Скачать с ютуб Eukaryotic Cell Structure & Organelles | A-level Biology | OCR, AQA, Edexcel в хорошем качестве

Eukaryotic Cell Structure & Organelles | A-level Biology | OCR, AQA, Edexcel

Eukaryotic Cell Structure & Organelles in a Snap! Unlock the full A-level Biology course at http://bit.ly/2uKqcV3 created by Adam Tildesley, Biology expert at SnapRevise and graduate of Cambridge University. SnapRevise is the UK’s leading A-level and GCSE revision & exam preparation resource offering comprehensive video courses created by A* Oxbridge tutors. Our courses are designed around the OCR, AQA, SNAB, Edexcel B, WJEC, CIE and IAL exam boards, concisely covering all the important concepts required by each specification. In addition to all the content videos, our courses include hundreds of exam question videos, where we show you how to tackle questions and walk you through step by step how to score full marks. Sign up today and together, let’s make A-level Biology a walk in the park! The key points covered of this video include: 1. Cell Organelles 2. The Nucleus 3. Inside the Nucleus 4. The Ribosomes Cell Organelles Eukaryotic cells include plant, animal, and fungal cells. This means they are distinct from prokaryotic cells. Eukaryotic cells have some membrane-bound organelles. Organelles are components of cells with specific functions. Eukaryotic cells have a range of different organelles The Nucleus The largest organelle in the cell is the nucleus. It is roughly spherical - sometimes containing a dark patch. The nucleus contains the DNA of the cell, which contains the information for producing protein. The DNA is packed with proteins called histone proteins - together they are called chromatin. It is surrounded by a double membrane called the nuclear envelope. The nuclear envelope is made out of an inner and outer membrane which separate the nucleus from the rest of the cell. Nuclear pores are holes in the nuclear envelope, mRNA and ribosomes can travel through nuclear pores. Inside the Nucleus Inside the nucleus, there is a nucleolus which contains densely packed DNA and protein. The nucleolus is involved in making ribosomes. The rest of the nucleus also contains DNA that is less densely packed with protein. The cytoplasm inside the nucleus is called the nucleoplasm. The Ribosomes The ribosomes are involved in translating genetic material into protein. Some are located on the endoplasmic reticulum - others are free floating in the cytoplasm. They contain two parts (or subunits), a smaller subunit called the 40S and a larger subunit called 60S. They are made from ribosomal RNA and protein. Summary Organelles are components of cells that have specific functions The nucleus contains the genetic information of the cell It is composed of a nucleolus, nucleoplasm and nuclear envelope The ribosomes translate genetic material from the nucleus into protein