Tag: cell biology

The nucleus is the site for DNA replication and transcription. Translation is the process of synthesis of polypeptides by polymerization of amino acids on ribosomes using the mRNA triplets as a template. Ribosomes serve as the site of translation and the process takes place in the cytosol. ER is eukaryotic organelle with a network of tubules, vesicles and cisternae within the cells. Ribosomes are present on the surface of RER but not on SER. Golgi complex serves to modify and pack the proteins synthesized on ER by ribosomes.  The correct answer is C.  

Leucoplasts are a category of plastids that are colorless and non-pigmented, typically found in the non-photosynthetic tissues of plants. Chromoplasts contain pigments, and chloroplasts contain chlorophyll.

The terms cytoplasm and nucleoplasm were given by Strasburger in 1882. Cytoplasm is the bulk of protoplasm excluding nucleus and vacuoles. Cytoplasm is differentiated into a cytoplasmic matrix, cell organelles and cell inclusions. Nucleoplasm or nuclear sap or karyolymph or karyoplasma is a colloidal complex that fills the nucleus. Nucleoplasm contains the raw materials for the synthesis of DNA and RNA.

The nucleus is the main organelle which controls the activities of all the other organelles present in the eukaryotic cell. 

• The jelly-like semifluid complex of cytoplasm is called cytosol or cytoplasmic 

• In the eukaryotic cell, the cytosol is surrounded by the cell membrane and is part of the cytoplasm, which also comprises the mitochondria, plastids, and other organelles except nucleus. The cytosol is thus a liquid matrix around the organelles.
• So, the correct answer is 'Both B and C'.

Cnidocytes contain stinging structure known as nematocysts. Cnidocytes in tentacular region help in capturing the larger prey as their nematocytes discharge toxins into their prey.

Cytoplasm is the fluid which is present in the living cell. It lies between the cell membrane and the nuclear membrane. It consists of 80% water. It is a colorless liquid which holds the cell organelle and helps in intracellular and intercellular transport. The cellular process like glycolysis and the cell division occurs in the cytoplasm. So, the correct answer is option B.

• The gel part below the plasma membrane is ectoplasm.
  
• The cytoplasm of the cell can be divided into two i.e, ectoplasm and endoplasm.
• Ectoplasm or exoplasm is the outer, non-granulated gel-like part of the cytoplasm of the cell near to the plasma membrane.
• Whereas. the endoplasm is the inner granulated layer of the cytoplasm.
  
• So, the correct answer is 'Ectoplasm'.

• The main arena of various cellular activities of a cell occur is cytoplasm.
  
• Cytoplasm can be defined as a jellylike material present within the cell (inside the cell membrane) which surrounds the nucleus.
  
• All the cellular organelles such as mitochondria, the endoplasmic reticulum, and chloroplasts, are contained in the cytoplasm (all the cellular activities carried out here).
• So, the correct answer is 'Cytoplasm'.

Proteins required for nuclear function are synthesized in the cytoplasm by ribosomes and then transported into the nucleus through nuclear pores.