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A. Most dramatic period of cell cycle involving a major reorganization of virtually all components of the cell
B. It represents the phase when the actual cell division occurs
These statements (A & B) are concerned with
1. S-phase
2. G₁ phase
3. M-phase
4. G₂ phase

Select the correct statement

Interkinesis stage of cell cycle

Select the incorrect statement

Cells that do not divide further exit G₁ phase to enter an inactive stage called

Select the odd one out with respect to mitosis

Select the mis-matched pair

Microtubules from opposite poles of the spindle attach to the pairs of homologous chromosomes during

Exchange of genetic material between two homologous chromosomes occurs in

How many meiotic divisions are required to produce 50 wheat grains?

A typical eukaryotic cell cycle is illustrated by human cells in culture. These cells divide once in approximately every

Choose incorrect statement with respect to cell cycle

Choose the correct sequence with respect to  different phases of cell cycle

Human nerve cells do not divide after birth and they remain throughout their life in which phase of cell cycle?

Various phases of cell cycle are controlled by

Read the following four statements 1, 2, 3 & 4 and select the right option having both correct statements.
1. First two stages of prophase I are relatively short lived compared to pachytene
2. Meiosis II is initiated immediately after karyokinesis of meiosis I
3. Meiosis increases the genetic variability in the population of organisms from one generation to the next
4. In plants, miotic cell division is only seen in diploid cells
1. 2 & 3                                  2. 3 & 4
3. 1 & 3                                  4. 2 & 4

Nuclear envelope, nucleolus, endoplasmic reticulum and golgi complex disappear from a dividing cell at the

Amount of DNA and Number of chromosomes in G₂ phase of cell cycle would be

Exchange of genetic material between non-sister chromatids of homologous chromosomes in pachytene stage is facilitated by

Plant cells do not divided their cytoplasm by forming a furrow in cell membrane like animal cells rather they divide by cell plate because

A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as get the best possible resolution -
1. Red 
2. Green 
3. Yellow 
4.  Blue

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non- living matter -
1. Larva cound appear in decaying organic matter
2. Meat was not spoiled, when heated and kept sealed in a vessel
3. microbes did not appear in stored meat
4. Microbes appeared form unsterilized organic matter

Protein synthesis in an animal cell occurs -
1. On ribosomes presents in cytoplasm as well as in mitochondria
2. On ribosomes present in the nucleolus as well as in cytoplasm
3. Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
4. Only on the ribosomes present in cytosol

Centromere is required for -
1. Movement of chromosomes towards poles
2. Cytoplasmic cleavage
3. Crossing over
4. Transcription

According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements are incorrect -
1. Proteins can also undergo flip-flop movements in the lipid bilayer
2. Many proteins remain completely embedded within the lipid bilayer
3. Proteins in cell membranes can travel within the lipid bilayer
4. Proteins can remain confined within certain domains of the membranes

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell -
1. During telophase
2. During S-phase
3. During G-2 stage of prophase
4. During entire prophase

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is -
1. Endoplasmic Reticulum
2. Lysosome
3. Mitochondria
4. Chloroplast

The number of correct statements amongst the given statements is:
I. Yeast can progress through the cell cycle in only about 90 minutes.
II. The interphase lasts more than 95% of the duration of the cell cycle.
III. During G1 phase the cell is metabolically active, continuously grows and replicates its DNA.
IV. Cells in G0 phase remain metabolically active bit no longer proliferate unless called to do so
V. In animals, mitotic cell division is seen only in the diploid somatic cells.
 1  2       
 2. 3
 3. 4       
 4. 5

What stage of mitosis is shown in the diagram given below?
                         
1. Late prophase     
2. Transition to metaphase
3. Anaphase           
4. Early telophase

In the given diagram of the transverse section of the gut, the longitudinal muscles are represented by the letter:
             
          1. A               
          2. B
          3. C               
          4. D

Consider the following four statements (I- IV) related to cell cycle, and select the correct option stating them as true (T) and false (F)
I. Cell growth in terms of cytoplasmic increase is a continuous process.
II. Interphase is the phase of actual cell division.
III. The number of chromosomes doubles in S-phase.
IV. The cell that do not divide further exits G1-phase to enter a metabolically inactive stage.
Options :
         I    II    III    IV
1.      T    F     F      F
2.      F    T     T     T
3.      F    F     T     T
4.      T    F     F     T

The spherical structures present in the nculeoplasm
1.  Has contents continuous with rest of the ncueloplasm.
2. Is a membrane bound structure.
3. Is a site of active messenger RNA synthesis.
4. Are smaller and more numerous in cells actively carrying out protein synthesis.

The microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes in
1. Metaphase - I 
2. Prophase - I
3. Metaphase 
4. Metaphase - II

Mark the mismatched pair :
1. Plastids Found in plant cells and in euglenoids.
2. Golgi apparatus Site of formation of glycoproteins and glycolipids.
3. Nucleus During interphase it has highly extended and elaboratenucleoprotien fibres.
4. Centriole Microtubular organization is referred to as the 9 + 2 and it forms basal body of cilia and flagella.

Which of the following statement is not correct?
1. Satellite DNA normally do not code for any protein but they form a large portion of human genome.
2. Satellite DNA shows high degree of polymorphism and forms basis of DNA finger printing.
3. Satellite DNA is widely used as identification tool in forensic science.
4. Satellite DNA is not transmitted as mendeliun trait from parent to progeny.

Satellite DNA is classified into many types on the basis of ?
1. Base composition.
2. Length of segment.
3. Number of repetitive units.
4. All the above.

Following are four statements, two of them have certain mistakes
(i) Few chromosomes have dark-staining secondary constrictions at constant location, known as satellite.
(ii) Microbodies are membrane bound small vesicles which contains various enzymes, found only in plant cells.
(iii) Movement of RNA and protein through nuclear pore is bidirectional.
(iv) Cilia help in movement of cell or surrounding fluid, whereas flagella causes movement of cell.
Two statements with mistakes are
1. (i) and (ii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv).

Which of the following is not matched correctly
1. Mitochondria – Divide by fission
2. Elaioplast – Seeds oils and fats
3. Contractile vacuole – Engulfing the food particles
4. Inclusion bodies – not bounded by membrane.

The option incorrect for cytokinesis of plant cell is?
1. Wall formation starts at the periphery of the cell and grows inward.
2. The formation of the new cell wall begins with the formation of a simple precursor.
3. Cell-plate represents the middle lamella between the walls of two adjacent cells.
4. At the time of cytoplasmic division, organelles like mitochondria and plastids get distributed between the two daughter cells.

Which of the following statement regarding cell membrane is incorrect?
1. In human beings, the membrane of the erythrocyte has approximately 52 per cent protein and 40 per cent lipids.
2. The lipid component of the membrane mainly consists of phosphoglycerides.
3. Depending on the ease of extraction, membrane proteins can be classified as integral or peripheral.
4. Lipids are arranged within the membrane with the polar head towards the outer sides and the hydrophilic tails towards the inner part.

During what stage of the cell cycle would you expect to have the lowest amount of cellular growth and synthesis taking place?
1. The S phase
2. The M phase
3. The G1 phase
4. The G2 phase

How many chromosomes are present in a human somatic cell during the G2 phase of the cell cycle?
1. 23
2. 46
3. 69
4. 92

A cell undergoing mitosis contains 16 chromosomes lined up at the metaphase plate. How many total chromatids will each of the daughter cell receive after the correct completion of the cell division?
1. 4
2. 8
3. 16
4. 32

Mark the incorrect statement with respect to semi-autonomous organelles.
1.  They are capable of self duplication.
2.  They have circular ds DNA.
3. They can synthesize some of their proteins.
4. They have low GC content.

Which of the following statements is incorrect?
1.  Microfilaments are long, thin and branch structures of dynein protein.
2.  80S ribosomes are attached to RER through ribophorins.
3.  Chloroplasts and mitochondria are believed to be bacterial endosymbionts.
4.  Fungal cell wall is made up of polymer of N-acetyl glucosamine units.

Initiation of the assembly of mitotic spindle and the complete disintegration of the nuclear envelope can be observed in respectively
1.  Prophase and anaphase I.
2.  Metaphase and telophase.
3.  Prophase and metaphase.
4.  Metaphase and metaphase-I.

During cell cycle, events are under
1. Genetic control
2. Metabolic control
3. Cytoplasmic control
4. Mitochondrial control

For recombination in meiosis, which of  the following is not correct?
1. Occur between non sister chromatids.
2. Homolohous chromosomes are involved.
3. Non homolohous chromosomes are involved.
4. Enzyme recombinase is involved.

Which of the following does not characterize mitotic prophase?
1.  Chromosomal material condensation
2.  Initiation of assembly of mitotic spindle
3.  Nuclear envelope breakdown at the beginning
4.  Nucleolus disappears by the end

Identify the incorrectly matched pair:
        Meiosis stage                     Event
1.  Pachytene                             Bivalents clearly visible as tetrads
2.  Diakinesis                             Terminalization of chiasmata
3.  Anaphase I                           Splitting of centromere
4. Interkinesis                            No DNA replication