An organism's ________ is its lifetime pattern of growth, development, and reproduction
Fill in the blank(s) with correct word
life history
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Answer the following statements true (T) or false (F)
1. A simple dot matrix is the best method to identify homologous sequences from a known sequence. 2. If a gene's sequence is compared among several different vertebrates and they are found to be 95% homologous, one can assume that the genes are derived from the same ancestral gene. 3. Sequences that are alike will produce a horizontal line in a dot matrix analysis. 4. The current genome databases are biased towards species that are important from a research, medical, or agricultural perspective.
The keystone species in a Pacific Northwest
Old Growth Forest
a. is the Spotted owl, that preys on rodents. b. are the mice that feed on mushrooms and truffles. c. are the Douglas fir trees that are dominant species. d. are the Douglas squirrels that spread the seeds of the Douglas fir. e. are the piliated woodpeckers that nest in Douglas fir
Which of the following would be an example of the bottleneck effect?
a) one species of insect splitting in two species without any sort of physical isolation b) certain plants having genetic advantages that allow them to produce more offspring c) most of the fish in a pond being poisoned, leaving only a few survivors d) birds transporting seeds from one island to another
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A) the mucus secreted by the mucous membrane physically traps microbes. B) the mucus contains a variety of antimicrobial chemicals and molecules. C) both the mucus and the outer layer of cells are shed frequently. D) the mucus is a physical trap that contains a variety of antimicrobial chemicals. E) the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.