Synthesis of an Okazaki fragment displaces the RNA primer of the preceding fragment in the form of a “flap.”

the base of the flap is cleaved by the enzyme FEN1 (f lap endonuclease 1).  In this reaction, FEN1 functions as an endonuclease, but it also has a 5’–3’; exonuclease activity. In DNA repair reactions, FEN1 may cleave next to a displaced nucleotide and then use its exonuclease activity to remove adjacent material.

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#Id: 1676

#Unit 4. Cell Communication and Cell Signaling

mRNA vaccine- Moderna covid vaccine

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#Id: 6530

#Unit 7. System Physiology – Animal

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#Id: 3630

#Unit 3. Fundamental Processes

Transfer RNAs base-pair with mRNA codons at a three-base sequence on the tRNA called the anticodon.

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#Id: 1936

#Unit 4. Cell Communication and Cell Signaling

The C5b678 complex can create a small pore, 10 Å in diameter, and formation of this pore can lead to lysis of red blood cells, but not of nucleated cells.

10 to 19 molecules of C9 can be bound and polymerized by a single C5b678 complex. The completed MAC, which has a tubular form and functional pore diameter of 70 Å to 100 Å. 

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#Id: 4910

#Unit 13. Methods in Biology

Variance is always non-negative since each term in the variance sum is squared and therefore the result is either positive or zero.