What are the two main types of mycorrhizae, and how do they differ? List three ways in
which mycorrhizal associations are beneficial to plants. What will be an ideal response?
Endomycorrhizae extend through the cell walls of root cells but do not penetrate the
cytoplasm. Ectomycorrhizae coat the plant root but not the root cells.
Mycorrhiae are beneficial to plants because they:1.
decompose organic material in the soil and increase the surface area of a plant’s roots so
that the plant can absorb more water and nutrients
2. connect plants, allowing nutrients to flow between them
3. release chemicals that protect the plant against herbivores and pathogens
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A mutation in one gene that compensates for a mutation in another gene to result in the wild-type phenotype is called an intergenic suppressor mutation
Indicate whether the statement is true or false
Lions, leopards and other large terrestrial predators generally maintain well-defined territories. What kind of dispersion pattern would you expect this to produce?
A. clumped B. clustered C. uniform D. random E. logistic
What are the four major types of biological molecules?
What will be an ideal response?
Occasionally, an episode of food poisoning occurs which centers around processed ham, sausage, or salted pork. These episodes are almost always assumed to be due to ingestion of Staphylococcus aureus unless other evidence proves differently. This is because
A) People whose diet include high-fat foods such as these are more susceptible to infection with Staphylococcus aureus. B) Staphylococcus aureus is one of the few bacteria able to multiply in foods as salty as sausage, ham, or salted pork. C) Staphylococcus aureus is responsible for most episodes of food poisoning. D) Staphylococcus aureus is able to take advantage of the high-fat content found in these foods better than other bacterial species.