Answer:
The answer is double helix.
Explanation:
In its natural state, each DNA molecule is actually composed of two single strands held together along their length with hydrogen bonds between the bases. Watson and Crick proposed that the DNA is made up of two strands that are twisted around each other to form a right-handed helix, called a double helix.
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Nitrogen has to be converted or ‘fixed’ to a more usable form through a process called fixation
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C- the heart pumps the blood through the arteries and into the extended vascular system.
Answer:
Add some iodine to a beaker containing the sample. If starch is present, the colour of the solution will turn blue-black.
Explanation: