Two molecules with identical molecular formulas but that have different structures are called
A. polymers.
B. isomers.
C. carboyhydrates.
D. hydrocarbons.
E. ring structures.
B. isomers.
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When lipids, phosphates, carbohydrates and RNA were placed on clay, a liposome was formed. Why was the clay an important surface for liposome formation and how is RNA associated with the liposome?
A. Clay acts as a catalyst for the formation of a liposome that can grow and divide. The RNA molecules are enclosed inside the lipid bilayer. B. Clay causes anions to stick together, while the cations are pulled from the carbohydrates. This chemical reaction causes the formation of a carbohydrate- and RNA-based membrane. C. The clay surface provides a nutritional media for the growing and dividing liposome. RNA is incorporated into the liposome as a transmembrane catalyst. D. The positively charged clay surface reacts with the negatively charged phospholipids to create a clay ball. RNA molecules adhere to the outside surface of the clay ball. E. Phospholipds react chemically with the negatively charged clay surface, creating an impermeable membrane. The RNA molecules WOULD be incorporated as part of this membrane.
What do gametes, spores, and the gametophyte generation have in common?
A. They are all diploid. B. They are all haploid. C. They are present in vascular plants only. D. They are all produced by meiosis. E. They are all triploid.
What event that occurred around 10,000 years ago led to genetic changes in wheat?
A) domestication of the wheat plant B) domestication of livestock C) invention of genetic engineering D) mass extinction of herbivores
The difference in the fundamental niche and the realized niche is
A. the realized niche is theoretical while the fundamental niche is the entire niche that an organism can use. B. the fundamental niche is the actual niche that a species occupies while the realized niche is the potential area that the species is capable of inhabiting. C. the fundamental niche is the entire niche that a species is capable of using while the realized niche is just what is being occupied. D. the fundamental niche is smaller than the realized niche.