Chromosomes
Trending Questions
Q.
Bivalents are formed in meiosis during _________ phase.
- leptotene
- zygotene
- pachytene
- diakinesis
Q.
Histone protein synthesis occurs during :
G1 phase
G2 phase
S phase
Prophase
Q. Which of the following is not a feature of the plasmids?
- Independent replication
- Circular structure
- Transferable
- Single-stranded
Q. Which of the following is not true w.r.t. copy number of the linked DNA in the vector?
- Depends on the sequence from where replication starts
- It is controlled by ori sequence
- It is equal to the copy number of vector in host cell
- It is controlled by selectable marker
Q. Which is the target for attachment of repressor protein produced by the regulator gene?
- Promoter
- Operator
- Structural gene
- Inducer
Q. Gene regulation governing lac operon of E.coli that involves the lac I gene product is:
- Negative and inducible because repressor protein prevents transcription.
- Positive and inducible because it can be induced by lactose.
- Feedback inhibition because excess of β-galactosidase can switch off transcription.
- Negative and repressible because repressor protein prevents transcription.
Q. Which of the following statements is NOT correct in regard to cell division?
Chromatin uncoils to form chromosomes.- Chromatin is found in the nucleus.
- Chromatin is made up of the DNA double helix and associated proteins.
Chromosomes can be seen just as cell division is about to occur
Q. Gene regulation governing lac operon of E.coli that involves the lac I gene product is:
- Positive and inducible because it can be induced by lactose.
- Feedback inhibition because excess of β-galactosidase can switch off transcription.
- Negative and inducible because repressor protein prevents transcription.
- Negative and repressible because repressor protein prevents transcription.
Q.
Replication of chromosomal DNA occurs during:
- Interkinesis
- Early prophase
- Late anaphase
- S-phase
Q. Chromatin fibers condense to form distinct structures called .
- chromosomes
- centrosome
- spindle fibres
- centrioles
Q. Which is the target for attachment of repressor protein produced by the regulator gene?
- Operator
- Promoter
- Inducer
- Structural gene