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2 years ago

14

A _ is a segment of DNA that directs the development of some inherited traits and it has different forms called ____

_.
A. allele; genes

B. cell; nucleus

C. gene ; alleles

1 answer:

wel2 years ago

4 0

C........................................................................

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Answer:

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Crossing over is a very important event in prophase 1 of meiosis! What happens during crossing over and what is the significance

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2 years ago

A certain buffer is made by mixing a weak acid HA and its conjugate base A–. When HA is present at a concentration of 0.5 mM and

MAVERICK [17]

Answer:The ratio of the concentrations of $HA$ and $A^-$ when the buffer has a pH of 7.02 is 0.69

Explanation:

The dissociation constant for formic acid = $K_a=1.8\times 10^{-4}$

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First we have to calculate the value of $K_a$ .

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[A^-}{[HA]}$

Now put all the given values in this expression, we get:

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To calculate the ratio of the concentrations of $HA$ and $A^-$ when the buffer has a pH of 7.02.

Using Henderson Hesselbach equation :

$7.02=6.86+\log \frac{[A^-]}{[HA]}$

$7.02=6.86+\log \frac{[A^-]}{[HA]}$

$\frac{[A^-]}{[HA]}=1.44$

$\frac{[HA]}{[A^-]}=0.69$

Thus the ratio of the concentrations of $HA$ and $A^-$ when the buffer has a pH of 7.02 is 0.69

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