Lesson 12 Unit Test

During replication, which sequence of nucleotides would bond with the DNA sequence TATGA?

• TATGA

• ATACT

• CACTA

• AGTAT

The scientist(s) responsible for the discovery of bacterial transformation is (are)

• Watson and Crick

• Avery

• Griffith

• Franklin

Which of the following does NOT describe the structure of DNA?

• double helix

• nucleotide polymer

• contains adenine-guanine pairs

• sugar-phosphate backbone

What did Hershey and Chase's work show?

• Genes are probably made of DNA

• Genes are probably made of protein

• Viruses contain DNA but not protein

• Bacteria contain DNA but not protein

The two "backbones" of the DNA molecule consist of

• adenines and sugar.

• phosphates and sugars.

• adenines and thymines.

• thymines and sugar.

In eukaryotic chromosomes, DNA is tightly coiled around proteins called

• DNA polymerase.

• chromatin.

• histones.

• nucleotides.

When prokaryotic cells copy their DNA, replication begins at

• one point on the DNA molecule.

• two points on opposite ends of the DNA molecule.

• dozens to hundreds of points along the molecule.

• opposite ends of the molecule.

Compared to eukaryotic cells, prokaryotic cells contain

• about 1000 times more DNA.

• about one thousandth as much DNA.

• twice as much DNA.

• the same amount of DNA.

Under ideal conditions, a single bacterial cell can reproduce every 20 minutes. The graph shows how the total number of cells under ideal conditions can change over time. How many cells are present after 80 minutes?

• 1

• 2

• 16

• 32

Under ideal conditions, a single bacterial cell can reproduce every 20 minutes. The graph shows how the total number of cells under ideal conditions can change over time. If the DNA of this bacterium is 4 million base pairs in length, how many total molecules of A, T, C, and G are required for replication to be successful?

• 2 million

• 4 million

• 8 million

• 32 million