Helicase molecules is active first in DNA replication. DNA helicase are enzymes capable of unwinding duplex DNA to provide the single- stranded DNA templates that are required in processes such as replication and recombination.all helicase separates the strands double mix helix using energy derived from hydrolysis nucleotide.
Uracil is readily produced by the chemical degradation of cytosine so have thymine as the normal base makes detection and repair of appearing mutations more efficient
<u>Answer</u>:
<em>Sodium potassium pump works by following several steps.
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<u>Explanation</u>:
<em>1. Carrier protein binds three molecules of Na+
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<em>2. ATP is split, phosphate bonds to carrier.
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<em>3. Carrier protein changes shape, and deposits Na on the outside of the cell.
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<em>4. Carrier binds two molecules of K
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<em>5. Phosphate is released.
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<em>6. Potassium is released inside the cell
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Sodium -potassium pump is essential to maintain the concentration of sodium and potassium outside and inside the cell respectively.
It is the function of sodium potassium pump to transport sodium out of the cell and potassium inside of the cell against a concentration gradient.
<em>Thus it is an active transport mechanism.
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The arteries take deoxygenated blood back to the heart.