Chapter 2.3: Biological Molecules - Proteins

This video is the third section of AS Level Biological Molecules. It focuses on proteins, the structure of amino acids and how they come together through a condensation reaction to form a peptide bond, the different structures of proteins, their functions and some examples. In this video, I also mention the importance of haemoglobin referring specifically to its structure of having two alpha and two beta globin polypeptides. Each polypeptide has a haem group. Each haem group binds to an iron atom and each iron atom binds to an oxygen molecule. Note that one oxygen molecule has two atoms of oxygen,
To end the video, I discuss collagen and its advantages.

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i've been struggling to understand this sub-topic so much, but thanks to your video i can understand it clearly now ! once again, thankyouuu :)

[@maryowos7226]

You’re such a great Teacher. Thank you and God bless you.

[@luciemagniant7471]

Hi I just started ocr a level biology and I wanted to thank you for these videos, the clear structure and diagrams help so much to see before or after my lessons on it in class :)

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[@deffy343]

thank you so much for this video, i never actually understood this topic and i have an exam tomorrow, but you explained it so nicely and clearly. thank you so much Dr. Demilade!!

[@ruthdestinyongera7457]

Well explained and simple. God bless you doc

[@tringamurseli8058]

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[@lalayla7975]

there's a term sickle cells which is also in our hemoglobin topic it means that 1 amino acid on the surface of the beta pleated is replaced with a different amino acid the correct amino acid is glutamic acid which is polar and its substitute is valine which is non polar.i hope it's helpful.

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You explain this so well thank you for posting all this information on KZbin. My AP bio teacher is great but he explains too quickly or in short versions so I have to learn it for myself.

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Thank you so much madam, please kindly provide us with some questions

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Glad it was helpful!

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[@biowithdrdemi]

Glad I could help!

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I'm overwhelmed

[@biowithdrdemi]

Don't be. The channel has all that you need in easy-to-understand bits

[@judeedits4298]

Hello Dr.Demi, thank you for making these videos as you make the syllabus content very digestible. I would like to inquire whether you know of any qualified AS psychology teachers/tutors, including online syllabus resources for the subject. Best regards, and many thanks.

[@biowithdrdemi]

Hi Jude, I don't know of any teachers, but you van access some past papers using Papa Cambridge on this link pastpapers.papacambridge.com/?dir=Cambridge%20International%20Examinations%20(CIE)/AS%20and%20A%20Level/Psychology%20(9990) I would also suggest that you download the psychology syllabus from the CAIE website and read the learning outcomes for each chapter. You will typically be assessed based on the learning outcomes.

[@judeedits4298]

@@biowithdrdemi Hello Dr.Demi, i've previously dowloaded the syllabus and I have the course book for the subject. However, I'm searching for a tutor to assist me. Your efforts and prompt response are highly appreciated !

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Hey try using Psych Boost

[@NormenSojini-vy6gc]

Thanks

[@honey0331]

Hello, there. I am revising for my caies with your videos. thankyou so much for your hard work and dedication. One question, are we required to know all of the 20 amino acids

[@biowithdrdemi]

No you are not. You simply need to know the basic core structure of amino acids

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Hi guys At first thank you so much Dr. Second i wonder , if it's enough just watch these videos for IMAT axam or not ? Or (Do you have any advices to success in IMAT axam?:) )

[@joethecreeper8178]

Dr demi , i have to ask one question The 4 bonds you have mentioned in the video (hydrogen.dysulfhide etc) are they always between the side chains of amino acid?

[@biowithdrdemi]

Yes, they are typically between the side chains and other parts of the amino acids

[@chantellechisuko6968]

How is the structure of starch related to its function?

[@user-vw9cl2bw5k]

How do a bovine insulin structure look like?

[@ericmutuku-uu1jv]

How R group contribute to the globular structure of protein

[@oliviahaimbodi-js5nt]

what are the elements found in haemoglobin ????????

[@snemah]

Hello ma'am, I have a query, In the first slide you mentioned 'all enzymes are protein'. But ma'am, Ribozyme is a RNA enzyme and it's not a protein.

[@biowithdrdemi]

Ribozyme is an exception to this rule.

[@linakalilo735]

Mrs how do I identified the different between Alpha and beta chains

[@biowithdrdemi]

The alpha helix is more tightly coiled. The beta sheet is like a zig-zag

[@linakalilo735]

@@biowithdrdemi okay mrs thanks may God bless you..

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is this going by aqa ?

[@taesmullet2178]

no, it clearly says CIE

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Can you please give us the PowerPoint copy

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can you please provide notes of all chapters?

[@avadf8127]

notes are available on a website called save my exams

[@uimagima7104]

6:07 AMINO GROUP AND AMINE GROUPS IT IS THE SAME RIGHT ?

[@biowithdrdemi]

Yes, they are

[@mebadinfluence]

I think ALL enzymes are NOT proteins because ribozyme are RNA

[@biowithdrdemi]

I don't know what you mean by ribozymes but RNA is made of ribose sugar and nucleotides, amongst other things

[@mebadinfluence]

@@biowithdrdemi A ribozyme is a ribonucleic acid (RNA) enzyme that catalyzes a chemical reaction. The ribozyme catalyses specific reactions in a similar way to that of protein enzymes. Also called catalytic RNA, ribozymes are found in the ribosome where they join amino acids together to form protein chains.

[@EunicekyerewaaOsei]

Side chick 😂