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  1. Problems
  2. /Organic Compounds with Functional Groups
  3. /Biomolecules

Biomolecules

Chemistry
+ Upload a Problem
More in Organic Compounds with Functional GroupsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomolecules
30 problems
Exam:
Type:
1.
Count the stereoisomers of four sugars, each with an unbranched carbon chain: an aldotetrose (4… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
2.
A sugar of molar mass 150 g/mol contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
3.
A hexose (molar mass 180.16 g/mol) is treated with excess acetic anhydride… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
4.
A student dissolves 2.50 g of pure α-D-glucose in water to make 25.0 mL of solution… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
5.
A solution of D-glucose in water has stood for a day… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
6.
D-galactose has the Fischer pattern R L L R for C-2 to C-5, where R means the -OH is on the right… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
7.
Glucose forms an osazone with phenylhydrazine: C₆H₁₂O₆ + 3C₆H₈N₂ → C₁₈H₂₂N₄O₄ + C₆H₇N + NH₃ + 2H₂O… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
8.
A syrup contains 100 g of sucrose (342.30 g/mol) and is hydrolysed completely… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
9.
A sample of 8.10 g of starch is hydrolysed completely to glucose… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
10.
A molecule of a branched glucose polymer has 6000 glucose units… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
11.
Three amino acids have no ionisable side chain… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
12.
Histidine has three ionisable groups: the α-COOH group (pK = 1.82), the imidazole ring of the side… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
13.
Cysteine has three groups that ionise: the α-COOH group (pK = 1.96), the thiol group of the side… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
14.
A primary amino group reacts with nitrous acid: R-NH₂ + HNO₂ → R-OH + N₂ + H₂O… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
15.
The tripeptide Gly-Ala-Ser is made from glycine (75.07 g/mol), alanine (89.09 g/mol) and serine… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
16.
Aspartame is the methyl ester of the dipeptide Asp-Phe… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
17.
A segment of a protein forms a single regular right-handed α-helix with 54 residues… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
18.
A peptide has five residues. Count the possible sequences in three cases… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
19.
A reaction in the body has an activation energy of 85 kJ/mol without a catalyst… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
20.
An enzyme reaction has an activation energy of 60 kJ/mol… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Hard
21.
A health leaflet lists eight vitamins: A, B1, B2, B12, C, D, E and K… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
22.
A student titrates 25.0 mL of orange juice with 0.0100 mol/L iodine solution… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
23.
Cyanocobalamin, vitamin B12, has the formula C₆₃H₈₈CoN₁₄O₁₄P and a molar mass of 1355.37 g/mol… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
24.
An analysis of double-stranded DNA from a bacterium shows that 22% of its bases are adenine… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Easy
25.
A stretch of double-stranded DNA has 50 base pairs, and 60% of the base pairs are G-C pairs… New
High School (11–12) · BiomoleculesStemPy LabStemPy Lab
Medium
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