A-level BIOCHEMICAL TESTS- test for starch, reducing sugars, non-reducing sugars, proteins, lipids

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Күн бұрын

Learn the biochemical tests for A-level biological molecules topics. Most of these biochemical tests are also on the GCSE specification too. Learn how to test for starch, proteins, lipids, reducing and non-reducing sugars.
I have taken time-lapse videos of each experiment and photos so you can see the practicals in actions- hopefully, this helps!
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Пікірлер: 137

@ecave3435 9 ай бұрын

I left my book at school, thank you

@MissEstruchBiology 9 ай бұрын

You're welcome 😊

@robertasmith1116 2 ай бұрын

A friend took mine and tomorrow is my CIE AS LEVEL EXAM😂

@BunnyJsTiktokChallenges5.9m 3 жыл бұрын

Keep doing what you’re doing. The clarity you produced is amazing

@MissEstruchBiology 3 жыл бұрын

Thank you so much 😊 Means a lot to know the videos are helping.

@dasuninavodika7320 Жыл бұрын

@@MissEstruchBiology swe

@irshaadali795 2 жыл бұрын

I was sick from school and I miss this lab experiment but your video help me to get caught back up and understand everything. Thank you so much and keep being you.

@MissEstruchBiology 2 жыл бұрын

Amazing 😃😃 So pleased it helped you to catch up.

@muktaryahye1189 9 ай бұрын

Me too❤😊

@BigRedKanga 8 ай бұрын

I am a private student and self studying looking for a complete career change, I have found your videos that have been an amazing complement to the AQA text book. I watch your videos before studying the topic and it just makes so much more sense. Being a private student, it is tough to get into a lab, so thank you for these brilliant videos. I understand how much time they must take to compile. Thank you!

@MissEstruchBiology 8 ай бұрын

You are so welcome! I'm so pleased they are helping you 😊😊

@kunchaako3848 3 жыл бұрын

I love how you cover every spec point and put the mark scheme answers in bold. Thank you so so much!!

@MissEstruchBiology 3 жыл бұрын

Thank you! So glad you find it helpful the way it's presented. I try to keep it concise and linked to marking points to help with efficient revision.

@sarahsalman4114 Жыл бұрын

Excellent video for quick revision... thanks!

@edb3422 3 жыл бұрын

Who is mean enough to dislike these? They are amazing and so helpful, Thankyou so much 🙏

@MissEstruchBiology 3 жыл бұрын

haha thank you 😊 So pleased you find them helpful. Good luck with your exams!

@drhaneenali 3 жыл бұрын

thank you so much for this video Miss Estruch!! the bit about why the colour change starts at the top is so cool :) and the practical video is so helpful since we can't do practicals at the moment :(

@MissEstruchBiology 3 жыл бұрын

Really glad you found it helpful as a replacement for actually doing the practical.

@ranix4866 3 жыл бұрын

This channel is underrated You are legit the eliot rintoul of A level biology Great vid thank u!

@MissEstruchBiology 3 жыл бұрын

Thank you so much 😊😊 Hope the videos help your studies!!

@mjdalmoalem4871 3 жыл бұрын

thanks miss Estruch, you are amazing. I was so confused, but when I watched your video, you clarified everything

@MissEstruchBiology 3 жыл бұрын

So pleased it helped you 😊😊

@aymanali6402 2 жыл бұрын

thank you so much for this video Miss Estruch

@MissEstruchBiology 2 жыл бұрын

You are so welcome! I hope its helpful :)

@priyajoseph144 4 ай бұрын

Great video, thanks so much for all the tests in one and the final summary!!!

@MissEstruchBiology 4 ай бұрын

Thank you!

@user-qr7ex7fx7u Ай бұрын

The video is mazing so i have downloaded it. Thank u very much.

@callummullaney2353 3 жыл бұрын

Hello Miss!!!!! Thank you so much for the video :)

@MissEstruchBiology 3 жыл бұрын

You are very welcome! Really pleased it have helped you.

@AG-ql1sy 3 жыл бұрын

should be illegal to explain things as good as you do aha, some serious talent for teaching there

@MissEstruchBiology 3 жыл бұрын

😆😆 aww thank you!!

@florencesk2296 3 ай бұрын

Thank you so much, for some of us who are writing GCE.

@MissEstruchBiology 3 ай бұрын

You're welcome 😊

@triciahardman5867 Жыл бұрын

Excellent - great to share with students who have either not done or have forgotten food tests!

@lc4979q Жыл бұрын

i know you commented this ages ago, but do we need to add water to the sample along with benedicts?

@tinachinyuka126 3 ай бұрын

Wow this is helpful thanks so much God bless you abundantly ❤❤

@Anonymous-mg9nd Жыл бұрын

Thanks a lot Miss. It helped a lot...

@MissEstruchBiology Жыл бұрын

you're so welcome

@priyabharti3812 4 ай бұрын

Thank you for amazing video 🙏🏻❤

@MissEstruchBiology 4 ай бұрын

You are so welcome!

@__k.c.e.l.l.a8007 3 жыл бұрын

Thank you so much...i even learnt beyond my textbook

@MissEstruchBiology 3 жыл бұрын

So glad the video helped 😊

@user-tb7no8fd8p 11 ай бұрын

THANK you so much .

@MissEstruchBiology 11 ай бұрын

Hope it helps 😊

@user-mb7dk1ub4z Ай бұрын

This woman is out here saving lives😭

@ammosatti8988 9 ай бұрын

Hi from Pakistan, thanks for saving me. I have shared your this consolidated biochemical test video with my FSc ( high school's students) as I was guilty I couldn't deliver them enough in my practical class. Keep up good work . N I would like to suggest u a few more topics along with textbook material that needs 3D demonstration and practical demonstration. If u appreciate it, u may create a video on it. Stay blessed ❤

@tanvirdipsheikh1514 2 жыл бұрын

Hi, miss! What changes would you make to obtain semi-quantitative results, please?

@samirkouzi 2 жыл бұрын

Lovely work, this will be helpful for my tests. Thanks! ~Mustafa Dafalla.

@MissEstruchBiology 2 жыл бұрын

You're so welcome!

@user78832 9 ай бұрын

Words can’t describe how much I love this women

@MissEstruchBiology 9 ай бұрын

😂😂😂 glad the videos are helping

@jasonsingh9698 Жыл бұрын

Hi Miss, do we have to know specific measurements of how much reagent we have to add. Like do we have to say “add 2cm3 of Benedict’s reagent to the test tube”

@alexiaplacinta5468 3 жыл бұрын

Very helpful

@MissEstruchBiology 3 жыл бұрын

So glad it helped you 😊

@RennesPuffs10 29 күн бұрын

This is extra work given by my teacher, and wooh 😅 this is hard im currently in year 8 and this helped tyssm !!❤❤

@MissEstruchBiology 28 күн бұрын

Yay,glad it helped 😁

@sofiasolanki7839 3 жыл бұрын

Hi Miss Estruch, Firstly thank you for these videos, they're amazing!! I was just wondering if we need to know the names of the 'acid' and 'alkali' in the tests- like non-reducing sugars?

@MissEstruchBiology 3 жыл бұрын

Hello, No, its not specified on the specification. Just need to know it is 'boil in acid' and then add alkaline to make slightly alkaline as that is required for Benedicts

@sofiasolanki7839 3 жыл бұрын

@@MissEstruchBiology Ahh ok, thanks so much!

@sophieramshaw8082 2 жыл бұрын

Do we need to know why the colour change occurs at the top of the solution first for the exam ? is that on the spec ? Amazing videos ! I'm watching them all before my exams this year , I haven't been able to go to my lessons but have still got As thanks to you !!

@MissEstruchBiology 2 жыл бұрын

Hey not on the spec, but an example of an application question

@Aisia-uc7ol 2 ай бұрын

I did experiment but I didn't understand coz our lab supervisor didn't explain it properly but thanks for the help from this video.

@MissEstruchBiology 2 ай бұрын

Happy to help 😊

@shahilgaming68 3 ай бұрын

can please elaborate on how much you're adding like how many drops of acid

@9xelle 3 жыл бұрын

Hi :) I'm confused. In my book it says that for the buiret test for protiens that you need to add Sodium hyroxide solution to the test sample, then add Copper(II) sulfate solution. I'm not sure, in an exam situation, what to put to get the marks. Your explanation or the textbooks, OR is it the same thing? Thanks :))

@MissEstruchBiology 3 жыл бұрын

Hello, Those are the chemicals that biuret is made of, so you can say either in the exam 😊

@AS-qi2lq 3 жыл бұрын

Thanks so much for the video! Really helpful. I have a small doubt if you could answer. What exactly is the reagent in the lipid test? Is it ethanol or distilled water?

@MissEstruchBiology 3 жыл бұрын

There isn't a single reagent, both are required and both are worth separate marks in the exam. Hope that helps 😊

@AS-qi2lq 3 жыл бұрын

Thank you!

@AS-qi2lq 3 жыл бұрын

And also one more thing, is emulsion and turbidity the same thing?

@MissEstruchBiology 3 жыл бұрын

no, turbidity is a measure of cloudiness, but emulsion is the technical name for a fine dispersion of minute droplets of one liquid in another in which it is not soluble or miscible.

@myrtle9681 2 күн бұрын

Thanks for the contant

@MissEstruchBiology 16 сағат бұрын

You're welcome 😊

@haabeel7702 2 жыл бұрын

cheers

@Naveenbabuborugadda 2 ай бұрын

Which acid and alkali have you taken for the non reducing sugars?

@idontknowwhattonamethis75h82 Жыл бұрын

Hey miss, is it fine if i use some of the picture of your videos for my flashcards, non-commercial use. I would really like to take pictures of your tests and a few diagrams for my anki deck

@MissEstruchBiology Жыл бұрын

Hey yeah of course, that sounds like a good way to make flash cards

@pakohlomani4100 3 жыл бұрын

Hi Miss Estruch .Firstly thanks for the fascinating videos .I would like to ask about the negative result on lipids .Hmm what's the negative result

@MissEstruchBiology 3 жыл бұрын

The negative would be no white emulsion. There isn't a set colour to describe as ethanol is colourless.

@pakohlomani4100 3 жыл бұрын

Okay thanks

@daltonbbosa7659 Жыл бұрын

Thanks for that madam biology am kyobs science because I knew what I was eating

@AS-mw6pw 3 жыл бұрын

Hi Miss, for the test for proteins, do we just need to say ‘add Biuret solution’, because I was doing some questions from the revision guide and in the answers it says ‘add a few drops of sodium hydroxide solution, then add some copper (II) sulphate solution’.

@MissEstruchBiology 3 жыл бұрын

Hello, For AQA they accept either answer, so I always say biuret as it's less to remember 😊

@AS-mw6pw 3 жыл бұрын

@@MissEstruchBiology ok thanks Miss

@amttpassion9371 3 жыл бұрын

Hello. This video explained the biochemical tests really well, thank you! May I ask that I don't still get why the non-reducing sugar (sucrose) is not able to reduce the copper sulphate. Lactose and Maltose are also disaccharides, so how is this different to Sucrose, may I ask why aren't they non-reducing sugars. I hope that makes sense. Thank you Miss Estruch.

@MissEstruchBiology 3 жыл бұрын

Hello, Its because of the monomers sucrose is made of. Because it contains fructose, unlike the other two disaccharides, it forms a bond that prevents it from reducing Benedicts. Have a look at the pics in this link images.app.goo.gl/Nmo2ErcbUMPaURRS8 Hope that helps 😊

@shahriarkawsar5526 Жыл бұрын

Thanks mam

@MissEstruchBiology Жыл бұрын

you're welcome 😊

@kamilaAhmedzai 2 жыл бұрын

Hi Miss, just wondering about the test for protein, my textbook says to add sodium hydroxide and then copper ii sulfate and observe the color change. just wondering what I should write in an exam?

@MissEstruchBiology 2 жыл бұрын

that is a long description of the biuret test. Both would get a mark, but biuret is much quicker to write

@kamilaAhmedzai 2 жыл бұрын

@@MissEstruchBiology Thank you soo much!!!

@aaronrajimon312 3 жыл бұрын

Hello miss , I know this isnt part of the video , but im a 2 year a level student , i have my A LEVEL paper 1 exams in about 3 days , should i go through AS paper and A LEVEL PAPER , or should i just go through a level past paper

@MissEstruchBiology 3 жыл бұрын

Hello, It depends how much time you feel you have. The A-level papers should be a priority, but the AS papers do have a lot of really good maths questions and practical questions in too that will be helpful. If you have time, then yes I would recommend you do. Good luck!

@aaronrajimon312 3 жыл бұрын

@@MissEstruchBiology ok thank you soo much :)

@comixgamez3390 3 жыл бұрын

do we not need to specify which acid and alkaline to add for the non reducing sugar test?

@MissEstruchBiology 3 жыл бұрын

Hello, For AQA it doesn't specify that you need exact names of the acids and alkaline.

@comixgamez3390 3 жыл бұрын

@@MissEstruchBiology Okay thank you very much, I looked them up and they arent hard to remember.

@jencyauriavales4278 2 жыл бұрын

Just wondering, were we supposed to know oil is a lipid? Just a bit concerned because I didn't really know that Thank you!

@anittajose 2 жыл бұрын

yes, it's an unsaturated fat

@ell6311 2 жыл бұрын

Do you know what Reducing sugars we have to learn for AQA are?

@MissEstruchBiology 2 жыл бұрын

glucose, fructose, galactose, maltose and lactose 😊 Sucrose is non reducing

@ell6311 2 жыл бұрын

@@MissEstruchBiology thank youuuu

@sarahkreidly6732 Жыл бұрын

Whats the use of distilled water in tests ?do we use distilled water As a control? To compare other tubes with its results

@MissEstruchBiology Жыл бұрын

yes that's it! It's the control to show it was the test substance causing any changes seen

@darrenpattison7674 10 ай бұрын

I always thought Biuret was pronounced Bee-oooh-ray. Thats what I get from learning it by myself from a Textbook and no other input (until I discovered your channel of course) :)

@MissEstruchBiology 10 ай бұрын

Very French pronunciation of you !

@darrenpattison7674 10 ай бұрын

@@MissEstruchBiology Haha so true.

@DavidCarbou 3 жыл бұрын

greatest channel of all time

@MissEstruchBiology 3 жыл бұрын

☺☺ aww you're too kind, thank you!!! Hope the videos are helping you.

@fergus3417 2 жыл бұрын

may i ask how is the starch orange in colour

@MissEstruchBiology 2 жыл бұрын

Starch is colourless. It is the iodine that is orange, and it turns blue/black in the presence of starch

@dinnahzulu3382 Жыл бұрын

❤❤

@MissEstruchBiology Жыл бұрын

🙂

@avelaw1361 3 жыл бұрын

Hey

@MissEstruchBiology 3 жыл бұрын

👋

@moa7651 Жыл бұрын

this is wrong for protiens add NaOH then Copper Sulphate and if protien is present it turns purple

@MissEstruchBiology Жыл бұрын

Hello, that's what biuret reagent is. For most UK exam boards, they require the name of the reagent rather than the chemical composition

@moa7651 Жыл бұрын

@@MissEstruchBiology sorry its cus i do AQA

@adamhilai5290 3 жыл бұрын

I hope to speak Arabic because I don't understand very clear

@MissEstruchBiology 3 жыл бұрын

ah sorry, I only speak English

@adamhilai5290 3 жыл бұрын

But can you explain for me food and it's constitunets

@adamhilai5290 3 жыл бұрын

Also digestion of starch

@adamhilai5290 3 жыл бұрын

@@MissEstruchBiology digestion of proteins and lipids

@adamhilai5290 3 жыл бұрын

@@MissEstruchBiology and activity of enzymes because I have exam tomorrow and I don't understand any thing from my teacher because she 60years old

@Wojbest_YT 2 ай бұрын

3:46 if you didn't have file explorer open you would have doxxed your self

@keetanjohal3559 Ай бұрын

Bit weird

@Wojbest_YT Ай бұрын

@@keetanjohal3559 nah but her school logo was there im just saying

@keetanjohal3559 Ай бұрын

@@Wojbest_YT hahaha lmao join me i will find her school

@keetanjohal3559 Ай бұрын

@@Wojbest_YT Nvm she goes to woodford county high school for girls

@Wojbest_YT Ай бұрын

@@keetanjohal3559 nah u cant that would be L rizz

@black79781 2 жыл бұрын

Can't you speak Hind mam?