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r-ruslan [8.4K]
3 years ago
11

Why are dichotomous keys used?

Biology
1 answer:
Olenka [21]3 years ago
4 0

Dichotomous keys are used cause it allows the user to determine the identity of items and organisms in the natural world

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How did the Rf values differ between pigments and solvents?
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Answer:

The Rf values indicate how soluble the particular pigment is in the solvent by how high the pigment moves on the paper.

Explanation:

The Rf values indicate how soluble the particular pigment is in the solvent by how high the pigment moves on the paper. Small Rf values tend to indicate larger, less soluble pigments while the highly soluble pigments have an Rf value near to one.

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Grace [21]

TCTCG and AGAGC are the perfect pair.

Option A

<h3><u>Explanation:</u></h3>

DNA is the genetic molecule of a living cell. The DNA stores genetic information of the species inside itself by means of particular pattern or sequence of nitrogen bases called as gene. The gene is comprised of the particular sequence of nitrogenous bases which are four in number - adenine, guanine, thymine and cytosine.

The nitrogen bases are present in both the strands of DNA and they have complementary relationship between them. The adenine forms hydrogen bonds with thymine and guanine pairs with cytosine.

Here the sequence of one strand is given as TCTCG. So according to the complementary pairing process, the opposite strand must have the sequence of AGAGC to maintain the structure.

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How many times more acidic is a pH of 2 than a pH of 4?
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