Question

question 14 (1 point)
what type of bond holds together the two sides of a dna molecule?
hydrogen
covalent
ionic
question 15 (1 point)
an anti - codon is composed of how many nitrogenous bases?
3
4
1
2

Explanation:

• For Question 14: DNA has a double - helix structure. The two strands of DNA are held together by hydrogen bonds between the complementary nitrogenous bases (adenine - thymine and cytosine - guanine). Covalent bonds are within the sugar - phosphate backbone of each DNA strand, and ionic bonds are not the type of bonds that hold the two strands of DNA together.
• For Question 15: An anticodon is a sequence on tRNA (transfer RNA) that pairs with a codon on mRNA (messenger RNA). A codon is composed of 3 nitrogenous bases, and the anticodon, which is complementary to the codon, is also composed of 3 nitrogenous bases.

Answer:

Question 14: hydrogen
Question 15: 3