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As before. Question 1 0.5 pts Which of the following does not cause a mutation? O...
Question 48 1 pts Please select all the factors that would impact the effectiveness of an antimicrobial agent (such as bleach) at killing all the microbes on a surface: Duration (time) of exposure of the agent to the surface Concentration of Antimicrobial agent used on the surface Microbial characteristics of the microbes on the surface Number of microbes on the surface before treatment Characteristics and identity of the Antimicrobial agent used on the surface Environmental conditions of the surface (organic...
1. How would a mutation in the poly(A)-binding protein gene affect translation? How would an electron micrograph of polyribosomes from such a mutant differ from the normal pattern? 2. Eukaryotes have repair systems that prevent mutations due to copying errors and exposure to mutagens. What are the three excision-repair systems found in eukaryotes, and which one is responsible for correcting thymine-thymine dimers that form as a result of UV light damage to DNA? 3. What is the name given to...
Question 13 1 pts Which of the following apply to the function of Telomerases (Choose all that apply]: Protect critical gene functions by moving them away from the end of a chromosome Leaves a 3' overhang on linear DNA Leaves a 5' and a 3' overhang on linear DNA Prevent linear chromosomes from shortening after each round of replication Leaves a 5-overhang on linear DNA Question 14 1 pts Which of the following statements are TRUE about thymine dimers? (Choose...
1. In a "silent" mutation A) The codon that mutates does not cause a change in the amino acid specified B) The codon that mutates causes change in the amino acid specified C) The codon that mutates cause a stop codon to occur instead of the placement of an amino acid D) The mutation does not occur in a codon E) The mutation is not in DNA 2. In a "nonsense" mutation A) The codon that mutates does not cause...
QUESTION 1 In E. coll, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. Which of the following would you expect as a result of this mutation? O A) Additional proofreading will occur. OB) No replication fork will be formed. OC) Replication will occur via RNA polymerase alone. OD) Replication will require a DNA template from another source QUESTION 2 The model of DNA replication is called QUESTION 3 Which...
Question 9 1 pts Why does cellular aging (or senescence) occur in eukaryotic organisms? O DNA in eukaryotes is linear, and the ends of the DNA shorten each time replication occurs Telomeres extend the length of the DNA until it becomes too unwieldy to replicate well Extracellular signals tell the cells to stop dividing The nucleotides in the DNA eventually degrade and don't adhere well to each other anymore Question 10 1 pts What evidence do we have against the...
thank you!! Question 1 0.5 pts It has been shown that inhibition of a key chromatin remodeling complex known as NURD. by deleting one of its subunits, can result in a significant increase in the efficiency of reprogramming of somatic cells into pluripotent stem cells. The reprogramming is normally done by the induced expression of a battery of transcription factors in the somatic cells, but is typically not very efficient. Such an observation suggests that the NURD complex is normally...
QUESTION 5 Which one of the following explains the RNA molecule the best? O A. It contains uracil in place of thymine O B. It is generally a single strand molecule O C. Its sugar is ribose O D. All of the above QUESTION 10 A form of replication in which the two parental DNA strands remain together following DNA replication is O semi-conservative O conservative o dispersive o all of the above QUESTION 11 Which of the following is...
Which of the following is an example of a spontaneous mutation? Yeast DNA is exposed to acridine dye, resulting in distortion of the DNA double helix. Human cells are exposed to X-rays for a prolonged period of time, leading to multiple DNA strand breaks. DNA polymerase III accidently mismatches a G to a T during Escherichia coli DNA replication, resulting in a silent mutation. Plasmodium vivax cells are exposed to ultraviolet radiation, leading to the formation of thymine dimers within...
1)Repairing damaged DNA is essential to maintaining the integrity of the genome. One type of repair is known as nucleotide excision repair. In this system, which order do the necessary enzymes act? A) exonuclease, DNA polymerase III, RNA primase B) helicase, DNA polymerase I, DNA ligase C) DNA ligase, nuclease, helicase D) DNA polymerase I, DNA polymerase III, DNA ligase E) endonuclease, DNA polymerase II, DNA ligase 2) What might be the result if all cells had functioning telomerase? A)...