Biology SL

Chapters

553

Notes

Theme A - Unity & Diversity

Theme B - Form & Function

Theme C - Interaction & Interdependence

Theme D - Continuity & Change

Biology SL

Theme A - Unity & Diversity

Unlocking DNA The Power Of Base Pairing

490 words

3 mins read

Last edited on 5th Nov 2024

What's the Deal? In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). This love affair is known as complementary base pairing.
Real-World Example: Think of complementary base pairing like best friends who always wear matching outfits. A always matches with T, and C with G. Perfect harmony!

How it Happens: Imagine unzipping a zipper - the two strands of DNA's double helix separate, then serve as guides or templates for new strands.
Nitty-Gritty Details: New strands are formed by adding nucleotides one by one, like building a LEGO tower. They must carry the base that matches the next base on the template strand.
Semi-Conservative Replication: It's like a DNA photocopying process! You get two DNA molecules, each with an original strand and a new strand.
Real-World Example: Think of it as baking a cake using a recipe. You keep the original recipe and create a new cake (or DNA strand) that's exactly the same!

What's a Gene? Genes are like recipes in the cookbook of life, containing info for specific functions.
Express Yourself: When a gene affects a cell, it's called gene expression, like sharing your favorite recipe with friends.
Transcription: This process copies the gene's base sequence but with RNA. A pairs with uracil (U) instead of T. It's like translating a recipe into a different language!
Real-World Example: Imagine transcription like taking a photo of your favorite recipe and texting it to a friend. You're sharing the same info, but in a different format (RNA instead of DNA).

Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟

Biology SL

490 words

3 mins read

Last edited on 5th Nov 2024

What's the Deal? In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). This love affair is known as complementary base pairing.
Real-World Example: Think of complementary base pairing like best friends who always wear matching outfits. A always matches with T, and C with G. Perfect harmony!

How it Happens: Imagine unzipping a zipper - the two strands of DNA's double helix separate, then serve as guides or templates for new strands.
Nitty-Gritty Details: New strands are formed by adding nucleotides one by one, like building a LEGO tower. They must carry the base that matches the next base on the template strand.
Semi-Conservative Replication: It's like a DNA photocopying process! You get two DNA molecules, each with an original strand and a new strand.
Real-World Example: Think of it as baking a cake using a recipe. You keep the original recipe and create a new cake (or DNA strand) that's exactly the same!

What's a Gene? Genes are like recipes in the cookbook of life, containing info for specific functions.
Express Yourself: When a gene affects a cell, it's called gene expression, like sharing your favorite recipe with friends.
Transcription: This process copies the gene's base sequence but with RNA. A pairs with uracil (U) instead of T. It's like translating a recipe into a different language!
Real-World Example: Imagine transcription like taking a photo of your favorite recipe and texting it to a friend. You're sharing the same info, but in a different format (RNA instead of DNA).

Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟