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

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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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30 июн 2024

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Комментарии : 135

@ecave3435 8 месяцев назад

I left my book at school, thank you

@MissEstruchBiology 8 месяцев назад

You're welcome 😊

@robertasmith1116 Месяц назад

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

@BunnyJsTiktokChallenges5.9m 3 года назад

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

@MissEstruchBiology 3 года назад

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

@dasuninavodika7320 Год назад

@@MissEstruchBiology swe

@irshaadali795 2 года назад

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 года назад

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

@muktaryahye1189 8 месяцев назад

Me too❤😊

@BigRedKanga 7 месяцев назад

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 7 месяцев назад

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

@kunchaako3848 3 года назад

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

@MissEstruchBiology 3 года назад

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.

@edb3422 3 года назад

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

@MissEstruchBiology 3 года назад

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

@drhaneenali 3 года назад

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 года назад

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

@mjdalmoalem4871 3 года назад

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

@MissEstruchBiology 3 года назад

So pleased it helped you 😊😊

@ranix4866 3 года назад

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

@MissEstruchBiology 3 года назад

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

@sarahsalman4114 Год назад

Excellent video for quick revision... thanks!

@triciahardman5867 Год назад

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

@lc4979q Год назад

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

@aymanali6402 2 года назад

thank you so much for this video Miss Estruch

@MissEstruchBiology 2 года назад

You are so welcome! I hope its helpful :)

@AG-ql1sy 3 года назад

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

@MissEstruchBiology 3 года назад

😆😆 aww thank you!!

@priyajoseph144 3 месяца назад

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

@MissEstruchBiology 3 месяца назад

Thank you!

@callummullaney2353 3 года назад

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

@MissEstruchBiology 3 года назад

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

@florencesk2296 2 месяца назад

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

@MissEstruchBiology 2 месяца назад

You're welcome 😊

@__k.c.e.l.l.a8007 3 года назад

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

@MissEstruchBiology 3 года назад

So glad the video helped 😊

@user-qr7ex7fx7u 16 дней назад

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

@Anonymous-mg9nd Год назад

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

@MissEstruchBiology Год назад

you're so welcome

@tinachinyuka126 3 месяца назад

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

@user-mb7dk1ub4z Месяц назад

This woman is out here saving lives😭

@priyabharti3812 3 месяца назад

Thank you for amazing video 🙏🏻❤

@MissEstruchBiology 3 месяца назад

You are so welcome!

@user78832 9 месяцев назад

Words can’t describe how much I love this women

@MissEstruchBiology 9 месяцев назад

😂😂😂 glad the videos are helping

@user-tb7no8fd8p 10 месяцев назад

THANK you so much .

@MissEstruchBiology 10 месяцев назад

Hope it helps 😊

@ammosatti8988 8 месяцев назад

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 ❤

@jasonsingh9698 Год назад

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”

@tanvirdipsheikh1514 2 года назад

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

@Aisia-uc7ol Месяц назад

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 Месяц назад

Happy to help 😊

@samirkouzi 2 года назад

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

@MissEstruchBiology 2 года назад

You're so welcome!

@RennesPuffs10 5 дней назад

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

@MissEstruchBiology 4 дня назад

Yay,glad it helped 😁

@sophieramshaw8082 2 года назад

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 года назад

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

@sofiasolanki7839 3 года назад

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 года назад

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 года назад

@@MissEstruchBiology Ahh ok, thanks so much!

@alexiaplacinta5468 3 года назад

Very helpful

@MissEstruchBiology 3 года назад

So glad it helped you 😊

@9xelle 3 года назад

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 года назад

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

@idontknowwhattonamethis75h82 Год назад

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 Год назад

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

@shahilgaming68 2 месяца назад

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

@AS-qi2lq 2 года назад

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 2 года назад

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

@AS-qi2lq 2 года назад

Thank you!

@AS-qi2lq 2 года назад

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

@MissEstruchBiology 2 года назад

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.

@AS-mw6pw 3 года назад

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 года назад

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

@AS-mw6pw 3 года назад

@@MissEstruchBiology ok thanks Miss

@amttpassion9371 3 года назад

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 года назад

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 😊

@Naveenbabuborugadda 2 месяца назад

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

@aaronrajimon312 3 года назад

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 года назад

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 года назад

@@MissEstruchBiology ok thank you soo much :)

@jencyauriavales4278 2 года назад

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 года назад

yes, it's an unsaturated fat

@pakohlomani4100 3 года назад

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 года назад

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

@pakohlomani4100 3 года назад

Okay thanks

@haabeel7702 2 года назад

cheers

@darrenpattison7674 9 месяцев назад

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 9 месяцев назад

Very French pronunciation of you !

@darrenpattison7674 9 месяцев назад

@@MissEstruchBiology Haha so true.

@kamilaAhmedzai 2 года назад

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 года назад

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

@kamilaAhmedzai 2 года назад

@@MissEstruchBiology Thank you soo much!!!

@daltonbbosa7659 Год назад

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

@comixgamez3390 3 года назад

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

@MissEstruchBiology 3 года назад

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

@comixgamez3390 3 года назад

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

@sarahkreidly6732 Год назад

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

@MissEstruchBiology Год назад

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

@shahriarkawsar5526 Год назад

Thanks mam

@MissEstruchBiology Год назад

you're welcome 😊

@DavidCarbou 3 года назад

greatest channel of all time

@MissEstruchBiology 3 года назад

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

@ell6311 2 года назад

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

@MissEstruchBiology 2 года назад

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

@ell6311 2 года назад

@@MissEstruchBiology thank youuuu

@fergus3417 2 года назад

may i ask how is the starch orange in colour

@MissEstruchBiology 2 года назад

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

@dinnahzulu3382 Год назад

❤❤

@MissEstruchBiology Год назад

🙂

@avelaw1361 3 года назад

Hey

@MissEstruchBiology 3 года назад

👋

@moa7651 Год назад

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

@MissEstruchBiology Год назад

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 Год назад

@@MissEstruchBiology sorry its cus i do AQA

@Wojbest_YT 2 месяца назад

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

@keetanjohal3559 8 дней назад

Bit weird

@Wojbest_YT 8 дней назад

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

@keetanjohal3559 8 дней назад

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

@keetanjohal3559 8 дней назад

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

@Wojbest_YT 8 дней назад

@@keetanjohal3559 nah u cant that would be L rizz

@adamhilai5290 3 года назад

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

@MissEstruchBiology 3 года назад

ah sorry, I only speak English

@adamhilai5290 3 года назад

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

@adamhilai5290 3 года назад

Also digestion of starch

@adamhilai5290 3 года назад

@@MissEstruchBiology digestion of proteins and lipids

@adamhilai5290 3 года назад

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

@black79781 2 года назад

Can't you speak Hind mam?