Why would a recombinant DNA molecule be inserted into a host cell?
a. It can protect the recombinant DNA.
b. Restriction enzymes can only be used inside of a cell.
c. It can be copied, transcribed, and translated into a desired protein.
d. Plasmids cannot be isolated outside of a host cell.
Answer: c. It can be copied, transcribed, and translated into a desired protein.
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For many mammals, egg laying is a character that has been replaced by:
A. live birth. B. asexual reproduction. C. sexual reproduction.
At the end of binary fission, how many cells have been created?
a. 1 b. 2 c. 3 d. 4
The full range of energy in sunlight can best be described as:
A. infrared radiation B. ultraviolet light C. visible light D. electromagnetic radiation
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122-130 meters. The tallest know tree on Earth is 112.7 meters. Which of the following most likely limits the height of trees?
A. the amount of transpiration in leaves B. the amount of photosynthesis in leaves C. the amount of energy needed to pump water to the tops of the trees D. the strength of water cohesion E. the ability to take up CO2