BIO DOL Components of DNA

What components make up the backbone of a DNA molecule?

• Purines and deoxyribose

• Pyrimidines and purines

• Deoxyribose and phosphate group

• Phosphate group and pyrimidines

Characteristics such as a widow's peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?

• Phosphate groups

• Nitrogenous bases

• Deoxyribose sugars

• Hydrogen bonds

A segment of DNA is shown in the diagram. Which of these identifies the part of the DNA segment labeled X?

• Nucleotide

• Phosphate group

• Hydrogen bond

• Deoxyribose

Which part of the DNA molecule is responsible for the direct coding of specific traits in an organism?

• The number of hydrogen bonds that hold the strands of DNA together?

• The number of carbons in the DNA molecule

• The sequence of nucleotide bases in the DNA molecule.

• The sequences of phosphates along each DNA strand.

How is information for specifying the traits of organisms carried in the DNA?