Question

question 4
______ reactions occur as nucleotides are linked together to form dna.
exchange
decomposition
synthesis
question 5
alpha - helices and beta - sheets are examples of the ______ structure of protein.
primary
quaternary
secondary
tertiary

Explanation:

For Question 4, synthesis reactions build larger molecules from smaller ones, and nucleotides link to form DNA through such reactions. For Question 5, alpha - helices and beta - sheets are characteristic of the secondary structure of proteins, which is formed by local folding of the polypeptide chain.

Answer:

Question 4: C. Synthesis
Question 5: C. Secondary