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Quizzes

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7945 quizzes
Which of these sugars is a ketose? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
How many stereocentres does the open-chain form of an aldohexose have? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
Which pair of compounds are anomers? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
Sucrose is boiled with dilute acid. What forms? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
A student warms four sugar solutions with Tollens' reagent. Which one gives no silver mirror? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Complete hydrolysis of cotton and of rice flour gives the same sugar. Which fact explains why people can use rice flour for energy but not cotton? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Bromine water is added to a solution of glucose. The main product is New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
The α and β anomers of a sugar have specific rotations of +140 degrees and +40 degrees. A solution of either anomer settles to +100 degrees. What percentage of the settled mixture is the α anomer? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Hard
Assertion (A): Glucose does not give Schiff's test. Reason (R): In solution, glucose exists mainly in cyclic hemiacetal forms, with very little free aldehyde. New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
A 2-ketoheptose has a straight chain of seven carbon atoms with the C=O group on C-2. How many stereoisomers does it have? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Hard
One of the four natural amino acids named below has no stereocentre in its structure. Which one is it? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
In the solid state, an amino acid mainly exists as New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
An amino acid carries a second carboxyl group on its side chain. The pK values are 2.0 for the α-COOH group, 4.4 for the side chain and 9.2 for the α-NH3+ group. What is its isoelectric point? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Three different amino acids are joined in a chain, using each once. How many different tripeptides are possible? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
In an α-helix, the hydrogen bonds join New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Which change does not happen when egg white is boiled? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
An enzyme speeds up a reversible reaction. Which statement is correct? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Assertion (A): Milk curdles when it turns sour. Reason (R): The acid brings the pH close to the isoelectric point of casein, where the protein has no net charge and clumps together. New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Hard
By how much, in kJ/mol, must an enzyme lower the activation energy of a reaction at 298 K to make it exactly ten times faster? Use R = 8.314 J/(mol K) and assume the same frequency factor. New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Hard
How many stereoisomers does the dipeptide Ala-Thr have? Count every combination of D and L at each stereocentre. Alanine has one stereocentre and threonine has two. New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Hard
A sailor on a long voyage with no fresh fruit develops bleeding gums. Which vitamin is lacking? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
Which group contains only fat-soluble vitamins? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
Which base is found in RNA but not in DNA? New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Easy
Adenosine monophosphate is a New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
Two neighbouring nucleotides in a strand of DNA are joined by a New
High School (11–12) · Biomolecules
StemPy LabStemPy Lab
Medium
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