1. Describe your local soil structure: is it a mollisol? Ultimisol? Be specific about its characteristics. 2. Discuss the role of macroinvertebrates in soil formation and cycling, specifically in temperate hardwood forests. 3. While some animals (like snakes) get through the cold months by ” hibernating” , why do some […]

A scientist clones a regulatory gene that is involved in controlling the expression of other genes, and discovers that the regulatory gene encodes a histone deacetylase enzyme. It is likely that this enzyme regulates gene expression by: A.Causing tighter packing of the chromatin at the target gene, thereby inhibiting transcription […]

QUESTION 1: An Hfr strain is used to map three genes in an interrupted matingexperiment. The cross is Hfr/a+ b+ c+ rif X F-/a- b- c- rifr. (Nomap order is implied in the listing of the alleles; rifr isresistance to the antibiotic rifampicin.) The a+ gene is requiredfor the biosynthesis […]

Select a toxicant that can be classified as an air,water or soil pollutant or an organic solvent .Discuss the exposure limits of this toxicant ,how an individual may be exposed and toxic effects .Also discuss the possibility of the toxicant being a carcinogen and risk assessments would be involved in […]