In a plant cell undergoing mitosis, a mutation disrupts the function of phragmoplastin. Which stage of mitosis will be most directly affected, and what would be the observable consequence?
Prophase; failure of chromosome condensation
Metaphase; misalignment of chromosomes at the metaphase plate
Anaphase; inability of sister chromatids to separate
Cytokinesis; incomplete cell wall formation
Related Questions
During mitosis, which of these processes does NOT take place?
DNA replication
Separation of sister chromatids
Formation of the mitotic spindle
Cytokinesis
All of the following are observed during mitotic cell division EXCEPT:
Chromosome condensation
Spindle formation
Nuclear envelope breakdown
Genetic recombination through crossing over
I. Phases of cell cycle are controlled by proteins, …A… and …B…
II. There are two regulatory mechanisms, called …C… which take decision about cell division.
III. The second check point, called …D… is responsible for transition from to M-phase.
Identify A-D to complete the given statements (I-III)
A-cyclins; B-CdKs; C-check points; D-mitotic cyclin (Cm)
A-cyclins; B-check points; C-mitotic cyclin, D-CdKs
A-mitotic cyclin (Cm), B-CdKs; C-check points, D-Cyclin
A-mitotic cyclin (Cm), B-cyclins; C-check points, D-CdKs
If a cell undergoing division exhibits synapsis and crossing over, which type of cell division is it NOT undergoing?
Mitosis
Meiosis I
Meiosis II
Binary fission
The spindle microtubules are polar, their orientation is
Positive (+) and negative (-) both ends towards the equator
Positive (+) ends towards the poles
negative (-) ends towards the poles
Positive (+) and negative (-) both ends towards the poles
In an experiment, cells are arrested in metaphase using colchicine, a drug that inhibits microtubule polymerization. If these cells are then fused with cells in G1 phase, what is the most likely outcome for the G1 chromosomes?
The G1 chromosomes will replicate their DNA.
The G1 chromosomes will condense prematurely.
The G1 chromosomes will remain unaffected.
The G1 chromosomes will fragment.
Which of the following accurately describes the role of motor proteins during anaphase of mitosis?
Kinesins move chromosomes towards the minus ends of kinetochore microtubules, and dyneins move chromosomes towards the plus ends.
Dyneins move chromosomes towards the poles along kinetochore microtubules, while kinesins are involved in cytokinesis.
Kinesins move chromosomes towards the plus ends of kinetochore microtubules, while dyneins move the poles apart by acting on astral microtubules.
Both kinesins and dyneins move chromosomes towards the poles along kinetochore microtubules, with kinesins acting on the leading edge and dyneins on the trailing edge.
Which of the following events is NOT characteristic of mitotic cell division?
Condensation of chromosomes
Replication of DNA
Synapsis and crossing over
Formation of the spindle apparatus
I. Phases of cell cycle are controlled by proteins, …A… and …B…
II. There are two regulatory mechanisms, called …C… which take decision about cell division.
III. The second check point, called …D… is responsible for transition from to M-phase.
Identify A-D to complete the given statements (I-III)
A. Cyclins; B. CDKs; C. Checkpoints and growth factors; D. checkpoint
A. CDKs; B. Cyclins; C. Growth factors and kinases; D. M checkpoint
A. Kinases; B. Cyclins; C. Checkpoints and cyclins; D. checkpoint
A. Cyclins; B. CDKs; C. Mitosis promoting factors; D. S checkpoint
I. Phases of cell cycle are controlled by proteins, …A… and …B…
II. There are two regulatory mechanisms, called …C… which take decision about cell division.
III. The second check point, called …D… is responsible for transition from to M-phase.
Identify A-D to complete the given statements (I-III)
A-cyclins; B-CdKs; C-check points; D-mitotic cyclin (Cm)
A-cyclins; B-check points; C-mitotic cyclin, D-CdKs
A-mitotic cyclin (Cm), B-CdKs; C-check points, D-Cyclin
A-mitotic cyclin (Cm), B-cyclins; C-check points, D-CdKs
