Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
Recombination of chromosome arms will occur
Chromosomes will not condense
Chromosomes will be fragmented
Chromosomes will not segregate
Related Questions
A cell in G2 phase has 4.8 pg of DNA. After completing mitosis, how much DNA would each daughter cell contain if cytokinesis is successful?
9.6 pg
4.8 pg
2.4 pg
1.2 pg
Which of the protein is found in spindle fibre?
Tubulin
Albumin
Mucin
Haemoglobin
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
As a coconut matures, the free-nuclear endosperm of the tender coconut undergoes changes. Which of the following best describes this transition?
Remains free-nuclear but increases in volume
Transitions from free-nuclear to cellular endosperm
Is replaced by a different type of endosperm
Is absorbed by the developing embryo
The liquid endosperm inside a tender coconut is equivalent to:
Free-nuclear endosperm
Cellular endosperm
Hemi-endosperm
Ruminate endosperm
At which stage of mitosis, chromatids separated and passes to different poles?
Prophase
Metaphase
Anaphase
Telophase
Spindles are formed by
Microtubules
Endoplasmic reticulum
Golgi body
Peroxisomes
Identify A-C in the given statements, and choose the correct option
I. Spindle microtubules that extend from the two poles of a dividing cell are called …A…
II. A centromere connects two identical copies of a single chromosomes. These two copies are called …B…
III. In ‘X’ phase, the paired chromosomes separate and begin moving to opposite ends of the cell. This ‘X’ is called …C…
A-kinetochore fibres; B-chromatids; C-metaphase
A-polar fibres; B-homologous chromosomes; C-Prophase
A-polar fibres; B-sister chromatids; C-anaphase
A-kinetochore fibres; B-asters; C-anaphase
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
Which one of the following precedes re-formation of the nuclear envelope during M-phase of the cell cycle?
Decondensation from chromosome and reassembly of the nuclear lamina
Transcription from chromosomes and reassembly of the nuclear lamina
Formation of the contractile ring and formation of the phragmoplast
Formation of the contractile ring and transcription from chromosomes
