DNA and Replication — Part 2: Central dogma and replication: visual lesson, ISC Class 12 Biology

Lesson

Central dogma and replication

Part 2 — how genetic information flows and how DNA copies itself.

In this lesson you will

State the central dogma and explain reverse transcription
Explain semi-conservative replication and the roles of DNA polymerase and ligase
Describe the experiments of Meselson and Stahl and of Taylor

Concept

Reverse transcription

In some viruses, such as retroviruses (for example HIV), information flows from RNA to DNA. The enzyme reverse transcriptase makes DNA from the viral RNA, an exception to the original direction of the central dogma.

Check your understanding

Quick check: reverse transcription

Which enzyme copies RNA into DNA?

Question: Multiple choice

Multiple choice1 mark

HIV makes a DNA copy of its RNA genome inside a human cell. Which enzyme carries out this step?

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