CELL DIVISION
THE CELL CYCLE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Deoxyribose sugars bonded to phosphate groups
|
|
|
Hydrogen bonded molecules
|
|
|
2 nitrogenous bases
|
|
|
Nitrogenous bases bonded to sugars
|
Detailed explanation-1: -DNA consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T).
Detailed explanation-2: -The double helix looks like a twisted ladder-the rungs of the ladder are composed of pairs of nitrogenous bases (base pairs), and the sides of the ladder are made up of alternating sugar molecules and phosphate groups.
Detailed explanation-3: -(The Double Helix) The model is called a double helix because two long strands twist around each other like a twisted ladder. The rails of the ladder are made of alternating sugar and phosphate molecules. The steps of the ladder are made of two bases joined together with either two or three weak hydrogen bonds.
Detailed explanation-4: -The sugar-phosphate backbone forms the structural framework of nucleic acids, including DNA and RNA. This backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.
Detailed explanation-5: -The two sides of the DNA ladder are held together loosely by hydrogen bonds.