Mar 30, 2013
A really useful website! Great for lazy students like me
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A really useful website! Great for lazy students like me
Flashcards in the form of Powerpoint slides I made for Chapter 4 of Form 4 Biology. I'll upload the rest of the subtopics when I'm done!
F4 Biology - Double Membrane Organelles Part 2
Sorry for the delay, my friends. Here's the part 2 of our double membrane organelles! 3. Nucleus Back in the lower form, all we see of our dear little nucleus is a dark circle thing in the middle of our animal and plant cells. It's like an egg yolk, right? Now, we're going to increase our magnification and see what's beyond the little nut. As you can see, it's a dense, large and spherical organelle, hence the dark colour. The nucleus consists of a) the nuclear envelope, which separates the contents of the nucleus from the cytoplasm, b) chromatin, which carries genetic material in the form of DNA, which determines the characteristics and the functions of the cell. Just so you know, chromatin is the form chromosomes take when the cell is not dividing. Lastly, c) a darker and dense region called the nucleolus. Like what we've learnt for the last three years, the nucleus acts as a brain for your cell. The DNA controls ALL activities. One of the examples would be the protein synthesis carried out by the ribosomes which is regulated by the coded information contained in the chromosomes. We out!