Question

In: Biology

Which of the following statements about DNA repair is correct Group of answer choices during excision...

Which of the following statements about DNA repair is correct

Group of answer choices

during excision repair, an exonuclease is the first enzyme involved in removing a single-stranded segment of DNA from the template strand

none of the answer is correct

during mismatch repair, a methylated guanine in the consensus sequence GATC found on the parent strand activates the Mut complex

the Okazaki fragments synthesized during base excision repair are synthesized in a 3’ -- > 5’ fashion

repair of methylated DNA requires a set of proteins operating with the following order: endonuclease, exonuclease, DNA polymerase I, ligase and demethylase

Expert Solution

Statement 1:" During excision repair, an exonuclease is the first enzyme involved in removing a single-stranded segment of DNA from the template strand"

is False because in Base excision repair GLYCOSYLASE is the first enzyme that recognizes and removes the damages base by hydrolyzing glycosidic acid. And the resultant basic sugar is being removed from DNA backbone by endonucleolytic step.

Statement 2:" none of the answer is correct"

is also False

Statement 3: "during mismatch repair, a methylated guanine in the consensus sequence GATC found on the parent strand activates the Mut complex"

is False because the consensus sequence GATC is methylated at Adenine and not Guanine.Also, the newly synthesized strand is hemimethylated which when replicated synthesize a strand that lacks methyl group which gets recognized and bind to Mut H , which recruit MutL and MutS and then after activates Mut complex.

Statement 4: "the Okazaki fragments synthesized during base excision repair are synthesized in a 3’ -- > 5’ fashion"

is False because DNA polymerase is unidirectional and synthesis of new strand always occurs in 5' to 3' direction even for Okazaki fragment synthesis during base excision repair.

Statement 5: "repair of methylated DNA requires a set of proteins operating with the following order: endonuclease, exonuclease, DNA polymerase I, ligase and demethylase"

is True because in case of Ecoli ,sequence GATC is widely distributed on entire genome and repair of these DNA uses protein in the order

Endonuclease to create nick in the unmethylated strand

Exonuclease to remove ssDNA between nick and mismatch.

DNA polymerase to remove mismatch .Followed by ligase and demethylase

So statement 5 is correct.

gladiator answered 2 years ago

Which of the following statements is correct? Group of answer choices None of these is correct....

Which of the following statements is correct? Group of answer choices None of these is correct. The demand for iPads is more elastic than the demand for tablets in general. Here, iPads is one kind of tablets. The demand for a necessity good is more elastic than the demand for a luxury good. The demand for cell phones is more elastic over a short period of time than over a long period of time

Which of the following statements about cash flows is not correct? Group of answer choices Cash...

Which of the following statements about cash flows is not correct? Group of answer choices Cash flow from investing activities decreases when the principal of a loan is paid. Cash dividends decrease cash flow from financing activities. Cash flow from investing activities increases when equipment is sold. Cash flow from operating activities decreases when interest on a loan is paid.

Which of the following statements about evolution is not correct? Group of answer choices Genetic variations...

Which of the following statements about evolution is not correct? Group of answer choices Genetic variations that increase a specimen’s likelihood of reproducing will eventually be adopted by the population. Natural genetic variations will occur within offspring of a species. An evolutionary trait can be adopted population-wide as quickly as within a single generation. A species can produce more offspring than its environment can support.

Which of the following statements is CORRECT? Group of answer choices An increase in the DSO,...

Which of the following statements is CORRECT? Group of answer choices An increase in the DSO, other things held constant, could be expected to increase the ROE. An increase in the DSO, other things held constant, could be expected to increase the total assets turnover ratio. If two firms have the same ROA, the firm with the most debt can be expected to have the lower ROE. The ratio of long-term debt to total capital is less likely to experience...

Which of the following statements is correct? Group of answer choices If a project with normal...

Which of the following statements is correct? Group of answer choices If a project with normal cash flows has an IRR greater than the WACC, the project must also have a positive NPV. A project’s MIRR can never exceed its IRR. If Project A’s IRR exceeds Project B’s, then A must have the higher NPV. If the NPV is negative, the IRR must also be negative. If a project with normal cash flows has an IRR less than the WACC,...

Which of the following statements is CORRECT? Group of answer choices The WACC is not related...

Which of the following statements is CORRECT? Group of answer choices The WACC is not related to the cost of debt or equity capital The WACC will be changing for the changing market value of the shares and debentures The WACC should be the hurdle rate for evaluating all projects The WACC is the expected rate of return for the market

Which of the following statements is(are) correct? Group of answer choices Assume that goods A and...

Which of the following statements is(are) correct? Group of answer choices Assume that goods A and B are substitutes. Suppose a technology improvement in the production of good A and an increase in the price of good B. If everything else remains the same, in the market of good A, the equilibrium price decreases but the effect on the equilibrium quantity depends on the magnitudes of the shifts in supply and demand Assume that goods M and N are complements....

Which of the following statements is correct? Group of answer choices One disadvantage of forming a...

Which of the following statements is correct? Group of answer choices One disadvantage of forming a corporation is that equity investors are usually exposed to less liability than they would be in a partnership. Corporations face more regulations than sole proprietorships. One disadvantage of operating a business as a sole proprietor is that the firm is subject to double taxation, because taxes are levied at both the firm level and the owner level. It is generally less expensive to form...

Which of the following statements is correct? Group of answer choices The dividend theory espoused by...

Which of the following statements is correct? Group of answer choices The dividend theory espoused by Modigliani and Miller would say that firms would be better served with a constant pattern of growing dividends. The tax differential dividend theory by Litzenberger and Ramaswamy, would say that firms will be better off to pay a higher amount of dividends because the lower tax rates associated with dividends as compared to capital gains. The bird-in-the-hand theory would say that a higher dividend...

Which of the following statements is CORRECT? Group of answer choices 1) The use of debt...

Which of the following statements is CORRECT? Group of answer choices 1) The use of debt financing will tend to lower the basic earning power ratio, other things held constant. 2) A firm that employs financial leverage will have a higher equity multiplier than an otherwise identical firm that has no debt in its capital structure. 3) If two firms have identical sales, interest rates paid, operating costs, and assets, but differ in the way they are financed, the firm...