Use NAND/NOR to express X = ABC + AB̅C + ABC̅ X = (A + B ·C)...

Use NAND/NOR to express X = ABC + A\bar{B}C + AB\bar{C} X = (A + B \cdot C) + \overline{(D + E)} X = A \cdot B + \overline{A} \cdot \overline{B} X = A \cdot \bar{B} + \bar{A} \cdot B

Transcript

00:01 So this page has a couple of blank filling questions.

00:07 Some of them have answered already, but i'm going to talk about every single one just to make sure.

00:13 The first one is talking about chromatin fiber.

00:17 So what is it made of? chromatin fiber, as you see on the board, this is the yellow part is the chromatin fiber.

00:24 If we take them apart, you can tell that the unit that made up of chromatin fiber is looked like this yellow, yo -yo with the blue thread.

00:33 This is a single unit is called the nucleosum.

00:37 So if we take a look at the detail of this nuclear sun, you can see the yellow core is made up eight different histone proteins.

00:46 We call it octamer.

00:48 And then the blue thread wrap around the histone octamer is dna.

00:53 So if you take a look at this piece, it looks like beads on a string.

01:00 Now, these bees on the string, they actually become condensed and compacted.

01:04 They actually form a chromatin fiber.

01:07 So the answer is the chromatin is made up of dna and histones.

01:13 The second question asked about the sister chromatids.

01:16 So during cell division, obviously the chromosome will have to go through duplication or replication to make its copy.

01:23 So the two copy, there are identical, called sister chromatids.

01:28 In the first couple of stage of cell division, the sister chromatids are attached together by this structure called centromere.

01:38 So they actually are attached to each other until anapace.

01:42 Anapace of the cell division or mitosis, central muscle breakdown.

01:47 The sister cromit separate and they move towards the opposite of the pole and become two -daughter cell.

01:52 So before anapace of mitosis, centromere is the structure that puts, the two sister chromatids together.

02:01 The next part, question three, talk about dna double helix structure.

02:05 So double helic structure is first discovered by scientists rosalind franklin...

Question

Use NAND/NOR to express X = ABC + A\bar{B}C + AB\bar{C} X = (A + B \cdot C) + \overline{(D + E)} X = A \cdot B + \overline{A} \cdot \overline{B} X = A \cdot \bar{B} + \bar{A} \cdot B

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