According to the selfish DNA hypothesis, TEs exist becausea. they offer the host a selective advantage.b. they have characteristics that allow them to multiply withinthe chromosomal DNA of living cells.c. they promote the expression of certain beneficial genes.d. all of the above.
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According to the selfish DNA hypothesis, TEs exist because
a. they offer the host a selective advantage.
b. they have characteristics that allow them to multiply within
the chromosomal DNA of living cells.
c. they promote the expression of certain beneficial genes.
d. all of the above.
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- A form of genetic transfer that involves the uptake of a fragment of DNA from the environment is calleda. conjugation.b. transduction.c. transformation.d. all of the above.You have just discovered a protein in mice that may be aneffective cure for cancer, but it is present only in tiny amounts.Describe the steps you would use to produce this protein intherapeutic amounts. Which host would you want to clonethe gene into and why? Which host would you use to expressthe protein in and why?Because cancer cells do not normally die, does this imply that if people attempted to extend their lives, it would most likely be through the employment of cancer cells? Could cancer be used as a vector to modify cells or shape it into what is desired?
- Which of the following is NOT a method by which bacteria can be resistant to antibiotics? Select one: a. Utilise an alternate pathway of gene expression that is not targeted by the antibiotic. b. Alter the binding site of the antibiotic, to either prevent it binding, or remove it from the site. c. Production of enzymes that bind to and break down the specific antibiotic. d. Production of a cell membrane pump that translocates antibiotics outside the cell. A potential side effect of antibiotic use is a secondary bacterial or fungal infection, usually associated with regions like the skin, upper-respiratory tract or genitalia. What is the most likely reason for the formation of these secondary infections? Select one: a. Antibiotics do not work on viruses, so they are able to establish infections in these locations. b. Organisms that are antibiotic resistant are usually more virulent, meaning they can survive and cause infection. c. The antibiotic kills off normal flora, providing an…Which of the following is true of reverse transcriptase?a. It is required for the movement of DNA transposons.b. It catalyzes the synthesis of DNA from RNA.c. It is required for the transposition of retrotransposons.d. b and c are correct.Some strains of Escherichia coli bacteria have acquired the ability to produce the harmful Shiga toxin, normally produced by Shigella dysenteriae. Which statements best explain why this occurs? Mark all that apply. A. conjugation between two different species of bacteria allowed both strains of bacteria to express a virulence factor B. transformation resulted in expression of a virulence factor C. horizontal gene transfer between different species of bacteria D. transduction of a specific gene resulted in expression of new traits
- The Ames testa. provides a way to determine if any type of cell has experienced amutation.b. provides a way to determine if an agent is a mutagen.c. allows researchers to experimentally disrupt gene activity by causinga mutation in a specific gene.d. provides a way to repair mutations in bacterial cells.e. does all of the above.There have been recent outbreaks of dog flu in the US. Why doesn't this virus infect humans? A) The virus can replicate in cells of all species but can only egress from dog cells. B) The genetic code of the virus is the same as that in dog cells but is different from other organisms. C) The virus can only attach to dog cells. D) The virus can enter cells of all species but can only replicate in dog cells.Hox genes are activated in specific regions of the body (e.g. back of the head) and activate other genes to build specific structures in those regions. This was largely discovered by looking at the effects of mutants of the various hox genes. What other technique would provide information on the action of hox genes? Group of answer choices A. copy hox genes and place them in bacteria B. copy hox genes and place them in plants C. completely remove all hox genes from the genome D. change the control of hox genes so that they are expressed in different body regions E. reverse the order of the hox genes on the chromosome
- Which genes can be transferred by all three methods of horizontal gene transfer? a. capsule production b. toxin production c. F factord. drug resistanceCan we just insert a gene on an organism? In plants, the use of Agrobacterium, wers there any success or failures?why do the bacteria grow up to the edge of the area with antibiotics, pause, then continue to grow across the area with antibiotics? A) The antibiotics caused mutations in the DNA of the bacteria, making them resistant to the antibiotics. B) The bacteria mutated as a survival response to the presence of antibiotics, enabling the bacteria to become resistant to the antibiotics. C)A few bacteria experienced random mutations in their DNA, which allowed some of them to grow even though antibiotics were present. D) Researchers added antibiotic resistant bacteria to the culture, so that the bacteria would continue to grow across the area with antibiotics.