Chapter 13 - DNA Test

Two scientists that discovered the shape of the DNA molecule were

• Mendel and Chargaff
• Watson and Crick
• Griffith and Franklin
• Turner and Hooch

According to Chargaff's rule:

• adenine = cytosine
• guanine = cytosine
• thymine = guanine
• cytosine = thymine

Which scientist made X-ray diffraction photos of DNA?

• Chargaff
• Watson
• Franklin
• Mendel

A DNA molecule is ______________ stranded and is made of many smaller units called _____________.

• double; nucleotides
• single; nucleic acids
• triple; nucleic acids
• single; nucleotides

The "backbone" of the DNA molecule "ladder" are composed of

• nitrogenous base pairs
• adenine and nitrogen bases
• deoxyribose and adenines
• phosphate groups and deoxyribose

Based on Chargaff's rule, if the percentage of adenine found in a DNA molecule is 15%. What would the percentage of thymine in that DNA molecule be?

• 15%
• 25%
• 35%
• 85%

Two strands of DNA are held together by

• covalent bonds
• ionic bonds
• electric bonds
• hydrogen bonds

The "rungs" or "steps" of the DNA ladder are made up of

• phosphates groups
• deoxyribose
• nitrogenous bases pairs
• homogenous base pairs

During which phase of the cell cycle will DNA replicate?

• interphase
• prophase
• anaphase
• telophase

Watson and Crick discovered that the two strands of DNA are

• run in the same direction
• run in opposite directions
• run in circles
• run in place