Question

part a
in a dna molecule, the phosphate serves ______.
as nucleotides
as a code
to hold the molecular backbone together
to bind the sugars to their bases
45.
part a
which of the following does not describe uses for the atp molecule?
chemical work
mechanical work
transport down their concentration gradient
pigment structure
46.
part a
how many phosphates would adp have attached to it?
one
two
none
three

Explanation:

• For the first question, in a DNA molecule, phosphate - sugar backbones are formed by the linkage of phosphate groups between the 3' - carbon of one sugar and the 5' - carbon of the next sugar, holding the molecular backbone together.
• For the second question, ATP is used for chemical work (e.g., in biosynthesis), mechanical work (e.g., muscle contraction), and transport against concentration gradients. It is not related to pigment structure.
• For the third question, ADP (adenosine diphosphate) has two phosphate groups attached to adenosine.

Answer:

• In a DNA molecule, the phosphate serves to hold the molecular backbone together.
• Which of the following does NOT describe uses for the ATP molecule? Pigment structure.
• How many phosphates would ADP have attached to it? Two.