Which is synthesized in G1 phase ?
DNA polymerase
Histones
Nucleolar DNA
Tubulin protein
A.
DNA polymerase
Cell cycle is divided into 4 phases, namely, G1, S, G2 and M- phase.
DNA polymerase is synthesized in G1- phase. DNA and histones are synthsized during S- phase. Mitotic spindle begins to form during G2- phase. Karyokinesis and cytokinesis occur during M phase.
In a typical eukaryotic cell cycle, Gap 1, Synthesis and Gap 2 are the three phases included in the
Prophase
Metaphase
Anaphase
Interphase
Interphase
The S-phase of cell cycle is characterized by:
duplication of chromosome
shotening of chromosome
duplication of DNA
duplicatin of centriole
Match the sub-stage of prophase I of meiosis in Column I and the events in Column II and choose the right option.
| Column I | Column II |
| A. Leptotene | 1. Terminalization of chiasma |
| B. Zygotene | 2. Crossing over and recombination |
| C. Pachytene | 3. Synapsis |
| D. Diakinesis | 4. Visibility of chromosomes |
A - 1; B - 2; C - 3; D - 4
A - 1; B - 3; C - 2; D - 4
A - 4; B - 3; C - 2; D - 1
A - 4; B - 1; C - 2; D - 3
A - 4; B - 1; C - 2; D - 3
Which one of the following is the significance of mitosis?
Restricted to haploid cells
Cell repair
Increases the genetic variability
Recombination of chromosomes
Recombination of chromosomes
Chiasmata are most appropriately observed in meiosis during :
diakinesis
diplotene
metaphase II
pachytene
Find out the correct statement
During mitosis endoplasmic reticulum and nucleolus disappear completely at early prophase
Chromosomes are arranged along the equator during prophase of mitosis
Chromosome is made up of two sister chromatids at anaphase of mitosis
A cell plate is laid down during interphase
A cell plate is laid down during interphase
Which of the following maintain the constant number of chromosomes generation after generation?
Meiosis
Endomitosis
Mitosis
Amitosis
