Tag: biology

Questions Related to biology

Iodine test used to detect

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Protein

  2. Fat

  3. Carbohydrate

  4. Chitin

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Correct Option: C

Starch changes colour and turns blue-black in ............ solution.

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Salt

  2. Eosin

  3. Iodine

  4. Dilute HCl

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Correct Option: C
Explanation:

Iodine present in the aqueous Potassium iodide solution gets entangled in the starch and forms starch Iodide complex. Hence starch turns blue-black or purple-black in colour.

So, the correct answer is option C.

A leaf is boiled in alcohol before using iodine for a starch test in order to

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. dissolve starch

  2. dissolve chlorophyll

  3. soften the leaf

  4. make it react with iodine

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Correct Option: A

What is the $R.Q.$ of glucose?

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. One

  2. Less than one

  3. More than one

  4. Infinite

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Correct Option: A

The post prandial glucose can be measured 

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Empty stomach

  2. Any time

  3. 2 hours after lunch / dinner

  4. Early in the morning

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Correct Option: C
Explanation:

Blood glucose levels are maintained by hormones, such as insulin and glucagon. A postprandial glucose test is a blood glucose test that determines the amount of glucose in the blood after a meal. Normally, blood glucose levels increase slightly after eating. This increase causes the pancreas to release insulin. A postprandial blood glucose test measures blood glucose exactly 2 hours after eating a meal. By this point, blood sugar has usually gone back down in healthy people, but it may still be elevated in people with diabetes.

For the test of sugars _______ is used.

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Fehling's solution

  2. Benedict's solution

  3. Iodine solution

  4. All of the above

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Correct Option: D
Explanation:

A little glucose is added to a blue green chemical called as Fehling's solution in a test tube for test of glucose.

Benedict's solution can be used for detecting reducing sugars.
Iodine solution also called as Lugol's reagent is used for detection starch and complex sugars. So, the correct answer is option D. 

Which of the following gives Fehling's test? 

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Pectin

  2. Sucrose

  3. Cellulose

  4. Glucose

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Correct Option: D
Explanation:

Fehling's test is given by glucose, which is a reducing sugar. It produces a red precipitate with Fehling's solution A and B, when heated.

How many NADH molecules are produced during the complete breakdown of one molecules of glucose?

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. 5

  2. 10

  3. 30

  4. 6

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Correct Option: A

Fehlings solution is used to detect 

biology biological molecules energy giving food carbohydrate and its test food and it's constituents

  1. Sucrose

  2. Glucose

  3. Fat

  4. Starch

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Correct Option: B
Explanation:

Fehlings can be used to screen for glucose in urine, thus detecting diabetes. 

So, the correct answer is option B.

Which part of thyroid cartilage in larynx is closed?

biology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Dorsal

  2. Ventral

  3. Anterior

  4. Posterior

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Correct Option: B
Explanation:

Larynx lies ventral to the thyroid cartilage. The thyroid cartilage is the largest of the laryngeal cartilages. The thyroid cartilage forms the bulk of the front wall of the larynx. It protects the vocal cords, which are located directly behind it.