Edexcel BIOLOGY Doubts!!!!

[Ibiza279]

haha lol
nice
okay now me going to sleep have to wake up in about 7 hours lol
ok good night and Allah Hafiz

well takecare good nite sweet drms, n all the best fer tomorrow !

[haris94]

can some1 pls tell me the difference between collenchyma and sclerenchyma

Thanks

[nid404]

Collenchyma- tissues found in the leaves, young stems and below the epidermis. Specialized cells- It consists of elongated cells with irregularly thickened walls. They are living.

Sclerenchyma- They are found in the mature parts of the plants and are dead at maturity. They have thick lignified walls and are impermeable to water and nutrients. They are specialized for transport of water and nutrients.

[MKh]

hey guyz...i hav a qn in Bio A2 unit 6b:
what is meant by a null hypothesis??

[Deadly_king]

hey guyz...i hav a qn in Bio A2 unit 6b:
what is meant by a null hypothesis??

The null hypothesis is often the reverse of what the experimenter actually believes; it is put forward to allow the data to contradict it.

So according to the experiment carried out, you should state a hypothesis which you'll contradict through the experiment. Hence you'll observe that indeed the null hypothesis is wrong.

[MKh]

hey Thanks buddy!!...JAZAK ALLAH

[Deadly_king]

hey Thanks buddy!!...JAZAK ALLAH

Anytime 

[Uchia]

could any person explain to me the DNA profiling/finger print method

[-Cornea]

Hey.. Could anyone help me please with the condensation reaction between 2 fructose molecuoles i mean how the end product will look like :S and how can draw an unsaturated lipids

[guMnam]

where did u find tht q frm :/

[Deadly_king]

could any person explain to me the DNA profiling/finger print method

Well, that's very vast, you know.

I'll advice you to read the application booklet for Chemistry, it goes in detail about it and has been very useful to me

If you need any other specific explanation about it, let me know

[Deadly_king]

Hey.. Could anyone help me please with the condensation reaction between 2 fructose molecules?  i mean how the end product will look like :S and how could i draw an unsaturated lipids

Two fructose molecules will undergo condensation reaction to form a disaccharide. You just need to draw the two fructose molecules side by side. Then the H from one molecule will combine with the OH of the other molecule to form the sugar along with the release of water. A 1,4 glycosidic bond is formed.

Watch this. It's the formation of sucrose from glucose and fructose. The same principle will be applied for your question.

Unsaturated lipid are those which carbon-carbon double bonds in their hydrocarbon tails. So you just draw a normal lipid and add a C=C in its tail.

The picture attached represents an unsaturated fatty acid. So you just have to include it in your lipid.

[Master_Key]

Two fructose molecules will undergo condensation reaction to form a disaccharide. You just need to draw the two fructose molecules side by side. Then the H from one molecule will combine with the OH of the other molecule to form the sugar along with the release of water. A 1,4 glycosidic bond is formed.

Watch this. It's the formation of sucrose from glucose and fructose. The same principle will be applied for your question.

Unsaturated lipid are those which carbon-carbon double bonds in their hydrocarbon tails. So you just draw a normal lipid and add a C=C in its tail.

The picture attached represents an unsaturated fatty acid. So you just have to include it in your lipid.

Saturated lipids are mainly fats and are solids. Unsaturated lipids are mainly found as oils.

[Deadly_king]

Saturated lipids are mainly fats and are solids. Unsaturated lipids are mainly found as oils.

Thanks for the precision dude.

But I think she only wanted to know how to draw the structure of unsaturated lipids

[Master_Key]

Thanks for the precision dude.

But I think she only wanted to know how to draw the structure of unsaturated lipids

Then I am sorry.