CELL CYCLE (REVISION)

Statement 1- Since cell growth is a continuous process, DNA synthesis can occur in any stage in the cell cycle.

Statement 2- The replicated chromosomes (DNA) are distributed to daughter nuclei by a complex series of events during cell division. These events are themselves under genetic control.

• both statements are incorrect

• both are correct

• only statement 1 is correct

• only statement 1 is incorrect

Tags

NGSS.HS-LS1-4

Which statement is incorrect w.r.t phase marked as "A"?

• This phase corresponds to the interval between mitosis and initiation of DNA replication

• cell is metabolically inactive during this stage

• transcription and translation occurs in this stage.

• E.R and Golgi are synthesized in this phase.

Tags

NGSS.HS-LS1-4

Which statement is correct with respect to phase B?

• DNA amount is quadrupled.

• histone proteins are synthesized in this phase.

• In plant cells, centriole duplicate in this phase.

• After this phase, cell enters into M phase.

Tags

NGSS.HS-LS1-4

Phase A,B and C together represents the phase during which

• karyokinesis occurs, followed by cytokinesis

• DNA amount is reduced to half.

• nuclear membrane disappears

• the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner

Tags

NGSS.HS-LS1-4

Statement 1- Some cells in the adult animals do not appear to exhibit division (e.g. heart cells) and many other cells divide only occasionally, as needed to replace cells that have been lost because of injury or cell death.

Statement 2- Cells in this stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of the organism.

Above statements describe which phase of cell cycle?

• quiescent stage

• G1 phase

• Interphase

• M phase

How many chromosomes will a cell have at g2 phase of cell cycle , if it has 28 chromosomes in g1 phase?

• 14

• 56

• 28

• none of these

Tags

NGSS.HS-LS1-4

ln the somatic cell cycle

• DNA content doubles in G1 phase

• DNA replication takes place in S-phase

• A short interphase is followed by a long mitotic phase

• G2-phase follows mitotic phase

An egg cell has 20 picogram of DNA in its nucleus. How much amount of DNA will be present in this animal at the end of G2-phase of mitosis?

• 20 pg

• 40 pg

• 5 pg

• 80 pg

Tags

NGSS.HS-LS1-4

Find incorrect statement w.r.t given phase of cell cycle.

• complete disintegration of the nuclear envelope marks

  the start of this phase

• Chromosomal material continues to condense to form compact

  chromosomes.

• This phase is is characterised by all the chromosomes coming to lie at the equator

• This is the stage at which morphology of chromosomes is

  most easily studied

Tags

NGSS.HS-LS1-4

If the number of bivalents are 20 , What shall be the number of chromosomes in daughter cells after meiosis 1 and meiosis 2 respectively?

• 10 and 20

• 20 and 40

• 10 and 10

• 20 and 20