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aleksley [76]
3 years ago
15

Shannon is making a Venn diagram to organize the characteristics of cell walls and cell membranes. Which pair of characteristics

both belong in the two areas of the Venn diagram that do not intersect?
A-helps with communication; contains mostly cellulose
B-contains mostly cellulose; forms the outer layer of animal cells
C-is found in plant cells; is found in animal cells
D-is semipermeable; found in animal cells
Biology
2 answers:
masya89 [10]3 years ago
5 0

The correct answer is option B-contains mostly cellulose; forms the outer layer of animal cells.

The cellulose is the component, which make up the cell wall of the plant cells. the cell wall is absent in the case of the animal cells. Other than plants, some fungus also have cell wall, but the cell wall made up of cellulose is an unique feature of the plant cells. The cell wall is absent in the animal cell, so, cellulose would not be find in animal cell but it would be present in plant cell.

Lunna [17]3 years ago
3 0

Answer:

the correct answer is B

Explanation:

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If a molecule of DNA has 30% Adenine how much of the other bases will be present?
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Answer:

If a DNA molecule has 30% Adenine the percentage of the other bases is Thymine: 30% Cytosine: 20% Guanine: 20%.

Explanation:

When the percentage that a base has in a DNA molecule is given, the percentage of the other bases can be known using the Chargaff's base pair rule.

A DNA molecule has the information of the genome of a living being, according to a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine.

Chargaff was able to establish that in a DNA molecule the ratio of purine : pyrimidine of 1:1, so there must be the same amount of thymine as adenine and a similar amount of guanine for the cytosine, taking into account the complementarity of bases.

Taking into account the law of the base pair, if in a DNA chain there is 30% of Adenine, in the molecule there is:

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  • <em>Cytosine 20%. </em>
  • <em>Guanine 20%. </em>
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In this case, the <u>Chargaff rule is useful to determine the percentage of nitrogenous bases that exist in a DNA molecule, knowing the percentage of a single base</u>.

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