In the experiments with moss patches described in your text, what were the two factors that affected insect extinction rates within patches?

What will be an ideal response?


patch size; patch connectedness (or corridors between patches)

Biology & Microbiology

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Elucidation of the histone code might  

A.  allow us to turn specific genes on or off. B.  allow the determination of nucleosome composition. C.  lead to chromatin remodeling. D.  allow us to control translation.

Biology & Microbiology

Chemical communication can also occur locally between neighboring cells, or between individuals, through the release of pheromones, coordinating social interactions. The figure below shows epithelial cells in the lungs

When the epithelial monolayer is damaged by mechanical injury, breaching of the barrier allows epithelial cells to sense injury and initiate a repair pathway. When the ligand binds its receptor, it triggers a signaling cascade that stimulates cell division. The ligand (heregulin) is produced by these same cells that produce the receptor, but is released only on the apical side of the epithelium. Mechanical damage allows molecules from apical and basal surfaces to mix. The signaling is best described as: A. paracrine. B. autocrine. C. endocrine. D. synaptic.

Biology & Microbiology

When under attack, ciliates can eject dart-like protein threads from surface organelles called

a. vacuoles. b. gullets. c. trichocysts. d. phagosomes. e. alveoli.

Biology & Microbiology

Which of the following is NOT a verified exception in the use of Koch's postulates?

A) Some diseases have poorly defined etiologies. B) Some pathogens can cause several disease conditions. C) Some human diseases have no other known animal host. D) Some diseases are not caused by microbes. E) Some diseases are noncommunicable.

Biology & Microbiology