Consider the transcription unit given in the following diagram and choose the correct statements:
I: | The promoter on the template is situated upstream and 5’ to the structural gene. |
II: | It is the presence of the structural gene that defines the template strand. |
III: | The coding strand does not code for anything and is displaced during transcription. |
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
Consider the following statements:
I. | Deoxyribonucleoside triphosphates act as substrates as well as provide energy for polymerization reaction during DNA replication. |
II. | The replication of DNA is both semiconservative and semi-discontinuous |
III. | In bacterial DNA replication, there are multiple ori and replication fork moving bi-directionally |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
Study the diagram given below and choose the correct information that can be deduced:
1. | The core RNA polymerase is capable of catalyzing elongation only. |
2. | Sigma factor and Rho factor are needed for the termination of transcription. |
3. | DNA Helicase opens the strand of the DNA. |
4. | Both strands of DNA are transcribed by the same RNA polymerase. |
Consider the following diagram showing the working of the lac operon in E.coli in the presence of an inducer and choose the correct statement from the ones given below:
1. | A is the inducer and can be either lactose or cAMP. |
2. | B is the enzyme that will metabolize glucose, the preferred energy source. |
3. | Some amount of C will be present in the cell even if lactose is absent. |
4. | The absence of D will stop lactose from entering the cell. |
Which of the following cannot be inferred from the information given in the following diagram?
1. | The DNA from the crime scene matches that of individual B |
2. | VNTRs are hypervariable |
3. | The larger fragments remain near the point of introduction in the gel electrophoresis |
4. | The smaller chromosomes in the human genome have smaller repeats of VNTR |
Consider the following statements:
I: | In prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression. |
II: | Regulation of lac operon by CAP is referred to as negative regulation. |
III: | The inducer of the lac operon is lactose. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Consider the following statements:
I: | All the reference point while defining a transcription unit is made with the coding strand. |
II: | It is the presence of a promoter in a transcription unit that also defines the template and coding strands. |
III: | Exons are said to be sequences that do not appear in mature or processed RNA. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Consider the following statements:
I: | RNA is the genetic material of the QB bacteriophage. |
II: | DNA chemically is less reactive and more stable than RNA. |
III: | Viruses having RNA genomes and shorter life spans mutate & evolve slowly. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Consider the following statements:
I: | The largest known human gene is dystrophin at 2.4 million bases. |
II: | Repeated sequences make up a very large portion of the human genome. |
III: | There are about 2.4 million locations where single-base DNA differences occur in humans. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
The DNA profiles below represent four different individuals. Which of the following statements is consistent with the results?
1. B is the child of A and C.
2. C is the child of A and B.
3. D is the child of B and C.
4. A is the child of B and C.