A store sells a variety of sets for building molecular models. The sets are described by the diagram below. Each circled letter
represents a box of 6 model atoms of one element. For example, the circled letter "P" represents a box with 6 model phosphorous atoms.
-----Set 1 has 12 carbon, 12 oxygen, and 18 hydrogen atoms.
-----Set 2 has 12 carbon, 12 oxygen, and 24 hydrogen atoms.
-----Set 3 has 6 carbon, 12 oxygen, 12 hydrogen, 6 nitrogen, and 6 phosphorous atoms.
-----Set 4 has 6 carbon, 6 oxygen, 6 hydrogen, and 6 phosphorous atoms.
Which change to one of the kits would make it useful for modeling proteins?
_A. Set 1, add a box for phosphorous (P) atoms.
_B. Set 2, add a box for sulfur (S) atoms
_C. Set 3, replace the box of phosphorous (P) atoms with a box of sulfur (S) atoms
_D. Set 4, replace the box of oxygen (O) atoms with a box of nitrogen atoms (N)
-----Set 1 has 12 carbon, 12 oxygen, and 18 hydrogen atoms.
-----Set 2 has 12 carbon, 12 oxygen, and 24 hydrogen atoms.
-----Set 3 has 6 carbon, 12 oxygen, 12 hydrogen, 6 nitrogen, and 6 phosphorous atoms.
-----Set 4 has 6 carbon, 6 oxygen, 6 hydrogen, and 6 phosphorous atoms.
Which change to one of the kits would make it useful for modeling proteins?
_A. Set 1, add a box for phosphorous (P) atoms.
_B. Set 2, add a box for sulfur (S) atoms
_C. Set 3, replace the box of phosphorous (P) atoms with a box of sulfur (S) atoms
_D. Set 4, replace the box of oxygen (O) atoms with a box of nitrogen atoms (N)
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