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kotykmax [81]
4 years ago
5

The letter A indicates: _____. 1. Globules containing eight subunits each. 2. A filamentary structure forms two turns around eac

h globule. 3. Letter A marks the filamentary structure between the globules. 4. Letter B marks one of the globules. 5. Letter C marks one subunit of the globule.
Biology
1 answer:
alex41 [277]4 years ago
6 0
<h2>a DNA double helix</h2>

Explanation:

  • Deoxyribonucleic acid is made up of two chains. A double helical structure is formed when two chains coil around each other.This double helical structure carry genetic information for the growth, reproduction, development and functioning of an organism.
  • The nucleic acid such as DNA and RNA are one of the major types of macromolecules which are necessary for all life forms.
  • The nucleotide is made up of one of four nitrogen containing nucleobases such as Adenine, Guanine, Cytosine and Thymine, Deoxyribose sugar and a Phosphate group.

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Answer:

C

Explanation:

There are two kinds of water, fresh and salt water. Salt water is found in the ocean, which means that any answer with salt water, or the ocean, in it is not a correct source of freshwater. A, B, and D, all include the ocean as their answer, which means that they all include salt water, so C is the only option left. Lakes, rivers, water vapor, and ice sheets are all examples of sources of freshwater. I hope your sister gets a good grade!

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