Which mechanism does not repair double strand breaks? recombination photolyase followed by
photoreactivation synthesis-dependent strand annealing (SDSA) non-homologous end joining
The fluctuation test, regarding the origin of mutations, shows that: Mutations occur randomly,
prior to selective pressure The mutation rate fluctuates greatly from organism to organism The
mutation rate fluctuates greatly from cell to cell The mutation rate is fairly even across
organisms The P element in Drosophila: is active in all cells during embryogenesis is a
functional transposon carrying the transposase gene is active when crossing a P female with any
male is a functional retrotransposon carrying the reverse transcriptase gene During bacterial
conjugation, the F element: is transferred as a double stranded molecule is transferred as a single
stranded molecule. 3\' end first enters the donor is transferred as a single stranded molecule. 5\'
end first enters the donor is transferred as a single stranded molecule, the leading end is random
Which of the following could result in a frameshift mutation? deletion of one nucleotide deletion
of three nucleotides deletion of six nucleotides incorporation of a base analog
Solution
1Repair of double strand DNA break is a very serious problem if not solved it may cause
mutation. So there is several repair mechanisms are present. in the above question all
mechanisms can repair DNA break.
recombination repair is of two types homologous recombination and NHEJ ( non homologous
end joining). in NHEJ no homologous template is used and break ends are linked directly.
photolyase is a enzyme activated by light it repairs the mutagenic effect caused by UV light.
such as formation of THYMINE dimer.
SDSA or synthesis dependent strand annealing is a repair mechanism seen in yeast. in this
process repair is initiated by resection of a double strand break to provide 3\' single stranded
DNA..
Wiater Company operates a small manufacturing facility. On January 1,.pdf
1. Wiater Company operates a small manufacturing facility. On January 1, 2015, an asset account
for the company showed the following balances Equipment Accumulated Depreciation
(beginning of the year) $165,000 77,000 During the first week of January 2015, the following
expenditures were incurred for repairs and maintenance Routine maintenance and repairs on the
equipment Major overhaul of the equipment that improved efficiency $1,950 25,000 The
equipment is being depreciated on a straight-line basis over an estimated life of 10 years with a
$11,000 estimated residual value. The annual accounting period ends on December 31 Required:
Indicate the effects (accounts, amounts, and+for increase and for decrease) of the following two
items on the accounting equation, using the headings shown below. (Enter any decreases to
Assets, Liabilities or Stockholder's Equity with a minus sign.) 1. The adjustment for
depreciation made last year at the end of 2014 2. The two expenditures for repairs and
maintenance during January 2015. Item 2014 2015 Assets Liabilities Stockholders' Equity
Solution
Depreciation expense (165000-11000)/10 15400 item
Assets liabilties Stockholders Equity 2014 Accumulated dep -15,400 Depreciation
expense -15,400 2015 Cash -1,950 Repairs & Maintenance -1,950 Equipment
25,000 cash -25,000
