Linings of the upper respiratory passageways
What will be an ideal response?
Pseudo stratified columnar
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Why do moderate levels of disturbance result in an increase in community diversity?
A) Habitats are opened up for less competitive species. B) Competitively dominant species infrequently exclude less competitive species after a moderate disturbance. C) The environmental conditions become optimal. D) The resulting uniform habitat supports stability, which in turn supports diversity. E) Less-competitive species evolve strategies to compete with dominant species.
DNA replicates during the ________ phase of the cell cycle.
A) G1 B) G2 C) G3 D) S
Most ecologists believe that the average global carrying capacity for the human population is between
A) 5 and 6 billion. B) 6 and 8 billion. C) 10 and 15 billion. D) 15 and 20 billion. E) 20 and 25 billion.
In their 1953 paper on the double-helical structure of DNA, Watson and Crick famously wrote: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material." What did they mean?
A. Sexually reproducing organisms swap their DNA. B. The sugar-phosphate backbone of DNA holds the helix together in a way that allows the genetic information to be copied. C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand. D. When a cell divides, each DNA helix is split between the daughter cells.