Copy of DNA Origin, Structure & Replication Quiz 25-26 (5/2/2026)

What components make up the backbone of the DNA molecule?

What components make up a nucleotide of DNA?

Select THREE correct answers.

Humans have thousands of genes that combine in different ways to help create unique individuals. Where is the genetic code primarily located?

Immunoglobulin G (IgG) is a protein secreted by white blood cells in response to specific antigens. What factor most directly determines the amino acids that are combined to create IgG?

A segment of DNA is shown in the diagram.

Which of these identifies the part of the DNA segment labeled X?

A segment of a DNA strand is shown.

3' A G G T C A G G T 5'

Which of these is the correct complementary DNA strand for the segment shown?

A student was listing the steps of DNA replication. Her ideas are listed below, but they are out of order.

I. During S phase, the DNA double helix is unwound by an enzyme

II. Two identical strands of DNA are formed

III. During S phase, an enzyme adds complementary nucleotides to each strand of DNA

IV. The cell enters S phase with one set of DNA

What is the correct order for the steps of DNA replication?

The Miller and Urey experiment simulated conditions thought to be present on early Earth to test the origin of life. Using a closed system of flasks and tubes, water vapor was mixed with a variety of different gases to simulate an atmosphere that did not contain oxygen. The mixture was then exposed to an electrical discharge and allowed to cool. After a period of time, the mixture was analyzed and found to contain trace amino acids. The Miller and Urey experiment is shown.

Which is a significant finding of this experiment regarding the origin of life on Earth?

Specific nitrogen bases will always pair together when a DNA molecule is formed. Because of this, which of the following will always be true of a DNA molecule?

Which of the following diagrams best represents DNA replication?