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Questions and Answers

Who first observed cell division

Walter Flemming

First cell division was observed in

Sea salamander

Cell cycle is proposed by

Howard and pelc

Cyclin compound gives external stimulation in cell cycle

<p>False</p> Signup and view all the answers

__ produces __ to increase the number of RBC in bone marrow

<p>Kidney, erythropoietin</p> Signup and view all the answers

The nucleus in the cell In interphase is called __ nucleus

<p>Metabolic</p> Signup and view all the answers

Components of DNA replication are produced in which phase

<p>G1</p> Signup and view all the answers

DNA Replication is completed in S phase

<p>True</p> Signup and view all the answers

Microtubule forming components are synthesized in which phase

<p>G2</p> Signup and view all the answers

Which cyclin compound takes the cell from one phase to another

<p>D</p> Signup and view all the answers

Cyclin-E Completes everything necessary for mitosis

<p>False</p> Signup and view all the answers

How long mitotic phase of the cell cycle in mammalian cells last

<p>1-1.5 hours</p> Signup and view all the answers

Study Notes

Observing Cell Division

  • Robert Hooke first observed cell division in the 17th century.
  • Rudolf Virchow further proposed the concept of cell division, stating that all cells come from pre-existing cells.

Cell Cycle

  • The cell cycle is a series of events that take place in a cell leading to its growth and division into two daughter cells.
  • Howard and Pelc proposed the cell cycle in 1953.
  • Cyclin compounds play a critical role in regulating the cell cycle, acting as external stimuli, particularly cyclin B, and helping to move the cell through its phases.

Erythropoiesis

  • Erythropoietin (EPO) hormone is produced by the kidneys to stimulate the production of red blood cells (RBCs) in the bone marrow.

Interphase

  • The stage during which the cell grows and copies its DNA before entering mitosis.
  • The nucleus in interphase is called the interphase nucleus.
  • The interphase is further subdivided into three stages, G1, S, and G2, each performing different functions.
  • The components of DNA replication, such as enzymes and nucleotides, are produced during the G1 phase.
  • DNA replication is completed in the S phase.
  • The essential components for microtubule formation, such as tubulin, are synthesized during the G2 phase.

Cyclin Compounds and Mitosis

  • Cyclin E is a specific cyclin compound that helps complete the necessary steps for mitosis.
  • Cyclin Dependent Kinases (CDKs) are a family of enzymes that play an essential role in regulating the cell cycle and are activated by cyclin compounds.

Mitotic Phase

  • The mitotic phase of the cell cycle in mammalian cells typically lasts for a short duration of about 1-2 hours.

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Cell Division: Amitosis, cell cycle

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