Two nucleotides are joined together by a linkage known as: [2024]
Peptide linkage
Glycosidic linkage
Disulphide linkage
Phosphodiester linkage
(4)
Nucleotides are joined together by phosphodiester link between 5' and 3' carbon atom of the pentose sugar. Phosphoric acid is involved in the formation of this linkage.
Match List I with List II
| LIST I (Bio Polymer) | LIST II (Monomer) | ||
| A. | Starch | I. | nucleotide |
| B. | Cellulose | II. | -glucose |
| C. | Nucleic acid | III. | -glucose |
| D. | Protein | IV. | -amino acid |
Choose the correct answer from the options given below: [2024]
A-II, B-III, C-I, D-IV
A-II, B-I, C-III, D-IV
A-IV, B-II, C-I, D-III
A-I, B-III, C-IV, D-II
(1)
(A) Starch is polymer of -D-glucose.
(B) Cellulose is polymer of -D-glucose.
(C) Nucleic acids are formed by linking of nucleotides.
(D) Proteins are polymers of amino acids linked together by peptide bonds.
If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is: [2024]
CATTAGCT
TACGAAGT
GTACTTAC
ATGCGACT
(2)
The two strands are complementary to each other because the hydrogen bonds are formed between specific pairs of bases. Thus if one strand of a DNA has the sequence ATGCTTCA, sequence of bases in complementary strand is TACGAAGT.
The total number of correct statements, regarding the nucleic acids is ______
A. RNA is regarded as the reserve of genetic information
B. DNA molecule self-duplicates during cell division
C. DNA synthesizes proteins in the cell
D. The message for the synthesis of particular proteins is present in DNA
E. Identical DNA strands are transferred to daughter cells. [2024]
(3)
DNA is regarded as the reserve of genetic information, not RNA. DNA molecules self-duplicate during cell division and identical DNA strands are transferred to daughter cells. This is how genetic information is transferred.
Message for synthesis of proteins is present in DNA but actual synthesis of proteins is done by various RNA.
Thus (B), (D), and (E) are correct.
Total number of essential amino acid among the given list of amino acids is ______.
Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline. [2024]
(4)
Valine, arginine, phenylalanine and histidine are essential amino acids.
DNA molecule contains 4 bases whose structure are shown below. One of the structure is not correct, identify the incorrect base structure. [2024]
(4)
DNA contains four bases viz. adenine (A), guanine (G), cytosine (C) and thymine (T). RNA also contains four bases, the first three bases are same as in DNA but the fourth one is uracil (U).
The number of tripeptides formed by three different amino acids using each amino acid once is ______. [2024]
(6)
There are six possible ways to arrange three distinct objects a, b and c:
1. abc 2. acb 3. bca 4. bac 5. cab 6. cba
Hence, there are six tripeptides possible using three different amino acids, each used once. It should be noted that abc and cba are different tripeptides as illustrated below:
