Cell Structure Past Paper PDF

C crifications  10 A photomicrograph of a tissue is accompanied by a scale bar which represents 1 µm. The scale bar is 10 mm long. What is the magnification of this photomicrograph? A x 10 B x 1 000 C x 10 000 D x 1 000 000 11 Many fresh water animals possess vacuole...

C crifications  10 A photomicrograph of a tissue is accompanied by a scale bar which represents 1 µm. The scale bar is 10 mm long. What is the magnification of this photomicrograph? A x 10 B x 1 000 C x 10 000 D x 1 000 000 11 Many fresh water animals possess vacuoles which contract regularly, expelling excess - water. Why do plants living in fresh water not require such vacuoles? A plant cell sap has the same water potential as pure water - B plant cell walls are impermeable to water · jo C water movement into plants is controlled by their roots. D plant cell walls restrict entry of water into turgid cells 12 The table gives descriptions of four membranous structures in a cell. Which structure is correctly matched with its function? structure function A an extensive network of tubes and sacs; each tube and lipid synthesis sac bounded by a single membrane B a spherical sac bounded by a single protein synthesis C a sac bounded by two membranes, the inner highly packaging of proteins folded D a stack of elongated, curved sacs; each sac bounded by photosynthesis a single membrane 13 A severe inherited condition arises from the failure to produce an enzyme that breaks down glycoproteins in cells. The condition can be diagnosed from an electron micrograph of a patient’s cell. Which abnormality would be observed in these cells? - I A An incomplete chromosome due to lack of a gene - · B Larger lysosomes due to accumulation of glycoprotein jo C Less endoplasmic reticulum due to a reduction in protein synthesis D Thinner cell surface membrane due to lack of glycoprotein 14 - A student is asked to study two photographs, taken at the same magnification, of a palisade mesophyll cell, one using a high quality light microscope and the other using an electron microscope. The student observed 1 the cisternae of the Golgi apparatus 2 the grana in the chloroplasts 3 the two membranes of the nuclear envelope 4 the vacuole enclosed by a tonoplast Which features can be seen because of the higher resolution of the electron microscope? A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4 3 # - I - · jo  - I - · jo protein (ribosome) - · jo  because it consists of Organ more than one type of tissue · , 1. Endothelium 2. Smooth muscle +issue connective tissue elastic tissue. 3 Fibrous tissue nervous tissue 4. Blood blood (from heart to It functions to transport (oxygenated) body cells ( ·