Based on your understanding of the ways in which signal transmission mediates cell function, which of the following predictions is most consistent with the information given above?
(A) In an environment with low fixed nitrogen, treating the Anabaena cells with a calcium-binding compound should prevent heterocyst differentiation.
(B) A strain that overexpresses the patS gene should develop many more heterocysts in a low fixed nitrogen environment.
(C) In an environment with abundant fixed nitrogen, free calcium levels should be high in all cells so that no heterocysts develop.
(D) In environments with abundant fixed nitrogen, loss of the hetR gene should induce heterocyst development.
Answer: (A) In an environment with low fixed nitrogen, treating the Anabaena cells with a calcium-binding compound should prevent heterocyst differentiation.
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The energy made available during cell respiration and fermentation is used to make ________, which is then available to provide energy for cellular work.
Fill in the blank(s) with the appropriate word(s).
Species of the genus Thiobacillus ________.
A. are ubiquitous in soil, freshwater, and marine environments B. produce acids that leach metals out of ore C. oxidize inorganic sulfur compounds and produce ATP D. All of the choices are correct.
The effects of mutation in human somatic cells have a low probability of causing harm because only _______ of human DNA encodes gene products.
A. greater than 5 percent B. less than 2 percent C. less than 4 percent D. greater than 8 percent E. greater than 3 percent
Other neurodegenerative diseases also function through aggregation of misfolded proteins. However, the initial protein aggregates are different in each disease. Work on HD may still be vital to treating other diseases as ________
A) other neurodegenerative diseases use axonal transport to spread to unaffected cells B) not all neurodegenerative disease spread C) the method of aggregation is the same in all neurodegenerative disease D) the method of disaggregation is similar in all neurodegenerative disease