Explaining DNA

How is information about DNA structure used as a taxonomic tool? How does the morphological species concept differ from that of a phylogenetic species. How are DNA - DNA hybridization results used to classify organisms? What have "molecular clocks" to do with classification of organisms? Classify your self from kingdom all the way to species. The binomial name of an organism consists of the names of which two classification categories. Why might all evolution be considered coeveolution?

Biology Questions

1. What is the evolutionary significance of the Chlorophyta? Why is Chlamydomonas an important member of this group? 2.Describe and give examples of two separate paths by which multicellular organisms evolved from unicellular organisms. 3.Would you classify the Prostists as chemotrophs or phototrophs. Explain you answer. 4.What organism causes malaria? Describe its life cycle. Indicate which stage of the life cycle would be the easiest and most cost efficient to disrupt in order to control the spread of the disease. 5.List five differences between procaryotic cells and eucaryotic cells.

Bacteria, Fungi and antibiotics

1.When bacteria and fungi are competing for the same resources, the bacteria usually dominate and prevent the fungi from growing. As a result, fungi have adapted so that they can live (and thrive) in environments that are very hostile to bacteria. Give five examples of fungal adaptations that allow them to colonize environments that are hostile to bacteria. 2.Many antibiotics, including penicillin, are derived from fungi. Why do you think fungi produce these substances? In addition, fungi often secrete substances into the foods that they are attacking that make these foods unpalatable or even poisonous to other creatures. What kind of advantage would these substances provide the fungi? ... click for more

Biology questions involving Mosses

1.If you were looking for mosses, what are some of the characteristics of the habitats in which you would took? Explain your answer based on your knowledge of bryophyte life history. 2.Compare and contrast the alternation of generations in mosses, ferns and pines. Which generation is dominant in each case? Is it haploid or diploid? 3.Why do mosses only grow a few centimeters in height, whereas conifers can grow hundreds of feet in height? 4.You have just collected a plant that is totally unfamiliar to you. On close examination you find that it lacks xylem and its multicellular sex organs are enclosed in a layer of sterile (jacket) cells. In addition, its gametophyte stage is free-... click for more

Fungi, Candida infections and Athlete's Foot.

3.Some fungi have played very prominent roles in history. Write a paragraph (250 words approx) about each of the following events. Identify the fungus involved a. Irish Potato Famine b. Witches of Salem 4.Candida (yeast) infections often occur when an individual is taking antibiotics. Explain why this is so. 5.What causes athlete's foot? How is it treated? Why is penicillin ineffective against this organism?