Tag: biology

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

The cell wall of plants is made up of cellulose, which is

  1. A lipid

  2. A protein

  3. A polysaccharide

  4. An aminoacid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the primary plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix. The most common hemicellulose in the primary cell wall is xyloglucan.

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

The bonds present between two carbohydrates molecule is

  1. Glycosidic

  2. Hydrogen bond

  3. Phosphodiester

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

The bonds present between two carbohydrate molecules is glycosidic. A glycosidic bond is a type of covalent bond that joins a carbohydrate molecule to another group, which may or may not be another carbohydrate. A glycosidic bond is formed between the hemiacetal or hemiketal group of a saccharide and the hydroxyl group of some compound such as an alcohol. A substance containing a glycosidic bond is a glycoside.

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

Which of the following is sweet in taste but is not a sugar?

  1. Starch

  2. Saccharine

  3. Lactose

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

Sweet tasting carbohydrates are called sugars, e.g., glucose and fructose. Starch is a storage polymer of glucose and is tasteless till it is broken down into monomer glucose molecule. Lactose is milk sugar. Proteins are polymers of amino acids which are tasteless except for some like aspartic acid. Saccharine is an artificial sweetener. Saccharin is more sweet than common table sugar or sucrose but has a bitter after taste.

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

................... is not a carbohydrate.

  1. Starch

  2. Glycogen

  3. Wax

  4. Glucose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glucose is a monosaccharide carbohydrate. Glycogen is an important storage polysaccharide in animals like starch in plants. Glycogen and starch are homopolysaccharides made up of glucose units only. Glycogen is stored in liver and muscles in animals including humans. Starch is usually stored in endosperm and cotyledons of seeds. Waxes are a type of lipids.

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

Carbohydrates, the most abundant biomolecules on Earth, are produced by

  1. Some bacteria, algae and green plant cells

  2. All bacteria, fungi and algae

  3. Fungi, algae and green plant cells

  4. Viruses, fungi and bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates are the most abundant bimolecules found on the face of the earth. This is so because every year plants and alga through the process of photosynthesis converts more than 100 billion metric tones of $CO _2$ and $H _2O$ to cellulose and other products for use by the plants.

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

Carbohydrates are the body building nutrients.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Proteins are the body building nutrients. Cell is the building block of our body. Most of the structures of the cells are formed with protein. Without protein no cell can be formed and be functional. So, proteins are called the body building nutrients.

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

Carbohydrates are stored in mammals as

  1. Glucose in liver.

  2. Glycogen in muscles and spleen.

  3. Lactic acid in muscles.

  4. Glycogen in liver and muscles.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Excess glucose is stored as starch or glycogen. Starch is storage polysaccharide in plants. Glycogen is storage polysaccharide in animals. In animals, including humans, glycogen is stored in two locations: muscles and liver.

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.