Zadanie 2d
The mean results are shown. Use membrane structure to explain the relationship.
- Materiał graficzny
Proteins
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 35 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 23 z 54 arkuszy w bazie.
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Zadanie 3
A student obtains all dietary protein from plants. Which statement about the student’s amino acid supply is correct? A. Human cells can synthesize some amino acids by modifying other organic molecules B. Every amino acid must be taken unchanged from an animal…
Zadanie 4
In a model reaction, glycine and serine join through a single peptide linkage. Which additional product is released by this condensation? A. A molecule of carbon dioxide B. A phosphate ion C. A molecule of water D. A molecule of oxygen
Zadanie 5
This diagram represents serine. Which labelled group occupies the variable side-chain position when different amino acids are compared? A. Group A B. Group B C. Group C D. Group D
- Materiał graficzny
Zadanie 8
During exercise, oxygen delivery must meet increased demand in mammalian tissues. (a) Outline the molecular structure of haemoglobin. (b) Explain how the Bohr effect improves delivery of oxygen to tissues with a high respiration rate. (c) Describe features of…
Zadanie 16
A pancreatic beta cell makes a polypeptide destined for insulin secretion. Where is the chain synthesized, and which bonds connect its amino acids? A. On Golgi membranes; ester bonds B. On ribosomes attached to rough ER; peptide bonds C. In lysosomes; hydrogen…
Zadanie 2a
State both products when two free amino acids undergo a condensation reaction forming one peptide bond.
Zadanie 2b
Describe how differences among amino acids contribute to the variety of protein shapes.
Zadanie 2c
A ribbon representation of part of titin is shown. (i) Describe the secondary structure represented by the arrows and how it is stabilised. (ii) Explain two contributions of titin to sarcomere function.
- Materiał graficzny
Zadanie 4
Which pairing correctly explains how a particular level of protein organisation is maintained? A. Primary structure — ionic attractions between separate subunits B. Secondary structure — disulfide links joining every neighbouring residue C. Quaternary…