# Teach with this site

> Free, curriculum-linked ideas for every concept in Biology made simple: goals, a discussion question and an exit ticket.

Source: https://khushisingh.in/impact/teach/
Author: Khushi Singh (khushisingh.in). Licence: CC BY 4.0 for text and original illustrations, unless a credit says otherwise.
Evidence labels used on this site: established, strong evidence, emerging, hypothesis, debated. Where a page has Simple, Curious and Expert versions, all three follow.

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Impact · For teachers

Free, curriculum-linked ideas for every concept in Biology made simple: goals, a discussion question and an exit ticket. Everything is CC BY 4.0, so print and adapt freely.

Curriculum links name broad school topics (as in NCERT/CBSE science and biology). Please check them against your current syllabus, as chapters have been revised in recent years.

Concept 1

## [DNA, RNA, protein](https://khushisingh.in/explore/01-dna-rna-protein/)

**Links to:** Molecular basis of inheritance

**Learning goals:**

- Describe the flow of information DNA → RNA → protein
- Explain base pairing (A–T, G–C)

**Discuss:** If every cell has the same DNA, how do cells become different?

**Exit ticket:** Write the partner strand for ATGC, then its RNA copy.

Concept 2

## [Switching genes on: transcription factors](https://khushisingh.in/explore/02-switching-genes-on/)

**Links to:** Molecular basis of inheritance; regulation of gene expression

**Learning goals:**

- Explain how transcription factors switch genes on and off
- Relate cell types to the genes they use

**Discuss:** Why does a muscle cell not make the proteins of a nerve cell?

**Exit ticket:** What is an enhancer?

Concept 3

## [Chromatin: how DNA is packed and marked](https://khushisingh.in/explore/03-chromatin/)

**Links to:** Molecular basis of inheritance; heredity and variation

**Learning goals:**

- Describe how DNA is packed around histones
- Explain that tags on histones change gene activity (epigenetics)

**Discuss:** How does 2 m of DNA fit in a cell?

**Exit ticket:** What does “epi” in epigenetics mean?

Concept 4

## [The life of an mRNA](https://khushisingh.in/explore/04-the-life-of-an-mrna/)

**Links to:** Molecular basis of inheritance

**Learning goals:**

- Describe splicing, transport and decay of mRNA
- Explain why the place a protein is made can matter

**Discuss:** Why would a cell send an mRNA to one end?

**Exit ticket:** Name two things that happen to an mRNA after it is made.

Concept 5

## [Making proteins: translation](https://khushisingh.in/explore/05-making-proteins/)

**Links to:** Molecular basis of inheritance; biomolecules

**Learning goals:**

- Use the genetic code to read a short mRNA
- Explain that a protein’s shape decides its job

**Discuss:** How can four letters spell 20 amino acids?

**Exit ticket:** Translate AUG GCU UUC with a codon table.

Concept 6

## [Droplets inside cells](https://khushisingh.in/explore/06-droplets-inside-cells/)

**Links to:** Cell: structure and functions

**Learning goals:**

- Describe phase separation with oil and vinegar
- Contrast liquid droplets with solid clumps

**Discuss:** How can a cell make a compartment without a wall?

**Exit ticket:** Name one droplet found inside cells.

Concept 7

## [Food for genes: metabolism and histone marks](https://khushisingh.in/explore/07-food-for-genes/)

**Links to:** Respiration in organisms; biomolecules

**Learning goals:**

- Explain glycolysis and lactate as a fuel
- Relate metabolism to histone tags

**Discuss:** Can what we eat change how our genes are used?

**Exit ticket:** Which molecule supplies the acetyl tag?

Concept 8

## [The embryo’s first genes](https://khushisingh.in/explore/08-the-embryos-first-genes/)

**Links to:** Development; reproduction in animals

**Learning goals:**

- Explain the maternal-to-zygotic transition
- Read a line chart of real data

**Discuss:** When does an embryo start using its own genes?

**Exit ticket:** Which genes peak at 2–4 hours in the chart?

Each concept page has a labelled picture and a short animation you can pause on a classroom screen: [Biology made simple](https://khushisingh.in/explore/).