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What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?

  • The larger the fragment size, the farther it moves

  • The smaller the fragment size, the farther it moves

  • Positively charged fragments move to farther end

  • Positively charged fragments move to farther end


B.

The smaller the fragment size, the farther it moves

During gel electrophoresis, DNA fragments separate (resolve) according to their size through sieving effect provided by agarose gel.

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During DNA replication, Okazaki fragments are used to elongate

  • The leading strand towards replication fork

  • The lagging strand towards replication fork

  • The leading strand away from replication fork

  • The leading strand away from replication fork


Lysozyme that is present in perspiration, saliva and tears, destroys

  • certain fungi

  • certain types of bacteria

  • all viruses

  • all viruses


Restriction endonuclease

  • cuts the DNA molecule randomly

  • cuts the DNA molecule at specific sites

  • restricts the synthesis of DNA inside the nucleus

  • restricts the synthesis of DNA inside the nucleus


A gene whose expression helps to identify transformed cell is known as

  • Selectable marker

  • Vector

  • Plasmid

  • Plasmid


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