• A level biology

    What is the function of Golgi body?

    The Golgi body is actually a pile or stack of membranous structures called cisternae. The numbers of cisternae in a single stack vary between 6-8. In some protists, however, the number could extend up to 60. The Golgi bodies are found in both plant & animal cells. The cisternae of Golgi body have four structural components i.e., cis-Golgi, endo-Golgi, medial-Golgi and trans-Golgi. The vesicles extending from endoplasmic reticulum fuse with the network. These vesicles then enter the stacks of Golgi body and finally reach the trans-Golgi. The different regions of Golgi apparatus contain different types of enzymes. These enzymes have certain specific tasks assigned to them. Vesicles leave the Golgi…

  • Biochemistry,  Q & A

    Q & A ON CELL RESPIRATION

    1. How do cells obtain the energy they need to function? Cells obtain energy for their metabolic reactions from breaking down organic molecules with a high energy content. This energy is mostly stored as ATP molecules. The process of obtaining energy in order to produce ATP molecules is called cellular respiration. 2. What compound is phosphorylated for ATP formation? What is the resulting compound when ATP releases energy? ATP, or adenosine triphosphate, is formed after the binding of one phosphate molecule (phosphorylation) to one ADP (adenosine diphosphate) molecule. This is a process that stores energy in the produced ATP molecule. When ATP provides energy to the cellular metabolism, it releases…

  • Biology,  Q & A,  Zoology

    Explain the excretory system in insects?

    Excretion Excretion is the process whereby an organism eliminates metabolic wastes and unwanted chemicals from its system. Metabolism is  the sum total of all the chemical reactions occurring in the cells and body. Some products of these metabolic reactions are toxic  and so must be processed or eliminated from the body. Others are simply materials that are present in excess and so must be  eliminated as waste. The process of excretion is quite different to defecation, which is the removal of undigested food wastes from  the gut. However, the gut of many animals also has a role in excretion as some materials may be excreted into the gut and  eliminated…

  • Genetics,  Q & A

    Q & A ON CELL CYCLE AND CELL DIVISION

    Q 1. Define cell cycle Ans. The sequence of events by which cell duplicates its genome, synthesis of other constituents of the cell and eventually divides into two daughters cell. Q2. Name the phases of cell cycle Ans. A) Interphase B) M Phase Q3. What is the G1phase of the interphase? Ans. The G1 phase Corresponds to interval between mitosis & initiation of DNA replication. Q4. Which phase follows the S phase in the cell cycle? Ans. G2 Phase Q5. What is mitosis? Ans. Cell divides equally to produce identical daughter cell so that they receive an equal number of chromosomes as that of its parents cell.  Q6. What is meiosis? Ans. It…

  • Q & A

    Q & A ON REPRODUCTION IN ORGANISMS

    Q1. What is life span? Ans: Life span is the period from birth to natural death of an organism. Q2. Define clone. Ans: The individuals that are morphologically and genetically similar to the parent are called clone. Q3. Mention the different means/ methods of asexual reproduction with example. Ans:  Cell division – Protista, Monera Binary fission – Amoeba, Paramecium Budding – Yeast Zoospores (microscopic motile endogenous spores) – aquatic fungi, chlamydomonas Conidia (microscopic immotile exogenous spores)- pencillium External buds – hydra Internal buds like gemmules – sponges (spongilla) Q4.Unicellular organisms are immortal. Justify. Ans: Single celled organisms like amoeba & bacteria reproduce by cell division and there is no natural…

  • Biochemistry,  Q & A

    Q & A ON WATER AND MINERAL SALT

    Q1.  What is the approximate percentage (in mass) of water in the human body? Is this percentage expected to be larger in the adult or in the old individual?  Ans: Approximately 65% of the human individual mass is water. The brain, for example, has around 90% of water in mass, the muscles, 85%, and the bones have between 25% and 40% of water. Younger adult individuals have proportionally more water in mass than older individuals. Q2.  What are the main biological functions of water? Ans: Water is the fundamental solvent for chemical reactions of living beings; it is the main means of substance transportation in the cell and between cells…

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