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

What components (two things) 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 go together in different ways to help create unique or different individuals. Where is the genetic code mostly 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 tested how life might have started on early Earth. They used a closed system with flasks and tubes to simulate Earth’s early atmosphere, which had no oxygen. They mixed water vapor with gases and added electric sparks to mimic lightning. After letting it cool, they found small amounts of amino acids—the building blocks of life.

Which is a significant finding of this experiment regarding the origin (beginning) 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?