12th class (Fsc) Biology unit 7 MCQs
26. Tissue culture and cloning seek help through:
a. Meiosis
b. Mitosis
c. Karyokinesis
d. Endomitosis
27. During cell division, the nuclear division is called:
a. Karyotype
b. Cytokinesis
c. Plasmolysis
d. Karyokinesis
28. Karyokinesis involves division of nucleus and cytokinesis refers to:
a. Division of centromere
b. Division of whole cell
c. Division of cell wall
d. Division of cytoplasm
29. The number of sets of microtubules originate from each pair of centriole is:
a. 05
b. 03
c. 06
d. 04
30. Chromatin network is visible during:
a. Metaphase
b. Interphase
c. Anaphase
d. Prophase
31. Contractile ring in cytokinesis is formed by:
a. Keratin
b. Tubulin
c. Cyclin
d. Actin and myosin
32. Cancer occurs due to error in:
a. Binary fission
b. Mitosis
c. Budding
d. Meiosis
33. Phragmoplast is formed by vericles originated from:
a. Chloroplast
b. Endoplasmic Reticulum
c. Mitochondria
d. Golgi Complex
34. Microtubules are composed of protein, tubulin and traces of:
a. Glycolipid
b. RNA
c. Phospholipid
d. DNA
35. Microtubules are composed of:
a. Hemoglobin
b. Tubulin
c. Adrenaline
d. Insulin
36. Which of the following behaves like normal cells:
a. Benign tumor
b. Malignant tumor
c. Both
d. Apoptosis
37. The tumor which is localized and not transferred to other body parts:
a. Apoptosis
b. Malignant
c. Necrosis
d. Benign
38. Which tumor is delocalized or has branches other than site of origin:
a. Benign
b. Malignant
c. Both
d. Apoptosis
39. Cancer is caused mainly by mutation in:
a. Sex cells
b. Somatic cells
c. Reproductive cells
d. Malignant cell
40. The spread of tumor cells and establishment of secondary areas of growth is called:
a. Metastasis
b. Necrosis
c. Epigenesis
d. Apoptosis
41. The presence of invading ells other than normal tissue is an indication of:
a. Mutation
b. Melatoma
c. Malignancy
d. Abnormality
42. An unwanted clone of cells and establishment of secondary areas of growth is called:
a. Lump
b. Tumor
c. Swelling
d. Growth
43. The pairing of homologous chromosomes is completed in ………:
a. Pachytene
b. Leptotene
c. Anaphase
d. Zygotene
44. Type of cell division in which number of chromosomes is reduced to half in daughter cells is called:
a. Budding
b. Mitosis
c. Binary fission
d. Meiosis
45. Which one sub-stage of prophase-I of meiosis-I lasts for days, week or even years?
a. Pachytene
b. Zygotene
c. Diplotene
d. Leptotene
46. In which stage of meiosis crossing over occur?
a. Pachytene
b. Leptotene
c. Anaphase
d. Zygotene
47. The actual reduction division is:
a. Mitosis
b. Meiosis-I
c. Cytokinesis
d. Meiosis-II
48. The prophase stage in which the chromosomes become visible shorten and thick:
a. Diplotene
b. Leptotene
c. Pachytene
d. Zygotene
49. In which stage of meiosis the paired chromosomes repel each other and begin to separate?
a. Diplotene
b. Leptotene
c. Pachytene
d. Zygotene
50. The most critical phase of mitosis, which ensures equal distribution of chromatids in the daughter cell is:
a. Prophase
b. Anaphase
c. Telophase
d. Metaphase