It is thought by scientists that the earliest living organisms
a. originated on another planet.
b. were photosynthetic.
c. used carbon monoxide as a carbon source.
d. used aerobic respiration.
e. made use of sulfur and hydrogen gas as energy sources.
E
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If all functional groups are removed from an organic molecule, leaving only a hydrocarbon chain, the molecule becomes a:
A. Lipid B. Carbohydrate C. Protein D. Nucleic acid
Use the following information to answer the following question(s): You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms."Your statement, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms," is called a(n) ________.
A. observation B. theory C. conclusion D. hypothesis
Assume a mitochondrion contains 58 NADH and 19 FADH2. If each of the 77 dinucleotides were used, approximately how many ATP molecules could be generated as a result of oxidative phosphorylation (chemiosmosis)?
A) 36 B) 77 C) 173 D) 212 E) 1102
If a mixture of bacteriophages, some labeled with radioactive sulfur and others labeled with radioactive phosphorus, is placed in a bacterial culture, the bacteria will eventually contain ____.
A. primarily radioactive sulfur B. primarily radioactive phosphorus C. both radioactive sulfur and phosphorus D. neither radioactive sulfur nor radioactive phosphorus E. complete viruses with radioactive sulfur coats