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

Which one will yield less than $4$ ${kcal}/{mol}$ of energy when phosphate bond is hydrolysed?

  1. ADP

  2. ATP

  3. Creatine phosphate

  4. Glucose 6-phosphate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The bond between two phosphate groups is a phosphoanhydride bond which is considered as high energy bond. ATP has two high energy phosphoanhydride bond. ADP has one phosphoanhydride bond. Creatine phosphate also has high phospahte bond between the nitrogen and phosphate. The phosphate bond in glucose phosphate is the weakest so it will yield less than 4kcal/mol of energy when phosphate bond is hydrolysed.

So, the correct answer is option D.

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

This is a storing organ.

  1. Gall bladder

  2. Liver

  3. Pancreas

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

The gallbladder is a small storage organ located inferior and posterior to the liver. Though small in size, the gallbladder plays an important role in our digestion of food. The gallbladder holds bile produced in the liver until it is needed for digesting fatty foods in the duodenum of the small intestine.

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

A chemical where both D-galactose and L-galactose are present is

  1. Hyaluronic acid

  2. Agar-agar

  3. Lactose

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

Hyaluronic acid is a glycosaminoglycan composed of repeating disaccharide units of D-glucuronic acid and N-acetyl-D-glucosamine. The question might be referring to specific complex polysaccharides; however, agar-agar is also a complex mixture. Given the options, Hyaluronic acid is the standard answer in many textbooks for this context.

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

Which is true about heparin and hyaluronic acid?

  1. Both are mucopolysaccharides

  2. They are formed of glucuronic acid and glucosamine

  3. Heparin is anticoagulant while hyaluronic acid is lubricating

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mucopolysaccharides are the chain of sugar which is mainly found in the mucus and fluids present in the joints.
Heparin is an anticoagulant as they prevent the clotting of the blood. It inactivates the thrombin in the clotting process. It is produced by the produced by basophils and mast cells. It is synthesized in the liver and circulates in plasma. It is a glycosaminoglycan.
Hyaluronic acid acts as a cushion and lubricant in the joints and other tissues. It also helps in the capacitation of the sperms. It is also found in the fluid of eyes and joints. 
So, the correct answer is option C.
Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

The most common monomer of carbohydrates is a molecule of

  1. Glucose

  2. Maltose

  3. Amino acid

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

Glucose is the simplest 6 carbon molecule that is the most common monomer of carbohydrates. It is the most abundant monosaccharide with the molecular formula C$ _6$H$ _1$$ _2$O$ _6$. It is mostly made by plants and green algae during photosynthesis.

Maltose is a disaccharide made of two molecules of glucose units.
An amino acid is the monomer of the proteins or polypeptide chains.
Phospholipids are mainly present in the cell membrane of animals that are made of phosphate and lipid molecules.
So, the correct option is 'Glucose'.

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

Which one of the following is a non - reducing carbohydrate?

  1. $\displaystyle Maltose$
  2. $\displaystyle Sucrose$
  3. $\displaystyle Lactose$
  4. $\displaystyle Ribose$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A non-reducing sugar is a carbohydrate that is not oxidized by a weak oxidizing agent (an oxidizing agent that oxidizes aldehydes but not alcohols, such as the Tollen's reagent) in basic aqueous solution. The characteristic property of non-reducing sugars is that, in basic aqueous medium, they do not generate any compounds containing an aldehyde group. Example : sucrose, which contains neither a hemiacetal group nor a hemiketal group and, therefore, is stable in water.

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

The prosthetic group of a conjugated protein classified as a glycoprotein is a

  1. Chromomorphic group

  2. Polysaccharide

  3. Metal ion

  4. Lipid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A conjugated protein is a protein that functions in interaction with other (non-polypeptide) chemical groups attached by covalent bonding or weak interactions.  The non-amino part of a conjugated protein is usually called its prosthetic group. Most prosthetic groups are formed from vitamins. Glycoproteins are proteins that contain various amounts of carbohydrate. A number of very important proteins fall in this class, including many of the blood plasma proteins and a large number of en­zymes and hormones. The carbohydrate bonded at each site of the protein may consist of a sin­gle monosaccharide unit or a linear or branched chain of several mono saccharides (called an oligosaccharide).

So, the correct answer is 'Polysaccharide'.
Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Three important polysaccharides made up of glucose monomers are-

  1. Sucrose, Lactose, Maltose

  2. Chitin, Glycogen, Starch

  3. Starch, Glycogen, Cellulose

  4. RNA, DNA, Starch
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Polysaccharides are carbohydrates whose molecules are made up of sugar molecules bonded together. They are composed of long-chain of monosaccharides. They range in structure from linear to highly branched form. They are made up of sugar mainly including glucose, fructose, etc.
So, the correct option is 'Sucrose, Lactose, Maltose'.

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

A polysaccharide is made up of which kind of monomers?

  1. Simple sugars

  2. Amino acids

  3. Nucleotides

  4. Fatty acids and glycerol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Simple sugars are the monomers for the polysaccharides or carbohydrates. Simple sugars include glucose, fructose, ribose, xylose, etc.

Amino acids are the monomers for the polypeptide chains or proteins.
Nucleotides are the monomers of the nucleic acids i.e. DNA and RNA. Each nucleotide contains mainly three parts, namely sugar molecule, a nitrogenous base and a phosphate molecule.
Three molecules of fatty acids and one molecule of glycerol together form the fats and oils.
So, the correct option is 'Simple sugars'.