Which of the following is true about the geometry of a chemical bond?
A. Single bonds permit free rotation around the bond resulting in more geometric possibilities.
B. Double bonds share two pairs of electrons giving rise to even greater variability.
C. Planar bonds have no rotation and therefore give rise to greater geometric possibilities.
D. The degree of rotation around a bond determines whether the bond will be single or double.
E. The two single bonds of an oxygen atom form a tetrahedron.
A
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Recall Stiling and Drake's experiments using chambers with elevated CO2. What are the implications of their experiment for farmers in the coming decades, if CO2 levels rise as predicted?
A. Farmers will see higher crop productivity and less insect damage, but the crops will be less nutritious. B. Farmers will see higher crop productivity and nutrition, but there will be more insect damage. C. Farmers will see lower crop productivity and nutrition, in addition to more insect damage. D. Farmers will see higher crop productivity, but there will be more insect damage and the crops will be less nutritious.
At the end of gastrulation, which of the following are produced?
a. hollow balls of cells b. embryos with germ layers c. solid balls of cells d. maternal messages e. blastocyst
The citric acid cycle starts with ________ and yields ___________.
Fill in the blank(s) with the appropriate word(s).
Which method of proof is generally more effective at identifying hidden or implicit assumptions of an argument?
A. Proof by induction B. Proof by transposition C. Direct proof D. None of the answers is correct.