Diet and exercise reduce the number of fat cells as well as the amount of fat stored in each cell
Indicate whether the statement is true or false
FALSE
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Minick Rosing's analysis of microscopic globules of carbon found in rocks 3.7 billion years old showed that they were somewhat higher in 12C as opposed to 13C. This is significant because ________
A) 13C radiometrically decays into 12C, which lets us calculate the age of these rocks B) life could not have arisen in an environment with excessive 13C C) these carbon globules contain visible remains of cell walls and nuclei D) living things that fix carbon preferentially incorporate 12C over 13C E) meteorites must have brought 13C to the early Earth
Which of the following is an example of an allogenic change that drives succession?
A) seasonal changes in temperature, photoperiod, and light intensity B) increased shading of seedlings by adult trees in a forest C) increased nitrogen availability in soil due to the presence of leguminous plants D) reduced salinity due to surface shading by grasses in a salt marsh
One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome. What is this alteration called?
A) deletion B) inversion C) translocation D) duplication
Cells that have been treated with calcium ions have what sort of capability?
A) They are more capable of taking up foreign DNA than cells that are not treated. B) They are more capable of resisting high temperatures than cells that are not treated. C) They are more capable of resisting high salt concentrations than cells that are not treated.