Differentiate between light and electron microscopy.

1 answer:

7 0

<span>Light microscopy is great for small labs and general use, as the microscope is lightweight, usually portable, and relatively inexpensive.</span>

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gayaneshka [121]

Answer:

Apart from poisoning the fish, this toxic fishing activity kills animals that are essential to the aquatic environment, such as corals, and provide food and shelter for a number of marine species. One square meter of coral reef is lost with every fish captured using this method. Also, overfishing has the potential to deplete main reef habitats and damage coral habitat. In many places, rapid human population growth, increased demand, the use of more advanced fishery technology, and insufficient maintenance and regulation have resulted in the extinction of key coral species and habitat damage.

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I would say C.
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The PCR (polymerase chain reaction) protocol that is currently used in laboratories was facilitated by the discovery of a bacter

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Answer and Explanation:

a. Why would such a heat-stable polymerase be beneficial in PCR?

- Because in PCR, DNA is heated up 95 °C to denature DNA (see first figure)

b. What would happen if it weren’t heat stable?

- If it weren't heat stable we had to add it in every PCR cycle and please note that PCR can take 20 to 35 cycles. Imagine being researcher that you need to open 20 small tubes every 5 minutes and add polymerase enzyme into these tubes for 20 to 35 times. It is very labor intensive and Taq polymerase relives the researchers from this work.

c. How might you choose a region of DNA for a PCR primer so as to increase the temperature necessary for primer annealing (to minimize nonspecific PCR products)?

- You need to calculate melting temperature (Tm) of your primers and use the calculated values to prevent non specific bindings. Primers usually binds non-specifically if the low annealing temperature is used (lower than 5 °C of your Tm value)

d. A PCR reaction begins with 5 double stranded segment of DNA. Estimate the number of double-stranded copies of DNA that are present after the completion of 15 amplification cycles?

In every amplification cycle copies of DNA are doubled. So the answer is 5 x 2^15.

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