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lisabon 2012 [21]
3 years ago
8

Which of the following best explains how the characteristics of index fossils are useful to geologists?

Biology
1 answer:
Rzqust [24]3 years ago
7 0

Answer:

the first one

Explanation:

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Fertilizers and pesticides applied to farm fields in Pennsylvania have made their way down into the Chesapeake Bay in Maryland.
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Soil pollution...............
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How can we determine the approximate age of earth?​
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3 years ago
One method for separating polypeptides makes use of their different solubilities. The solubility of large polypeptides in water
bezimeni [28]

Answer:

(a) (Glu)zo or(Phe-Met)3 at pH 7.0

O (Glu)zo ✔

O (Phe-Met)s ❌

(b) (Gly) zo or (Lys-Ala)3 at pH 7.0:

O (Gly12) ❌

O (Lys-Ala)✔

(c) (Ala-Asp-Gly)s or (Asn-Ser-His)s at pH 3.0:

O (Asn-Ser-His)s ✔

O (Ala-Asp-Gly)s ❌

(d) (Ala-Ser-Gly)s or (Asn-Ser-His)s at pH 6.0:

O(Ala-Ser-Gly)s ❌

O (Asn-Ser-Hish)s ✔

Explanation:

Polypeptides that has polar or charged side chains are more soluble than polypeptides with nonpolar side chains.

(a) At ph 7.0

(Glu)20 is negatively charged at pH 7 and more soluble

(Phe-Met)3 is observed to be less polar and less soluble

(b)At ph 7.0

(Lys-Ala)3 is positively charged (polar) and more soluble

(Gly)20 is uncharged as only the amino- and carboxyl-terminal groups are charged as its less polar and less soluble too.

(c) At pH 6.0

(Asn-Ser-His)5 has polar Asn side chains and partially protonated His side chains and it's more soluble unlike the (Ala-Asp-Gly)s at that pH.

(d) At pH 3.0

(Asn-Ser-His)s as partially protonated carboxylate groups of Asp residues and it is also neutral but the imidazole groups of His residues are fully protonated and positively charged. Hence it's more soluble than the (Ala-Ser-Gly)s at that particular pH.

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3 years ago
the forces of volcanic eruptions vary:some eruptions explode violently,and others are slow and quiet. Which type of eruption is
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The pyroclastic material releasing one is called a cinder cone.The slow and quiet is called a shield volcano.
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EXERCISE
USPshnik [31]
5. It is difficult to diagnose genetic conditions because they are rarely seen and once problems start presenting themselves not only would a diagnosis need to be made. But to prove it you would have to take blood from both parents to see why they together could produce genetic conditions.
6) Down syndrome occurs when you get a smaller number of chromosomes you are supposed to inherit from each parent during conception.
7) a silent mutation is a change in DNA but does not changes the encoded and has no phenotypic effect therefore the genetic sequence is not changed
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