Biomolecules

On hydrolysis, Lactose gives a mixture of:

Which of the following carbohydrates is classified as an aldopentose?

The total number of chiral carbon atoms in the open-chain structure of Glucose is:

Which sugar is found in the mammary glands of lactating animals?

Based on the physical and chemical classification of carbohydrates shown in the flowchart below, which pair of compounds correctly represents an example for category 'X' and category 'Y' respectively?

Which carbon atom of glucose is called the anomeric carbon?

When glucose is treated with $CH_{3}OH$ in the presence of dry $HCl$ gas, it forms methyl glucoside. This indicates the presence of:

In the reaction of glucose with excess acetic anhydride, the change in molecular mass of the glucose molecule is:

Which of the following pairs represent C-4 epimers?

The iodine test for starch produces a blue-black color because:

In the cyclic structure of glucose, how many chiral centers are present?

Which of the following products is formed when D-fructose is reduced with sodium amalgam and water?

The specific rotation of a freshly prepared solution of $\alpha$-D-glucose changes from $+112^{\circ}$ to a constant value of $+52.7^{\circ}$. This phenomenon is:

Which property is shared by both glucose and fructose regarding their behavior with Fehling's solution?

Which of the following best describes the optical activity of D-Fructose?

Which of the following hydroxyl groups in Glucose is the most reactive toward etherification with methanol/HCl?

Kiliani-Fischer synthesis is a method used to:

Which reagent is used to convert an aldose to its corresponding epimer at C2?

When D-glucose is treated with $CH_3I$ and $Ag_2O$ followed by hydrolysis with dilute $HCl$, the product is:

The total number of stereoisomers for the pyranose form of D-glucose (including all possible D and L aldohexoses) is:

For a molecule with 'n' chiral centers, how many total stereoisomers are possible?

What is the relationship between the configuration of D-Glucose and D-Mannose?

In a Fischer projection, the carbon chain is arranged:

Which carbon in D-Ribose (an aldopentose) is the chiral center furthest from the aldehyde group?

Which of these is a ketohexose that belongs to the $D$-series?

In $D$-glyceraldehyde, the groups attached to the chiral carbon are $-H, -OH, -CHO, -CH_2OH$. Which group is placed at the top in a standard Fischer projection for $D/L$ assignment?

What is the total number of $L$-aldohexoses?

How many chiral centers are present in $D$-Glyceraldehyde, and what is its IUPAC name including the stereochemical descriptor?

If $D$-Glucose and $L$-Glucose are mixed in equal proportions, what is the specific rotation of the resulting solution?

In the cyclic Haworth projection of an $\alpha$-$L$-glucopyranose, where is the $-CH_{2}OH$ group located?

Proteins that contain only amino acids upon hydrolysis are called:

How many water molecules are lost when four amino acids combine to form a tetrapeptide?

The Ninhydrin test is used to detect amino acids. What color is typically produced?

Insulin is a hormone that chemically belongs to which class of biomolecules?

In the context of protein chemistry, what is the role of 'Peptidyl transferase'?

Which of the following amino acids is aromatic?

The term 'zwitterion' comes from the German word for:

The $pK_{a}$ values for Glycine are 2.34 and 9.60. At what pH is the concentration of the zwitterion at its maximum?

Which of the following amino acids contains a secondary amine within its ring structure?

A protein solution is treated with concentrated $HNO_{3}$ and then with an excess of $NaOH$, resulting in an orange color. This confirms the presence of:

Which of these proteins has a quaternary structure consisting of two identical alpha chains and two identical beta chains?

The 'pleated' appearance of the $\beta$-sheet is due to the:

Which of the following links amino acids in the primary structure?

How many amino acid chains compose a single molecule of adult hemoglobin?

Which of the following factors can lead to the denaturation of proteins by disrupting hydrogen bonds and hydrophobic interactions?

What type of chemical reaction occurs during the formation of a peptide bond between two amino acids?

In the $\alpha$-helix, the hydrogen bonds are oriented in which way?

Which of the following describes the 'Tertiary Structure' correctly?

The peptide bond is nearly planar. In the 'trans' configuration, the dihedral angle $omega$ ($\omega$) is approximately:

Which of the following is the most significant force in stabilizing the quaternary structure of proteins like hemoglobin?

What is the consequence of exposing proteins to extreme pH values?

A protein in its native state is usually:

The loss of secondary and tertiary structure without breaking peptide bonds is called:

Which of the following will NOT typically denature a protein?

Which of the following statements about the denaturation of globular proteins is FALSE?

The denaturation of proteins is often accompanied by an increase in the number of detectable:

Which of the following is a result of the denaturation of the protein 'collagen' in meat during slow cooking?

In a 'two-state' denaturation model, which of the following is true regarding the population of protein molecules at any given time?

How does the addition of high concentrations of sucrose or glycerol affect the thermal denaturation temperature ($T_m$) of many proteins?

Which of the following physical properties typically remains largely UNCHANGED when a globular protein undergoes denaturation?

Night blindness (inability to see in dim light) is caused by the lack of:

Which vitamin's deficiency causes loss of hair and skin inflammation?

Which vitamin is also known as Ergocalciferol?

Which vitamin is unique because it cannot be obtained from plant sources and is found only in animal products like meat and curd?

Vitamins are classified as 'micronutrients' because they are:

Pernicious anemia is a severe condition that arises due to the inability to absorb:

Which vitamin is characterized by the presence of a $\\gamma$-lactone ring and two enolic hydroxyl groups?

Identify the vitamin that is synthesized by the action of sunlight on 7-dehydrocholesterol in the human skin.

Which vitamin is known to decrease the plasma level of triglycerides and cholesterol when administered in high pharmacological doses?

The deficiency of which vitamin is associated with a condition known as 'Burning Feet Syndrome'?

The base sequence in DNA carries the information for the sequence of:

The acidity of DNA and RNA is primarily due to the presence of:

Which of the following bases has a single-ring structure?

Nucleic acids are polymers of:

The process of transcription involves copying genetic information from a specific DNA strand into a complementary mRNA strand. If the DNA template strand has the sequence and polarity shown in the diagram, which of the following correctly represents the sequence and polarity of the resulting mRNA transcript?

In the sugar-phosphate backbone of a nucleic acid, the phosphate groups link adjacent pentose sugar molecules together to form a long polymer chain. Based on the structural numbering of the carbon atoms in the pentose sugar shown in the diagram below, which two carbon positions (labeled A-E) are involved in the formation of these phosphodiester linkages?

The process by which DNA makes an exact copy of itself is known as:

What is the specific geometry of the $N-glycosidic$ bond in the naturally occurring $D-$form of DNA nucleotides?

Which of the following factors does NOT contribute to the stabilization of the DNA double helix?

A DNA segment has a sequence $5'-AGCT-3'$. How many total hydrogen bonds are holding this sequence to its complementary strand in a double helix?