Answer: Ectomycorrhizae do not deeply embed themselves into plant roots; instead, they appear to form sheaths around the roots. Endomycorrhizae do penetrate extensively into plant roots.
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You are a doctor examining a patient's blood test reports. You are looking at the ratio of helper T cells and cytotoxic T cells. Helper T cells ___________; cytotoxic T cells __________. You can tell them apart by the type of protein they ____________
A. activate other immune system cells; kill altered host cells; secrete B. activate other immune system cells; kill altered host cells; express on their plasma membrane C. kill altered host cells; activate other immune system cells; secrete D. kill altered host cells; activate other immune system cells; express on their plasma membrane E. activate antigens; destroy antigens; digest
Which of the following media will permit the growth of one group of bacteria while inhibiting the growth of some other groups?
A. Differential B. Characteristic C. Enrichment D. Selective
Which of the following is incorrect about biofilms?
A. They can protect the bacteria from disinfectants and drugs. B. They are an association of bacterial cells that form on a substrate. C. They can form on contact lenses. D. They are found on teeth. E. They are not associated with disease.
To prepare for a hiking trip in the Appalachian mountains you buy several field guides for the region from a used bookstore. You notice that the older guides list a single species of tiger swallowtail butterfly Papilio glaucus and an Appalachian morph of this species. However the newest guide list two separate species P. glaucus and P. appalachiensis. The authors of this guide state that the biological species concept was used in determining their classifications. What do you think led them to list two separate species of tiger swallowtail?
A. The discovery that P. glaucus and P. appalachiensis have distinct differences in wing coloration. B. The discovery that P. glaucus and P. appalachiensis interbreed in the wild. C. The discovery that P. glaucus and P. appalachiensis feed on different host plants. D. The discovery that P. glaucus and P. appalachiensis do not interbreed in the wild. E. The discovery that P. glaucus and P. appalachiensis have a genomic similarity of 99%.