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2 years ago

What are the similarities and differences between nerves and hormones

Biology

1 answer:

Ira Lisetskai [31]2 years ago

3 0

Answer:

the nervous system uses electrical impulses to send signals through neurons, whereas the hormonal system uses chemical messengers transported into blood plasma to target cells.

Explanation:

Hope this helps.

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Accuracy in the translation of mRNA into the sequence of amino acids in a polypeptide depends on specificity in which of the fol

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The answer would be the first one: Binding of ribosomes to mRNA.

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3 years ago

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3. What is biomass?_

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the total mass of organisms in a given area or volume.

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If you knew a particular amino acid sequence would you figure out the dna for that sequence

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3 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 = $K_a=1.8\times 10^{-4}$

Concentration of HA= 0.5 mM

Concentration of $A^-$ = 0.1 mM

pH = 6.16

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:

$6.16=pK_a+\log (\frac{[0.1]}{0.5})$

$pK_a=6.86$

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

Using Henderson Hesselbach equation :

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

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

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

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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2 years ago

A peer group is a _______ group composed of equal age individuals with similar characteristics.

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D. secondary

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Secondary groups:
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2. Classmates
3. Friends
<span>4. Acquaintance</span>

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3 years ago

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