Which of the following biogeochemical cycles contain a mineral component?
A. Oxygen
B. Carbon
C. Nitrogen
D. Phosphorus
E. Water
Answer: D
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What makes the metabolism of Ferroglobus interesting in the context of evolution?
A) Ferroglobus is an anaerobic iron-oxidizing chemolithotrophic autotroph that may represent a key metabolism that allowed for the oxidation of ferrous iron without molecular oxygen. B) Ferroglobus can use H2 or H2S as electron donors in its energy metabolism and is thermophilic, thus representing the earliest hypothesized forms of life. C) Ferroglobus lacks cells wall and becomes encrusted in oxidized iron. D) Ferroglobus is both an iron- and nitrate-reducer and is probably the last common ancestor of all iron- and nitrate-reducing organisms.
Many of the specific functions that are triggered when a cell passes one of the cell cycle checkpoints result from activation of enzymes and other proteins. A common mechanism for this activation is:
A. phosphorylation of specific proteins. B. signal transduction. C. polymerization of tubulin. D. ATP synthesis.
The first person who proposed that small organic molecules could have arisen by chemical evolution was
A. Sidney Fox. B. Thomas Cech. C. Aleksander Oparin. D. Stanley Miller. E. Graham Cairns-Smith.
Answer the following questions true (T) or false (F)
1. The X and Y chromosomes are not homologous, but in the meiosis of sperm formation, they pair and separate in anaphase I as though they were homologous. 2. Mendel's contribution to genetics was the discovery of DNA. 3. Mendel's crosses with pea plants disproved the notion that, when individuals with two different traits are mated, the genetic information blends in the offspring and is not retained as separate elements.