Will our modern forests eventually become coal?
What will be an ideal response?
While it is impossible to predict the future, the answer would be not likely. The primary event that turned the ancient forests to coal was the relatively rapid rising and falling of the seas, leading to layer after layer of decayed tree matter pressed in the sediment. The current climate of the Earth is not experiencing this, and thus our current forests will likely decay into non-coal organic matter.
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Which of the following is not related to the five fundamental characteristics of life?
A) A bacterial cell divides to produce two cells B) Sugars are transported on carrier proteins into cells across the plasma membrane C) Sugars are broken down inside cells to produce energy D) The gene that specifies skin color in frogs is expressed during its development from a tad pole into an adult frog E) Giraffes have longer necks so that they can reach food sources unavailable to other animals
The primary reason certain plants grow well as houseplants is because they may be adapted to:
A. dry growing conditions B. areas that normally lack direct sunlight C. areas that get very little mineral content in the soils D. growing short branches E. lack of temperature changes
Each of the following is correct about cholera and its effect on G-protein–adenylyl cyclase activity except
A) Vibrio cholera bacteria colonize the gut. B) Cholera toxin is secreted by Vibrio cholera bacteria. C) Intestinal cells infected with cholera toxin import abnormally high levels of salts and fluids into the bloodstream. D) Cholera toxin alters Gs? so that it no longer hydrolyzes GTP. E) Intestinal cells infected with cholera toxin maintain abnormally high cAMP levels.
Ribosomes are complex aggregates of
A. RNA and DNA. B. RNA and sugars. C. DNA and proteins. D. nucleosomes and RNA. E. RNA and proteins.