In what form excess of glucose is stored in human body?
- A.Fructose
- B.Glycogen
- C.Glucose
- D.Starch
Correct answer
Explanation
The correct answer is B, Glycogen. When blood glucose is more than the body needs, the hormone insulin helps convert it into glycogen, which is stored mainly in the liver and the muscles.
Glycogen is a large, highly branched polysaccharide made of many glucose units, and it is often called "animal starch". Liver glycogen is broken down again into glucose when blood sugar falls, a process helped by the hormone glucagon, so it keeps the blood sugar steady between meals. Muscle glycogen is used by the muscle itself during exercise. Once the glycogen stores are full, further excess glucose is turned into fat and stored in adipose tissue.
A is wrong: fructose is a simple fruit sugar, not a storage form in the body.
C is wrong: glucose is the sugar that circulates in the blood; it is not stored as such in large amounts.
D is wrong: starch is the storage carbohydrate of plants, not of animals.
Exam tip: Plants store starch, animals store glycogen (liver and muscles); insulin stores sugar, glucagon releases it.
Practice Questions
View allConsider the following animals :
1. Hedgehog
2. Marmot
3. Pangolin
To reduce the chance of being captured by predators, which of the above organisms rolls up/roll up and protects/protect its/their vulnerable parts?
- A.1 and 2
- B.2 only
- C.3 only
- D.1 and 3
Show answer
Hedgehogs and pangolins curl into a tight ball when threatened, covering the soft belly and face with spines or scales; marmots do not.
Read the full explanation →Which one of the following is used in preparing a natural mosquito repellent?
- A.Congress grass
- B.Elephant grass
- C.Lemongrass
- D.Nut grass
Show answer
Lemongrass and its close relative citronella grass yield aromatic oils that keep mosquitoes away, so they are the base of many natural repellents.
Read the full explanation →Which one of the following devices is non-ohmic ?
- A.Conducting copper coil
- B.Electric heating coil
- C.Semi conductor diode
- D.Rheostat
Show answer
A diode does not obey Ohm's law: the current through it is not proportional to the voltage across it. An ohmic conductor gives a straight-line graph of current against voltage, so its resistance stays constant at a fixed temperature.
Read the full explanation →What is the formula mass of anhydrous sodium carbonate? (Given that the atomic masses of sodium, carbon and oxygen are 23 u, 12 u and 16 u respectively)
- A.286 u
- B.106 u
- C.83 u
- D.53 u
Show answer
Anhydrous sodium carbonate is Na₂CO₃, and 2 × 23 + 12 + 3 × 16 = 106 u. Formula mass is the sum of the atomic masses of all the atoms in one formula unit of an ionic compound.
Read the full explanation →Which one of the following minerals is used as a fuel in nuclear power stations ?
- A.Bauxite
- B.Quartz
- C.Feldspar
- D.Pitchblende
Show answer
Pitchblende, or uraninite, is the chief ore of uranium, the fuel used in most nuclear power stations. Pitchblende is a heavy, black mineral made mostly of uranium oxide.
Read the full explanation →