BIS 2A MIDTERM 2|50 Questions With Complete Solutions

On early Earth, the first things that looked like they might be classified as living organisms used iron sulfur clusters as catalysts. If these "naked" iron sulfur clusters can catalyze reactions, why do our cells instead use proteins carrying iron sulfur clusters as catalysts? a. To decrease substrate specificity b. To increase substrate specificity c. To prevent spontaneous oxidation of the iron in the cluster d. a and c e. b and c - ️️e. b and c Two tabby (striped) cats are bred together, and produce 12 kittens. 9 are tabby, but 3 are solid black. From this we can conclude: a. Just one of the cats had a black parent. b. Both cats had a black parent. c. Tabby is recessive to black. d. Black is recessive to tabby. e. B and D are correct - ️️d. Black is recessive to tabby. The drop in H2 concentration in the Earth's atmosphere and oceans made life much more difficult for bacteria that specialize in: a. Fermentation b. Aerobic respiration c. Oxygenic photosynthesis d. Nonoxygenic. photosynthesis e. Methanogenesis - ️️e. Methanogenesis