Cell Biology-Cell Division Mitosis and Meiosis [IFS (Forest Services) Zoology]: Questions 1 - 7 of 9

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Question 1

Appeared in Year: 2018 (IAS)

Describe in Detail Subjective▾

Describe the role of protein kinases in the regulation of cell cycle. Add a note on the importance of check points.

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Explanation

Introduction to Protein Kinases

Protein kinases, also called PTKs are the crucial enzymes that regulate the protein activities biologically using ATP as a source of phosphate for the phosphorylation of various amino acids like serine or threonine and inducing conformational changes in inactive protein to convert it into its active format.

Cyclin and …

… (542 more words, 18 figures) …

Question 2

Describe in Detail Subjective▾

Explain the process of oogenesis. Discuss the importance of meiotic arrest during oogenesis.

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Explanation

Ovaries

  • Ovaries are located in the pelvic region, on the side walls of posterior pelvic cavity.
  • It is the primary organ that produce female gamete ova (ovum) and various steroid hormones like LH- luteinizing hormone, FSH- Follicle stimulating hormone, ACTH- Adreno-Corticotropic hormone.
  • Ovaries are attached to the uterus by ovarian filaments.
  • Each ovar…

… (351 more words, 34 figures) …

Question 3

Describe in Detail Subjective▾

Describe cell cycle?

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Explanation

  • Based on cellular activity the cell cycle is divided into two phases.
    • M phase (mitotic phase)
    • Inter phase.
  • In mitotic phase mitosis and cytokinesis takes place but in interphase cell growth and diverse metabolic activities takes place.
Describe Cell Cycle
  • Howard and Pelc (1953) have divided cell cycle into four distinct phases: phas…

… (179 more words, 8 figures) …

Question 4

Appeared in Year: 2020

Describe in Detail Subjective▾

Describe with well-labelled diagram, the stages involved in meiotic prophase. (Paper 1)

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Explanation

  • Prophase is basically the first phase of meiosis.
  • It is much more complicated than the prophase of mitosis. So, the general process that is occurring in case of mitosis prophase is quite different from the prophase that is happening in case of meiosis.
  • Basically, it is divided into 5 sub-phases.
  • Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis…

… (146 more words, 11 figures) …

Question 5

Appeared in Year: 2022 (IAS)

Describe in Detail Subjective▾

What is rough endoplasmic reticulum (RER) ? Describe in detail the various modifications of secretory proteins occurring in the lumen of RER. (Paper 2)

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Explanation

  • The network of flattened sacs or tubules known as the rough endoplasmic reticulum (RER) has ribosomes adhered to its surface. It is a specific organelle that can be found in eukaryotic cells, especially in those that are involved in protein synthesis and secretion, like those in the pancreas, liver, and immune system.
  • The RER՚s surface ribosomes are…

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Question 6

Appeared in Year: 2021 (IAS)

Describe in Detail Subjective▾

Write your answer in about 150 words for each of the following: (Paper 2)

What is primordial germ cell? With the help of suitable diagram, discuss the process of oogenesis.

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Explanation

The precursor cell known as primordial germ cells (PGCs) is what develops into the gametes, or egg and sperm cells. When a human embryo is developing, PGCs move from the yolk sac to the genital ridge. They then differentiate into either spermatogonia or oogonia, which are the cells that will eventually become eggs or sperm.

The process by which fema…

… (216 more words, 3 figures) …

Question 7

Appeared in Year: 2021 (IAS)

Describe in Detail Subjective▾

Write your answer in about 150 words for each of the following: (Paper 2)

What is cell cycle? Draw an overview of molecular events during cell cycle. Discuss the role of protein kinases in the regulation of meiotic cell cycle. (20 Marks)

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Explanation

  • The cell cycle is the series of events that occur in a cell that led to its division and replication.
  • The cell cycle is divided into two main phases: interphase and mitosis. Interphase is the period between cell divisions and is divided into three phases: G1, S and G2.
  • Mitosis is the period of cell division, which is divided into two stages: mitosis …

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