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An extract of DNA contains 4000 base pairs. The extract is identified to contain 300 guanine bases. How many adenine bases can be found in the DNA extract?.

3700
KS
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Explain how the physical properties of water enable organisms to survive over a range of temperatures.

Water has a very high specific heat capacity due to the collective forces of the many hydrogen bonds. A lot of energy goes into breaking these bonds rather than raising the temperature of the water, hence pr...
AB
Answered by Arunima B. • Biology tutor
24152 Views

What are the 2 methods used to manufacture ethanol? What are the advantages and disadvantages of both?

The hydration of ethene: Ethene and steam are passed over a catalyst - concentrated phosphoric acid (H 3 PO 4 ) - at 300 O C and 60-70 atmospheres. This process is fast, continuous and gives a pure product b...
JP
Answered by James P. • Chemistry tutor
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How is the the small intestine adapted for absorption?

The Ileum is long (up to 7m!) and has a very high surface area due to the presence of many villi and microvilli . A single villus is made up of many cells, each with lots of microvilli, and have many blood v...
JP
Answered by James P. • Biology tutor
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A stationary point of inflection implies a second derivative of 0, does this work the other way around?

No, and we may take a counterexample to see why. If y=x^5+5/3x^4, dy/dx=5x^4+20/3x^3, d2y/dx2=20x^3+20x*2=20x^2(x+1). Setting this to 0 will give us the candidates for a POI, but not all these numbers will b...
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Answered by Toby R. • Maths tutor
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