Curtis and McIntosh created a scale of an environmental gradient based on changes in physical characteristics or community composition along that gradient. What term did they apply to this index?
A) the climax index
B) the continuum index
C) the successional index
D) the tolerance index
Ans: B) the continuum index
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Proteins on the cell surface label the cells as "self", identifying them to the immune cells as belonging to the organism
Indicate whether the statement is true or false.
In fruit flies, brown eyes can be caused by recessive mutant alleles of any one of three genes: pn (prune), bw (brown) or ry (rosy). The pn gene is X-linked, bw is on the second chromosome, and ry is on the third chromosome. One wild-type allele of each of the three genes must be present for eyes to be red (wild type). Suppose that two brown-eyed flies are crossed and their progeny consist of brown-eyed sons and red-eyed daughters. Which mutation is responsible for the brown eyes in the parental female?
A) pn B) bw C) ry D) either bw or ry E) any of the three—pn, bw, or ry
________ is the process of cell or tissue change in development
A) Transformation B) Morphogenesis C) Development D) Change E) None of these
Which factor explains a uniform distribution of individuals in a population?
A) soil nutrients available to a species of plant B) territoriality in a species of bird C) oxygen levels in a pond, where an oxygen-dependent bacterial species lives D) food availability for humans living in a certain geographic area