Protozoan classification used to be based on their means of
A. locomotion.
B. growth.
C. reproduction.
D. obtaining nutrients.
A
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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.
Recombinant DNA is any DNA that ____
a. has been cut by restriction enzymes b. is at least four to eight base pairs in length c. has had its gene sequence rearranged d. consists of DNA from two or more organisms of the same or different species e. inserted into plasmids
__________ species are likely to become endangered in the future. Fill in the blank(s) with the appropriate word(s)
From the relative positions of genes on the
chromosome illustration below, we expect a. the highest frequency of crossing over between genes A and D. b. more crossing over between C and D than between A and B. c. more crossing over between A and B than between B and C. d. the lowest frequency of crossing over between B and C. e. none of these.