Tag: biological molecules

Quizzes (9) Questions (101)

Questions Related to biological molecules

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

Carbohydrates, which are present in the cell membrane takes part in which of the following?

  1. Transport of substance.

  2. Cell recognition.

  3. Attachment to microfilament.

  4. Attachment to microtubules.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbohydrates which are present in the cell membrane take part in cell recognition. Cell recognition is defined as an active process giving rise to a specific response. 

Cell adhesion is a good example of cell recognition when it can be demonstrated that the adhesion is mediated by molecules having specific binding properties. Such cell adhesion molecules have now been identified in several cellular systems. Carbohydrates, or sugars, are sometimes found attached to proteins or lipids on the outside of a cell membrane. That is, they are only found on the extracellular side of a cell membrane. Together these carbohydrates form the glycocalyx. The glycocalyx of a cell has many functions. It can provide cushioning and protection for the plasma membrane, and it is also important in cell recognition. Based on the structure and types of carbohydrates in the glycocalyx, your body can recognize cells and determine if they should be there or not.

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

What should be given to an athlete for instant energy?

  1. Carbohydrates

  2. Protein

  3. Fat

  4. Vitamin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrate is essential as the most immediate and efficient fuel to the muscles. In its circulating form in the blood, carbohydrate is called as glucose, and its storage form in muscles and in the liver is called as glycogen. When the athlete first begins to exercise, body draws on the circulating glucose as its first source of energy. Glycogen, as the storage carbohydrate, comes in when circulating glucose drops to a lower level.  Without enough carbohydrates, performance as an athlete will be seriously impacted. 

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

In which one of the following groups, all the three are examples of polysaccharides :

  1. Starch, Glycogen, Cellulose

  2. Sucrose, Maltose, Glucose

  3. Glucose, Fructose, lactose

  4. Galactose, Starch, Sucrose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is option A i.e. "Starch, Glycogen, Cellulose"
Poysaccharides are carbohydrate polymers (e.g. starch, cellulose, or glycogen) which are made up of more than 10 sub-units of monosaccharide molecules join together.
Starch, glycogen and cellulose are polysaccharides of glucose. Maltose, sucrose and lactose are disaccharides, while, fructose and galactose are monosaccharides.

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

Decreasing order of amount of organic compound in animal body __________________.

  1. Carbohydrate, Protein, Fat and Nucleic acid

  2. Protein, Fats , Nucleic acid and Carbohydrate and nucleic acid

  3. Protein, Fats, Carbohydrate and Nucleic acid

  4. Carbohydrate, Fats, Proteins and Nucleic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The protein is the most important component of a cell. It forms an integral part of the cell membrane of all plants and animal cells. As a result protein is found in maximum amount in  human body.
Most of the hormones which are produced in the body and also constituents are blood are made up of proteins.
Apart from protein fat also has a considerable amount of mass in the body. this is followed by carbohydrate and the nucleic acid which is in least amount in the body.
Thus the correct option is C.



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

About 60% of our total energy requirements is met by 

  1. Vitamins

  2. Fats

  3. Proteins

  4. Carbohydrates
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbohydrates, proteins and fats in the foods provide energy for the body functions and physical activities. They, however, do not produce same amount of energy. the following is the energy-contribution by respective molecules.
Carbohydrates- 55-75% of energy contribution
Proteins- 10-15% of energy contribution
Fats- 15-30% of energy contribution
Therefore, the correct answer is option D.

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

Chemical nature of chitin is 

  1. Carbohydrate

  2. Protein

  3. Fat

  4. Nucleic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chitin is a carbohydrate. It is a long-chain polymer of a N-acetylglucosamine, a derivative of glucose, and is found in many places throughout the natural world. It is a characteristic component of the cell walls of fungi, the exoskeletons of arthropods such as crustaceans (e.g., crabs, lobsters and shrimps) and insects, the radulae of molluscs and the beaks and internal shells of cephalopods, including squid and octopuses. The structure of chitin is comparable to the polysaccharide cellulose, forming crystalline nanofibrils or whiskers. 

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

The energy produced by 1g of carbohydrate is

  1. 4.8 cal

  2. 4.2 kcal

  3. 9 joules

  4. 9.2 kcal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Carbohydrates, proteins and fats in the foods provide energy for the body functions and physical activities. They, however, do not have same energy content. The following is the energy-content by respective nutrients:
1 gram of carbohydrates- 4kcal
1 gram of protein- 4 kcal
1 gram of fats- 9 kcal
So, the correct answer is '4.2 kcal'
Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Which one is not a source of carbohydrates?

  1. Wheat

  2. Gram

  3. Rice

  4. Sorghum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The chickpea or chick pea is a legume of the family Fabaceae, subfamily Faboideae. It is also known as gram, or Bengal gram, garbanzo or garbanzo bean, and sometimes known as Egyptian pea, ceci, cece or chana, or Kabuli chana. It is the major source of proteins and not of carbohydrates. Wheat, rice and sorghum are the sources of carbohydrates. Thus, the correct answer is option B.