Biomolecules
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New question posted
3 months agoNew answer posted
3 months agoContributor-Level 10
This is a Multiple Answer Type Questions as classified in NCERT Exemplar
The Correct option is b Glycogen resembles amylopectin in structure. It's a ? −D− glucose unit branched chain polymer with C1−C4 glycosidic linkage and C1−C6 glycosidic linkage branching. The structure of amylopectin is depicted in the diagram below.
New answer posted
4 months agoContributor-Level 10
14.33
The different types of RNA found in the cell are listed below:-
(i) Messenger RNA (m-RNA)
It carries the genetic message code from the DNA to ribosomes. It is produced by the DNA; m-RNA is also single stranded and constitutes about 15% of total RNA.
(ii) Ribosomal RNA (r-RNA)
It is found in the ribosomes and it is usually associated with protein to form the ribosomes. It is synthesised in the nucleus by DNA. It is single stranded, comprising about 80% of total RNA. It is metabolically stable.
(iii) Transfer RNA (t-RNA)
It is synthesised in nucleus by DNA. It is also called soluble RNA. It is single stranded. There are 20
New answer posted
4 months agoContributor-Level 10
14.32
The structural difference between DNA and RNA are as follows:-
The functional difference between DNA and RNA are as follows:-
New answer posted
4 months agoContributor-Level 10
14.31
In the helical structure of DNA, the two strands are held together by hydrogen bonds between specific pairs of bases.
Cytosine from hydrogen bond with guanine, while adenine forms hydrogen bond with thymine. As a result, the two strands are complementary to each other.
DNA consists of two strands of nucleic acid chains coiled around each other in the form of a double helix. The base of one strand of DNA is paired with bases on other strand by means of hydrogen bonding.
This hydrogen bonding is very specific as the bases can only base pair in a complementary manner.
Adenine pairs with only thymine via 2 hydrogen bonds and guanine pairs
New answer posted
4 months agoContributor-Level 10
14.30
A nucleoside is formed when l-position of a pyrimidine (cytosine, thymine or uracil) or 9- position of a purine (guanine or adenine) base is attached to C-l of sugar (ribose or deoxyribose) by a linkage. Thus in general, nucleosides may be represented as: Sugar-Base.
Nucleoside = sugar + base
On the other hand, all the three basic components of nucleic acids (i.e., pentose sugar, phosphoric acid and base) are present in a nucleotide.These are obtained by esterification of C5' –OH group of the pentose sugar by phosphoric acid. Thus, in general, a nucleotide is represented as:-
Nucleotide= sugar + base + phosphoric acid
New answer posted
4 months agoContributor-Level 10
14.29
Nucleic acids are Biomolecules which are found in the nuclei of all living cells, inform of nucleoproteins or chromosomes (proteins containing nucleic acids as the prosthetic group). Nucleic acids are of two types: – deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Nucleic acids are also known as Polynucleotide as they are long- chain polymers of nucleotides.
The two important functions of nucleic acids are listed below:-
(i) DNA which is responsible for the transference of hereditary effects from one generation to another, which is due to their property of replication during cell division as a result of which two identica
New answer posted
4 months agoContributor-Level 10
14.28
The deficiency of Vitamin A leads to Xerophthalmia which is hardening of the cornea of the eye and night blindness as well. Vitamin-C is essential to us because its deficiency causes scurvy which is a phenomenon of bleeding gums; and pyorrhoea which is phenomenon of loosening-bleeding of teeth.
The sources of vitamin A are fish, cod liver oil, carrots, butter and milk.
The sources of vitamin C are citrus fruits, lemon, amla and green leafy vegetables.
New answer posted
4 months agoContributor-Level 10
14.27
Vitamins can be defined as the essential dietary factors required by an organism in minute quantities and whose absence causes specific deficiency Vitamins are broadly classified into two types:-
(i) Fat-soluble vitamins:
These are oily substances not readily soluble in water. These include vitamins A, D, E and K. Vitamin K is responsible for the coagulation of blood.
(ii) Water-soluble vitamins:-
Vitamins that are soluble in water belong to this group. For example :B group vitamins (B1, B2, B6, B12, etc.) and vitamin C.
Vitamin H (Biotin) as an exception, it is neither soluble in water nor in fat
New answer posted
4 months agoContributor-Level 10
14.26
During denaturation, 2-degree and 3-degree structures of proteins are destroyed but 1- degree structure remains intact. As a result of denaturation, The globular proteins (soluble in water) are converted into Fibrous proteins (insoluble in water) and their biological activity is lost. For example, boiled egg which contains coagulated proteins cannot be hatched to produce chickens.
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