So the backbone of DNA is made up of 6 smaller molecules. Also a 5 carbon sugar called deoxyribose, <span>a phosphate molecule and four different nitrogenous base which are: adenine, thymine, cytosine, and guanine. The rails are made up of alternating sugars and phosphate molecules.
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Answer:
The proximal convoluted tubule.
Explanation:
What are the other answer choices to choose from?
c. is yolk sac