11.2 Test

A nucleotide of DNA may contain adenine, guanine, cytosine, or thymine. What is each of these components?

• 5-carbon sugar
• nitrogenous base
• phosphate group
• nucleic acid

The image shows a nucleotide, a building block of the DNA molecule From left to right, what are the names of the components?

• 5-carbon sugar, nitrogenous base, phosphate group
• nucleic acid, 5-carbon sugar, amino group
• 5-carbon sugar, nitrogenous base, carboxyl group
• nitrogenous base, 5-carbon sugar, phosphate group

DNA is made up of ___________________, joined by covalent bonds between the (adenine / guanine / thymine/ deoxyribose) of one monomer and the (phosphate group / nitrogenous base) of the next monomer

• nucleotides
• nitrogenous bases

DNA is made up of (nucleotides / nitrogenous bases), joined by covalent bonds between the ________________ of one monomer and the (phosphate group / nitrogenous base) of the next monomer

• adenine
• guanine
• thymine
• deoxyribose

DNA is made up of (nucleotides / nitrogenous bases), joined by covalent bonds between the (adenine / guanine / thymine/ deoxyribose) of one monomer and the _________________ of the next monomer

• phosphate group
• nitrogenous base

Analyze the data about nitrogenous base content of DNA from various species Which three statements are supported by the data?

• In any one species, the amount of adenine closely approximates that of thymine.
• In any one species, the amount of guanine closely approximates that of cytosine.
• The amount of A, T, G, and C in DNA is constant among species.
• The amount of A, T, G, and C in DNA varies among species.

Rosalind Franklin’s photographs of the X-ray diffraction pattern of DNA provided important clues about the structure of the DNA molecule. What was revealed by the photograph that enabled Watson and Crick to build their model of the DNA molecule? Select all that apply

• The nitrogenous bases form the backbone on the outside of each DNA strand.
• The DNA strands are twisted around each other.
• There are two strands in the DNA molecule.
• The nitrogenous bases are near the center of the DNA molecule.

The diagram shows a section of double-stranded DNA, and includes the bonds that hold the two strands together. Chemical bonds are represented by dotted lines (label 1) and solid lines (label 2). What types of bonds are represented by the dotted lines and the solid lines in the diagram?

• The dotted lines represent hydrogen bonds; the solid lines represent ionic bonds.
• The dotted lines represent covalent bonds; the solid lines represent hydrogen bonds.
• The dotted lines represent ionic bonds; the solid lines represent covalent bonds.
• The dotted lines represent hydrogen bonds; the solid lines represent covalent bonds.

1. What are the three components that make up each DNA nucleotide?

• Sugar, protein, and phosphate
• Deoxyribose, phosphate, and nitrogenous base
• Ribose, protein, and base
• Carbon, hydrogen, and oxygen

4. What is the basic shape of the DNA double helix compared to in the text?

• A spiral staircase
• A twisted ladder
• A coiled spring
• A braided rope