Answer:
A nucleotide is made up of one sugar molecule, one phosphate molecule and one of the four bases. Here is the structural formula for the four nucleotides of DNA. Note that the purine bases (adenine and guanine) have a double ring structure while the pyrimidine bases (thymine and cytosine) have only a single ring.
Explanation:
A nucleotide is made up of one sugar molecule, one phosphate molecule and one of the four bases. Here is the structural formula for the four nucleotides of DNA. Note that the purine bases (adenine and guanine) have a double ring structure while the pyrimidine bases (thymine and cytosine) have only a single ring.
The corect answer is: B. Intercalated disks.
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Answer:
1.message or impulse sent through the nervous system
2.body or lymph performes the action.
3.muscle contract
4.message received at muscle fibers
5.brain decides the action.
Answer: germs and toxins and they prevent moisture from escaping the tissues
Explanation: