Biomolecules

Cellulose is soluble is ammoniacal cupric hydroxide solution

On heating slowly sucrose melts and if allowed to cool, solidifies to pale-yellow glassy mass called barley sugar. At 483 K it loses water and forms a brown amorphous mass called caramel.

The structure of D-glyceraldehyde is as .The priority of groups is decided by the following rules
(i) Atom having higher atomic number gets higher priority.
(ii) If the priority cannot be decided by ruie I then the next atoms are considered for priority assignment.
(iii) Where there is a = bond or bond both atoms are

considered to be duplicated or triplicated . has
higher priority than -- Hence, the corret order
of priority of group in D-glyceraldehyde is as :

Despite having the aldehyde group, glucose does not give 2,4,-DNP test. Schiff's test and it does not form the hydrogen sulphite addition product with . It indicates the absence of free -CHO group.

Glucose and fructose are functional isomers.

The correct answer is option (A): When heated with HI it gives n-Hexane

When glucose reacts with HI it does not produce n-hexane. Glucose undergoes a dehydration reaction that leads to the formation of alkenes as products. The major product of this reaction is n-hexene. Hexene has a chemical formula of C₆H₁₂ and has a linear structure. The reaction involves the removal of water from glucose that forms n-hexene.

Step 1: Understand female sex hormones.
The main female sex hormones are estrogens and progesterone. Among estrogens, estradiol is the most important and biologically active hormone responsible for female reproductive functions.
Step 2: Role of estradiol.
Estradiol is responsible for the development of secondary sexual characteristics such as breast development, widening of hips, and regulation of menstrual cycle. It also controls the growth and maintenance of reproductive tissues.
Step 3: Analyze the options.

• (A) Glucagon: It regulates blood glucose levels, not related to reproductive system.
• (B) Testosterone: It is a male sex hormone.
• (C) Progesterone: It helps in maintaining pregnancy but is not primarily responsible for secondary sexual characteristics.
• (D) Estradiol: Correct. It regulates menstrual cycle and development of secondary female characteristics.

Step 4: Conclusion.
Therefore, the hormone responsible is estradiol.
Final Answer:Estradiol.

Step 1: Identify pyridoxine.
Pyridoxine is Vitamin B . It plays an important role in amino acid metabolism, neurotransmitter synthesis, and proper functioning of the nervous system.
Step 2: Effects of deficiency.
Deficiency of Vitamin B affects the nervous system because it is required for the synthesis of neurotransmitters such as serotonin and GABA. Lack of these neurotransmitters leads to abnormal nerve activity.
Step 3: Analyze the symptoms.

• (A) Cheilosis: Caused by deficiency of Vitamin B (riboflavin).
• (B) Beri beri: Caused by deficiency of Vitamin B (thiamine).
• (C) Scurvy: Caused by deficiency of Vitamin C.
• (D) Convulsions: Correct. Pyridoxine deficiency leads to neurological disorders including convulsions.

Step 4: Conclusion.
Hence, deficiency of pyridoxine results in convulsions.
Final Answer:Convulsions.

Step 1: Understand what a polysaccharide is.
Polysaccharides are complex carbohydrates made up of a large number of monosaccharide units joined together by glycosidic bonds. They are generally used for energy storage or structural purposes in living organisms.
Step 2: Identify the nature of ribose.
Ribose is a monosaccharide, not a polysaccharide. It is a five-carbon sugar, so it is classified as a pentose sugar. Ribose is an important component of RNA, ATP, and several biomolecules. Since it is a single sugar unit, it cannot be called a polysaccharide.
Step 3: Check the remaining options.

• (B) Starch: It is a polysaccharide made of many glucose units.
• (C) Gum: Gums are natural polysaccharides obtained from plants.
• (D) Glycogen: It is a storage polysaccharide found in animals and is made up of glucose units.

Thus, all these are polysaccharides except ribose.
Step 4: Conclusion.
Therefore, the substance which is not a polysaccharide is ribose.
Final Answer:Ribose.