Question 4 :
An acid soluble compounds formed by phosphorylation of nucleoside is called.

Question 5 :
A metaphase, chromosomes are attached to the spindle fibres by their

Question 6 :
Which one of the following statements is correct, with reference to enzymes ?

Question 7 :
The main area of various types of activities of a cell is

Question 10 :
At what phase of meiosis are there two cells, each with separated sister chromatids that have been moved to opposite spindle poles?

Question 11 :
Which phase comes in between the G₁ and G₂ phase of cell cycle

Question 12 :
The chromosomes in which centromere is situated close to one end are

Question 16 :
Match the stages of meiosis in column I to their characteristic feature in column II and select the correct option using the codes given below. <table><th>Column I</th><th>Column II</th> <tr><td>A. Pachytene</td><td>(i) Pairing of homologous chromosomes</td></tr> <tr><td>B. Meta phase I</td><td>(ii) Terminalisation of chiasmata</td></tr> <tr><td>C. Diakinesis</td><td>(iii) Crossing-over takes place</td></tr> <tr><td>D. Zygotene</td><td>(iv) Chromosomes align at equatorial plate</td></tr></table>

Question 18 :
Which one of the following structures is an organelle within an organelle?

Question 19 :
Assertion : Coenzymes are also called prosthetic groups.<br>Reason : Coenzymes and prosthetic groups are cofactors.

Question 20 :
<p>Crossing over that results in genetic recombination in higher organisms occurs between</p>

Question 21 :
The best stage to count the number of chromosomes during mitosis is or structure of chromosomes can be best seen at<br>Or<br>In which phase of mitosis the chromosomes are arranged around the equator of the spindle

Question 22 :
Match column-I with column-II and choose the correct option. <table><tr><td>Column-I(Chromosome)</td><td>Column-II (Position of Centromere)</td></tr> <tr><td>A. Metacentric</td><td>I. At the tip</td></tr> <tr><td>B. Submetacentric</td><td>II. Almost near the tip</td></tr> <tr><td>C. Acrocentric</td><td>III. At the middle</td></tr> <tr><td>D. Telocentric</td><td>IV. Slightly away from the middle</td></tr></table>

Question 23 :
<p>What is the approximate percentage duration of cell cycle that comes under interphase in humans?</p>

Question 24 :
CO₂ + H₂O → H₂CO₃ (Carbonic acid) <br>Which one is incorrect about the above reaction?

Question 25 :
The centromere is situated close to its ends and forming one extremely short and one very long arm in

Question 26 :
Cellular structures which disappear during late prophase and reappear during anaphase are

Question 29 :
What is the stage of mitosis in which chromosomes are arranged on the equator of spindle?

Question 32 :
When dividing cells are examined under a light microscope, chromosomes first become visible during -

Question 35 :
Assertion : Mitochondria and chloroplasts are semiautonomous organelles.<br>Reason : They are formed by division of pre-existing organelles as well as contain DNA but lack protein synthesizing machinery

Question 41 :
Which one of the following is the best stage to observe the shape, size and number of chromosomes in a cell?