Chapter 13 DNA

Two scientists that discovered the shape of the DNA molecule were

• Mendel and Chargaff

• Watson and Crick

• Griffith and Franklin

• Turner and Hooch

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%

Match the letter to the part.

a

b

c

d

e

Covalent Bond

Hydrogen Bonds

Phosphate

Deoxyribose Sugar

Nitrogen Base

Tags

112.42.c.7.A

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

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

The principal enzyme responsible for DNA replication is

• primase

• DNA polymerase

• RNA polymerase

• helicase

During DNA replication, a template of DNA that has the bases GCATTC will produce a new complimentary strand of DNA with the base sequence of

• CGTAAG

• GCATTC

• CGTTTC

• GCAAAG