When atoms gain or lose electrons, they become negatively or positively charged. These negatively or positively charged atoms are known as
A. isotopes.
B. ions.
C. isomers.
D. unstable atoms.
B
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Rubisco __________
A. controls photosynthesis B. is a primary control over the global carbon cycle C. carboxylates CO2 D. reduces RuBP E. is only present in leaves
The smallest unit of life that can exist as a separate entity is a(n) ___________.
A. cell B. molecule C. organ D. population E. ecosystem
What are the four classes of large organic molecules important to life on Earth?
A) Carbohydrates, lipids, proteins, and enzymes B) Carbohydrates, lipids, proteins, and sugars C) Carbohydrates, proteins, nucleic acids, and sugars D) Carbohydrates, proteins, lipids, and nucleic acids
Cells can be large if they
A. are metabolically very active. B. have metabolically inactive central regions. C. actively pump nutrients into the cell. D. have a very small surface area compared to their volume.