ery adherse conditions, such as freezing, drying or high temperatures. DNA shoul
ID: 206529 • Letter: E
Question
ery adherse conditions, such as freezing, drying or high temperatures. DNA should be lo within, or be part of which structures? 29In a bacteriam that possesses antibiotic resissance and the potentinl to persist throu I nucleoid region 2 endospore 3· fimbriae 4 plasmids A) Ionly B) 1 and 2 only C) I and 4 only D) 2 and 4 only E) 1,2, and 4 only a virus in a new host )" with a lethality rate in e emerging virus 30) An example of an of50% is A) influenza B) Ebola virus C) Hepatitis B D) Variola virus E) Yelloe fever 31) What is dhe primary ecological role of prokaryotes? A) parasituring eukaryotes, thus causing diseases B) breaking down organic matier materials in extreme D) adding methane to the atmosphere E) serving as primary producers in terresurial environments 32) What is the goal of bioremediation? 8) A) to improve human health with the help of living organisms such as bacteria. to clean up areas polluted with toxic compounds by using bacteria. D) to improve bacteria for production of useful chemicals c to improve soil quality for plant growth by using bacteria. 33) Which of the following pairs of protists and their characteristics is mismatched? A) apicomplexans-internal parasites. 8) golden algae-planktonic producers C) euglenozoans-unicellular flagellates. D) ciiates-red tide organisms E entamoebas-ingestive heterotrophs. A) endospore. 8) sex pilus. C) capsule. defenses of host organisms, especially present n all bacteria, this cell covering often enables cells that possess it to resist the their phagocytic cells. D) flagellum. E cell wal.Explanation / Answer
29) Answer - E,
The bacterial chromosome is a single circular molecule of naked DNA tightly coiled within the nucleiod. A nucleoid has no ribosome and nucleolus. The bacterial chromosome is permanently attached to plasma membrane at one point, It is thought that this anchoring may help in the seperation of the two chromosomes after DNA replication.
In addition to a chromosome, certain bacteria contain a small extrachromosomal circular DNA called plasmid. A plasmid may confer resistence to one or more antibiotics upon the bacterial cell.
Endospore formation is in dorment form when lack of nutrients and usually occur in Gram-positive bacteria they are tough and non reproductive.
30) Answer - B)
Fruit bats are natural Ebola virus hosts. Then introduced into human population through blood, secretions through Fruit bats, Chimpanzees, First outbreaks occured in Africa. The average Ebola virus lethality rate is around 50%
31) Answer - B)
Prokaryotes play major role in Carbon and Nitrogen cycles. Bacteria and Fungi are decomposers So primary ecological role of Prokaryotes is breaking down organic matter.
32) Answer - B)
33) Answer - D)
34) Answer - C)
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