Which one of the following statements about carbon is correct?
A. Each of carbon's three valence electrons shares a bond with another atom.
B. Carbon-carbon single bonds allow for free rotation around the bond; carbon=carbon double bonds do not allow for free rotation around the bond.
C. The spacial orientation of carbon's bonds results in carbon resting in the center of a three-dimensional structure referred to as a hexahedron.
D. Carbon is not only the most abundant element on Earth; it is believed to be the most abundant element in the universe.
E. Single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.
Answer: B
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Which of the following statements is true regarding the carbon cycle?
A. It cycles both carbon and H2O. B. It evolved before plants appeared on Earth. C. It was based on microbes during the early stages of Earth's history. D. It involves both long- and short-term processes. E. All of these statements regarding the carbon cycle are true.
Which is the normal start codon for protein synthesis?
a. AUG b. UAA c. UAG d. UGA e. GGU
RNA primers are added, what do they provide to DNA polymerase that is essential to its function?
a. a free 5' phosphate b. partially double stranded DNA c. RNA d. a free 3' OH
A diffuse nerve net would be found in which of the following animals?
A) Insect B) Jellyfish C) Flatworm D) Human E) Octopus