Biochemia I – ćwiczenia

do wykładu dr. hab. inż. P. Dobryszyckiego

LISTA ZADAŃ Węglowodany

1. Examine the following five sugar structures:

Which of these sugars

(a) contain or are pentoses?

(b) contain or are ketoses?

(c) contain the same monosaccharides? Name those monosaccharides.

(d) will yield different sugars after chemical or enzymatic hydrolysis of glycosidic bonds?

(e) are reducing sugars?

(f) contain a β-anomeric carbon?

(g) is sucrose?

(h) are released upon the digestion of starch?

2. Referring to the structure of ATP as shown below, which of the following statements are true?

The structure of ATP

(a) contains a β-N-glycosidic linkage.

(b) contains a pyranose ring.

(c) exists in equilibrium with the open Fischer structure of the sugar.

(d) preferentially adopts a chair conformation.

(e) contains a ketose sugar.

3. Glycoproteins

(a) contain oligosaccharides linked to the side chain of lysine or histidine residues.

(b) contain oligosaccharides linked to the side chain of asparagine, serine, or threonine residues.

(c) contain linear oligosaccharides with a terminal glucose residue.

(d) bind to liver cell-surface receptors that recognize sialic acid residues.

(e) are mostly cytoplasmic proteins.

Lista Zadań Węglowodany

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4. Which of the following statements about the Golgi complex are correct?

(a) It is a stack of flattened proteoglycan sacs.

(b) It carries out core glycosylation of the proteins being transported.

(c) It is the major protein-sorting center of the cell.

(d) It receives proteins from the ER by fusion with transport vesicles.

(e) It forms secretory granules in its trans compartment.

(f) The cisternae of the cis, medial, and trans compartments are connected by pores.

5. Which of the following statements about lectins are true? Lectins (a) are produced by plants and bacteria.

(b) contain only a single binding site for carbohydrate.

(c) are glycosaminoglycans.

(d) recognize specific oligosaccharide patterns.

(e) mediate cell-to-cell recognition.

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