Question

a biologist collects dna samples from two sisters. the younger sister has blond hair. the older sister has red hair. the sisters have different traits because their dna contains different-
types of sugar molecules
sized phosphate groups
orders of nucleotides
arrangement of sugars and phosphates
question 3
four different nucleotides are used as building blocks of dna. which of the following can be used to distinguish one nucleotide from another?
the length of the phosphate group
the nitrogenous base
the shape of the deoxyribose sugar
the type of fatty acid

Explanation:

For the first question:
DNA is made up of nucleotides. The order of nucleotides (the sequence of nitrogenous bases) in DNA determines the genetic information, which in turn leads to different traits. Sugar molecules (deoxyribose) and phosphate groups are the same in all DNA nucleotides. The arrangement of sugars and phosphates forms the backbone of DNA and is consistent.

For the second question:
Nucleotides in DNA are composed of a deoxyribose sugar, a phosphate group, and a nitrogenous base. The deoxyribose sugar has the same shape for all DNA nucleotides. The phosphate group does not vary in a way that distinguishes nucleotides. Fatty acids are not part of nucleotides. The nitrogenous base (adenine, thymine, cytosine, guanine) is what distinguishes one nucleotide from another.

Answer:

First question: C. Orders of nucleotides
Second question: The nitrogenous base.