- [Easy]A naturally occurring biomolecule is a triester formed from glycerol and three long-chain fatty acid molecules, and it serves as a concentrated energy...
- [Easy]A patient presents with swollen, bleeding gums and slow wound healing, symptoms that historically afflicted sailors on long voyages without fresh prod...
- [Medium]Comparing the chemical makeup of RNA with that of DNA reveals two consistent differences in their building blocks. Which pair of differences correctly...
- [Hard]Both D-glucose and D-fructose give the same osazone when treated with excess phenylhydrazine, despite differing in their carbonyl functional groups. W...
- [Easy]Insulin and glucagon, both secreted by the pancreas, exert opposite effects on the concentration of glucose circulating in the blood. Which statement ...
- [Easy]A carbohydrate sample cannot be hydrolysed into any simpler sugar and contains a single polyhydroxy aldehyde unit with six carbon atoms. Into which ca...
- [Medium]Starch can be digested by humans for energy, whereas cellulose passes through the human digestive tract largely unchanged even though both are glucose...
- [Medium]Both maltose and lactose are disaccharides that give a positive Fehling's test and undergo mutarotation, unlike sucrose. What structural reason makes ...
- [Medium]Enzymes can accelerate biochemical reactions by factors of a million or more under mild conditions of temperature and pH. In thermodynamic terms, how ...
- [Medium]On treatment with concentrated nitric acid, D-glucose is oxidised at both ends of its carbon chain to give a dicarboxylic acid known as saccharic acid...
- [Easy]Sucrose does not reduce Tollens' reagent or Fehling's solution even though it is a disaccharide built from glucose and fructose units. What structural...
- [Medium]Excess intake of vitamin C is excreted readily in urine, while excess vitamin A tends to accumulate in the body and can become toxic. Which property d...
- [Easy]A student writes that a nucleoside and a nucleotide differ by only one component group. Which statement correctly distinguishes a nucleotide from the ...
- [Medium]At a pH equal to its isoelectric point, a neutral alpha-amino acid such as glycine shows essentially no migration in an electric field. What predomina...
- [Medium]Open-chain D-glucose reacts with hydroxylamine to give an oxime and adds one molecule of hydrogen cyanide, yet a freshly prepared solution shows mutar...
- [Easy]When two alpha-amino acids combine to form a dipeptide, the characteristic covalent bond that links them is formed between which pair of functional gr...
- [Easy]Saponification of fats produces:...
- [Easy]Insulin is a:...
- [Easy]Vitamin C is:...
- [Medium]Starch and cellulose differ in:...
- [Easy]DNA double helix is stabilized by:...
- [Easy]Enzymes are:...
- [Medium]At isoelectric point, an amino acid exists as:...
- [Easy]Vitamin D deficiency causes:...
- [Easy]Denaturation of proteins involves:...
- [Easy]Secondary structure of proteins is stabilized by:...
- [Easy]RNA differs from DNA in having:...
- [Easy]Benedict's test is positive for:...
- [Easy]The peptide bond is formed between:...
- [Easy]Glucose is a:...
- [Easy]Sucrose is a non-reducing sugar because:...