Answer:
The correct/closest option is b
Explanation:
Restriction enzymes are enzymes (endonucleases) that cut short DNA strands at specific sites. Hence, each restriction enzyme has it's own specific site (between two bases) it cuts at. There are two types of end that can be produced by this cut; the blunt end and the sticky end.
A restriction enzyme recognizes (palindromic sequence) and cut in it's own specific end.
For example, if a restriction enzyme cuts between a guanine (G) and an adenine (A), and it cuts a palindromic double stranded DNA in the manner below, it produces a sticky end.
G║AATTC
CTTAA║G
And if a restriction enzyme cuts between guanine (G) and cytosine (C) in the manner below, it produces a blunt end.
GGG║CCC
CCC║GGG
Hence, from the question, restriction enzymes (although chosen by the scientist based on desired sequence to be cut) recognize the sticky or blunt ends itself.
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Answer:
a) Ql=33120000 kJ
b) COP = 5.6
c) COPreversible= 29.3
Explanation:
a) of the attached figure we have:
HP is heat pump, W is the work supplied, Th is the higher temperature, Tl is the low temperature, Ql is heat supplied and Qh is the heat rejected. The worj is:
W=Qh-Ql
Ql=Qh-W
where W=2000 kWh
Qh=120000 kJ/h
![Q_{l}=14days(\frac{24 h}{1 day})(\frac{120000 kJ}{1 h})-2000 kWh(\frac{3600 s}{1 h})=33120000 kJ](https://tex.z-dn.net/?f=Q_%7Bl%7D%3D14days%28%5Cfrac%7B24%20h%7D%7B1%20day%7D%29%28%5Cfrac%7B120000%20kJ%7D%7B1%20h%7D%29-2000%20kWh%28%5Cfrac%7B3600%20s%7D%7B1%20h%7D%29%3D33120000%20kJ)
b) The coefficient of performance is:
![COP=\frac{Q_{h} }{W}=\frac{120000 kJ/h*14(\frac{24 h}{1 day}) }{2000 kWh(\frac{3600 s}{1 h}) } = 5.6](https://tex.z-dn.net/?f=COP%3D%5Cfrac%7BQ_%7Bh%7D%20%7D%7BW%7D%3D%5Cfrac%7B120000%20kJ%2Fh%2A14%28%5Cfrac%7B24%20h%7D%7B1%20day%7D%29%20%7D%7B2000%20kWh%28%5Cfrac%7B3600%20s%7D%7B1%20h%7D%29%20%7D%20%3D%205.6)
c) The coefficient of performance of a reversible heat pump is:
![COP_{reversible}=\frac{T_{h} }{T_{h}-T_{l} }](https://tex.z-dn.net/?f=COP_%7Breversible%7D%3D%5Cfrac%7BT_%7Bh%7D%20%7D%7BT_%7Bh%7D-T_%7Bl%7D%20%20%7D)
Th=20+273=293 K
Tl=10+273=283K
Replacing:
![COP_{reversible}=\frac{293}{293-283}=29.3](https://tex.z-dn.net/?f=COP_%7Breversible%7D%3D%5Cfrac%7B293%7D%7B293-283%7D%3D29.3)
Water can freeze in cold weather and cause brake failure.