Cell Biology and Organisation

Question 1:State arrangement of sequence in the organisation of cells in a multicellular organism. Answer:Cell –> Tissue –> Organ –> System –> Multicellular organism Question 2:The skin is the largest organ in the body. Why is skin classified as an organ? Answer:Skin is classified as an organ because skin is made up of epithelial tissues, … Read more

Question 1:State the components of cells found in high density in cells that secrete protein products. Answer:Rough endoplasmic reticulum, ribosomes and Golgi apparatus. Question 2:Briefly describe the structure and function of the nerve tissue. Answer:A nerve tissue is made of cell body and nerve fibres that are called dendrites and axons. Nerve tissues coordinate and … Read more

Question 1:What is the function of the contractile vacuole in a Paramecium sp.? Answer:Contractile vacuoles are involved in osmoregulation. Question 2:How does the Amoeba sp. move? Answer:Amoeba sp. moves by extending its pseudopodium (false feet). This is followed by cytoplasmic streaming into the extended pseudopodium. Question 3:How does the Amoeba sp. reproduce when the environment … Read more

Question 1:State one structural difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum. Answer:Rough endoplasmic reticulum has ribosomes attached it whereas smooth endoplasmic reticulum does not have any ribosomes attached to it. Question 2:Why is the use of an electron microscope important in studying cells? Answer:Light microscope usually has a magnification of 1000x. … Read more

Question 1:Diagram below shows four levels of cell organization in humans.(a) Complete Table below by naming Level 2 and Level 3. [2 marks](b)(i) The cells undergo process P to become specific cells that perform a specific function.Name process P. [1 mark](ii) What is the function of the structure in level 2? [1 mark](iii) The structure … Read more