Question

1. describe the structure and shape of dna. the bases attach to t bases, and c bases always attach to g bases.
2. what are the rails of the ladder made of? a. sugars b. phosphates
3. how are the rails of the ladder kept together? the bases from the rails bond to the bases from the other rail to form rungs. the bases from one side of the ladder attach to the bases hanging from the other rail. this keeps the ladder together. the bases attach to one another in a very specific way: a bases always
4. what are the four different dna bases? a. b. c. d.
5. what part of the ladder do these bases form?
6. a always pairs with what base?

Explanation:

1. DNA has a double - helix structure like a twisted ladder. The rails are made of alternating sugar (deoxyribose) and phosphate, and the rungs are made of bases (A, T, C, G). Bases pair specifically: A with T, C with G.
2. The rails of the DNA ladder are made of alternating sugar (deoxyribose) and phosphate.
3. The bases in DNA are held together by hydrogen bonds.
4. The four different DNA bases are adenine (A), thymine (T), cytosine (C), and guanine (G).
5. The bases form the rungs of the DNA ladder.
6. 'A' (adenine) always pairs with 'T' (thymine).

Answer:

1. DNA has a double - helix structure with rails of alternating sugar - phosphate and rungs of paired bases.
2. Alternating sugar (deoxyribose) and phosphate.
3. Hydrogen bonds.
4. Adenine (A), Thymine (T), Cytosine (C), Guanine (G).
5. The rungs.
6. Thymine (T).