How long have prokaryotes lived on Earth?
What will be an ideal response?
Answer: Since at least 3.5 billion years ago
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Explain the transpiration-cohesion-tension mechanism that acts in the xylem of plants
What will be an ideal response?
The structural formula for molecular oxygen is depicted as O=O. What kind of bond holds molecular oxygen
together?
a. ionic b. polar covalent c. single covalent d. double covalent e. triple covalent
What is the defining feature of a eukaryotic cell?
a. cell wall surrounding the cell b. plasma membrane external to the cell wall c. internal membranes surrounding organelles d. ribosomes in the cytoplasm e. large vacuole for storage
The energy required to bring the substrates of a reaction together in the correct way to reach the transition state is called
A. free energy. B. entropy. C. activation energy. D. enthalpy.