Araschnia levana is a species of butterfly that breeds several times a year. It has two distinctly colored pupae. Although the genes for pupa color do not differ, those that emerge in spring are orange and those that emerge in summer are brown. The
seasonal color variations in pupae mean that the pupae blend into the colors in their environment. This is an example of
A) a threatened species.
B) an endemic species.
C) a keystone species.
D) phenotypic plasticity.
Answer: D
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Enumerating the viable and total cell concentration of a population of a microbial isolate can be a really laborious task for a microbiologist
Especially when a microbiologist studies the same isolate for several years, it often becomes practical to determine the relationship between optical density (OD) and cell concentration. Once this relationship (determined by a standard curve) is determined, the OD of an isolate in a broth can be routinely used to determine the population's concentration. Why must a standard curve be prepared for each isolate when using OD measurements to determine cell concentration? Also describe an experiment that would generate this type of standard curve. What will be an ideal response?
. The word "animalcule" was coined by
A. Pasteur. B. van Leeuwenhoek. C. Redi. D. Tyndall.
Fructose and glucose are
a. able to combine to form sucrose. b. structurally different. c. monosaccharides. d. simple sugars. e. all of these.
Choose one of the basic patterns of Mendelian inheritance and draw and explain a three-generation family pedigree
illustrating that pattern. What will be an ideal response?