Question

7. What are prions? a. Mobile segments of DNA b. Tiny molecules of RNA that infect plants c. Viral DNA that has to integrate into the host genome d. Misfolded versions of normal brain protein e. Viruses that invade bacteria 28. The difference between vertical and horizontal transmis plant to its of plant viruses is that , and horizontal transmission is one plant spreading thaves to lowe t the same vertical transmission is the spread of viruses from upper among leaves abushes and out plant, and horizontal transmission vertical transmission is the spread from trees s transmission of a virus from a parent plant to its progeny b. is the spread of a virus among leaves at the same level. Plants, and d of viruses from trees and tall plants to bushes and other C. the tical transisia transmission is spread of viruses among plants of similar size. transmission is the transfer of DNA from one type of plant virus d. to another, and horizontal transmission is the exchange viruses of the same type. of DNA between two plant l transmission is the transfer of DNA from a plant of one species to a erent species, and horizonta I transmission is the spread of viruses among plants of the same species 29, Assimilation of external DNA by a cell is an example of b. C. d. e. transduction transposition translation transformation conjugation 30. What does bacterial mating involve? a. b. exchange of egg and sperm formation of a conjugation tube for the transfer of male DNA c. sex pili that draw the cells together so mRNA can be inserted d. itergration of male and female DNA into a conjugation tube e. binary fission of a bacterial cell both bacteria Which of the following characteristics, structures, or processes is common to and viruses? 1. a. b. c. d. cell division e. metabolism ribosomes genetic material composed of nucleic acid independent existence If all the bacteria on Earth suddenly disappeared, which of the following would be the most likely and most direct result? a. The number oforganisms on Earth would decrease by 10-20 % b. Human population would thrive in the absence of disease c. There would be little change in the Earth's ecosystems. d. Recycling of nutrients would be greatly reduced, at least initially Earth's total photosynthesis would decline markedly e.

Answer 1

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