Each species has a typical survivorship curve. Identify the labeled curves and briefly describe the typical survival rates and when death occurs. Give examples of organisms that have this type of survivorship curve.
What will be an ideal response?
"A" is a type I survivorship curve. A type I curve is characteristic of a population in which most individuals survive well past the midpoint of the life span and death does not come until near the end of the life span. Large mammals and humans in well-developed countries have this type of curve. "B" is a type II curve, in which survivorship decreases at a constant rate throughout the life span. Many small animals have this type of curve where death is not related to age. "C" is a type III curve, which is typical of a population where most individuals die very young. This type of curve occurs in many invertebrates, fishes, and humans in less-developed countries.
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People often use the term "theory" in a variety of ways, but to a scientist, a theory has a specific meaning. Briefly describe the important features of a scientifically based theory
What will be an ideal response?
Drugs used to treat AIDS and herpes virus infections are synthetic versions of compounds found in ____
a. sea anemones b. sponges c. roundworms d. cnidarians e. planaria
Gene therapy is a modern approach to preventing infectious disease.
Answer the following statement true (T) or false (F)
Which of the following are part of the endomembrane system?
a. lysosomes and Golgi apparatus b. nuclear envelope and peroxisomes c. vesicles and mitochondria d. vacuoles and vesicles