From 92c0765d277958b338bbe8f05c3d9dcc47a5de6c Mon Sep 17 00:00:00 2001 From: James Su Date: Fri, 25 Oct 2019 18:16:03 +0000 Subject: [PATCH] Update Unit 2: Biology.md --- Grade 10/Science/SNC2DZ/Unit 2: Biology.md | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/Grade 10/Science/SNC2DZ/Unit 2: Biology.md b/Grade 10/Science/SNC2DZ/Unit 2: Biology.md index ed3e075..aab106c 100644 --- a/Grade 10/Science/SNC2DZ/Unit 2: Biology.md +++ b/Grade 10/Science/SNC2DZ/Unit 2: Biology.md @@ -50,12 +50,14 @@ A person contains roughly 100 trillion cells - Holds deoxyribonucleic acid (DNA) in form of chromatin - DNA is a double helix that make genes - Genes are a complete set of instructions to make a complete product (typically proteins) + - `Genes`: one of the many sets of instructions, in your DNA, found on a **chromosome**, for making a functional product (mostly proteins) - Chromatin is DNA wrapped tightly in protein - Chromosomes are even more tightly wrapped chromatin used in cell division only - Surrounded by a double membrane - Substances enter and exit the nucleus via nuclear pores - Messenger RNA (mRNA) is encoded from DNA and sent to ribosomes to produce proteins + ### Nucleolus - Dense region of DNA located in the nucleus - This area of DNA is specially for ribosomal DNA (rDNA), or DNA used to make ribosomes @@ -66,4 +68,17 @@ A person contains roughly 100 trillion cells ### Cytoplasm & Cytosol - Cytosol is the fluid cells contain - All organelles are suspended in cytosol - - Cytoplasm is the cytosol along with everything in a cell, excluding the nucleus \ No newline at end of file + - Cytoplasm is the cytosol along with everything in a cell, excluding the nucleus + +## Rough Endoplasmic reticulum +The endoplasmic reticulum is a network of tubules and flattened sacs with a "rough" appearance because of the presence of ribosomes on the surface + +### Function +- Protein synthesis + - About half of the cell's proteins are made here, by the ribosomes +- Protein movement + - Proteins are transported by vesicles throught the cell to other organelles, like the golgi apparatus +- Protein "Proof-Reading" + - pre-existing proteins are center the rough-ER for modification + +