The DNA (deoxyribonucleic acid) is the double helical in structure. It has two anti parallel strands of long polynucleotides. The nucleotides are two purines ( adenine and guanine) and two pyrimidines ( thymine and cytosine). These purines and pyrimidines are attached with their complementary. Adenine pairs with the thymine with the two hydrogen bonds and the guanine pair with cytosine by three hydrogen bonds. The two strands are twisted which is responsible for the helical structure. The overall charge on the DNA molecule is the negative charge.
Answer:
hmm, I'm struggling here.
Explanation:
The purpose of saliva serves in digestion is to breaks down complex carbohydrates. The correct option is (A).
<h3>What is saliva?</h3>
Saliva is a transparent liquid secreted by glands present in the mouth. Saliva is an important secretion for the digestion of food in the mouth.
It is made up of water and many digestive enzymes are present in the saliva, which help in digestion of complex carbohydrate like starch.
Thus, the correct option is A) breaks down complex carbohydrates.
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Blood cells take up water, enlarge finally they’re going to burst.
