One currently accepted theory suggests that the bodies in the Oort cloud formed
a. near the present orbits of the terrestrial planets and were then ejected by them.
b. near the present orbits of the Jovian planets and were then ejected by them.
c. right there in the Oort cloud very far from the Sun.
b
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What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds require carbon while ionic bonds do not. B) Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms. C) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between charged atoms. D) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between charged atoms. E) Covalent bonds involve the transfer of electrons between charged atoms; ionic bonds involve the sharing of electrons between atoms.
In the reaction to the right, pyruvate is converted to acetyl-CoA. Which if any of the following statements concerning this reaction is true? There may be more than one correct answer
A. CO2 is the most oxidized and therefore least energetic form of carbon. B. NAD+ is more reduced than NADH. C. NAD+ is an oxidizing agent. D. This is not an oxidation/reduction reaction, that is, no electrons have moved. E. This reaction harnesses the last of the remaining potential energy from glucose.
Oxygen is brought into the body by the respiratory system. Which system transports the oxygen to cells where it is needed?
a) lymphatic system b) immune system c) circulatory system d) integumentary system
Consider organisms that are eukaryotic, are found in both unicellular and multicellular forms, may resemble plants but are not photosynthetic, have chitin in their cell walls, and absorb organic nutrients from decomposing material in the environment. These organisms would be classified as which of the following types of organisms?
a. archaea b. bacteria c. protozoa d. fungi