Q. No.Identify the incorrect statement:
1.
The DNA of the bacteriophage ϕ X 174 has 5386 nucleotides.
2.
Bacteriophage lambda DNA has 48502 base pairs.
3.
The DNA of Escherichia coli has 4.6 X 103 base pairs.
4.
Haploid content of human DNA is 3.3 X 109 base pairs.
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In a DNA strand, two nucleotides are linked through a ___________ linkage to form a dinucleotide.
1. 3’ – 5’ phosphodiester bond
2. 5’ – 3’ phosphodiester bond
3. 1’ N-glycosidic bond
4. Two or three hydrogen bonds
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Replication in prokaryotes differs from replication in eukaryotes for which of the following reasons?
| 1. | Prokaryotic chromosomes have histones, whereas eukaryotic chromosomes do not. |
| 2. | Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic chromosomes have many. |
| 3. | The rate of elongation during DNA replication is slower in prokaryotes than in eukaryotes. |
| 4. | Prokaryotes produce Okazaki fragments during DNA replication, but eukaryotes do not. |
Consider the following two statements:
| I: | During transcription, the template strand is read in a 3'-to-5' direction. |
| II: | During transcription, an RNA is transcribed in the 5'-to-3' direction. |
The correct statements is/are:
| 1. | I only | 2. | II Only |
| 3. | I and II | 4. | None |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Identify the correct statements from the given statements and choose the correct option:
| I: | Both prokaryotic and eukaryotic mRNAs have a 5' cap. |
| II: | Only prokaryotic mRNAs are polyadenylated at the 3' end. |
| III: | In prokaryotes, transcription is coupled to translation. |
| IV: | In eukaryotes, RNA splicing occurs after the mRNA is transported into the cytoplasm. |
| V: | RNA splicing requires the formation of a spliceosome. |
| VI: | Both prokaryotic and eukaryotic mRNAs are synthesized by RNA polymerase. |
| 1. | III, V, and VI only |
| 2. | II, III, V, and VI only |
| 3. | I, III, V, and VI only |
| 4. | I, III, IV, V, and VI only |
| 1. | 35S | 2. | 32P |
| 3. | 15N | 4. | None |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA?
5'-CCUCAUAUGCGCCAUUAUAAGUGACACACA-3'
| 1. | pro his met arg his tyrlyscys his thr |
| 2. | met arg his tyrlyscys his thr |
| 3. | met arg his tyrlys |
| 4. | met pro his met arg his tyrlyscys his thr |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Which of the following is likely if there is a mutation in the lacY gene of the lac operon in E.coli?
| 1. | The lac genes would be expressed efficiently only in the absence of lactose. |
| 2. | The lac genes would be expressed efficiently until the lactose supply in the cell is exhausted. |
| 3. | The lac genes would be expressed continuously. |
| 4. | Expression of the lac genes would cease immediately. |
The difference between ATP and the nucleoside triphosphates used during DNA synthesis is that:
| 1. | The nucleoside triphosphates have the sugar deoxyribose; ATP has the sugar ribose. |
| 2. | The nucleoside triphosphates have two phosphate groups; ATP has three phosphate groups. |
| 3. | ATP contains three high-energy bonds; the nucleoside triphosphates have two. |
| 4. | ATP is found only in human cells; the nucleoside triphosphates are found in all animal and plant cells. |
Which of the following pairs of codons encode the same amino acid?
| 1. | AUG and AUC | 2. | UAA and UAC |
| 3. | GUA and GUG | 4. | UAG and UAC |
© 2026 GoodEd Technologies Pvt. Ltd.