molecules Ions Match each organism with the strategy it uses to maintain osmotic balance. Oak tree Surround the cells with a rigid wall that can withstand the pressure that builds up inside the cells dues to the inflow of water by osmosis. Paramecium Use contractile vacuoles to actively pump water out of the cells. Humans Surround the cells with an isotonic extracellular fluid. If 2 solutions have unequal concentrations of solutes‚ the solution with the higher solute concentration is called
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C. D. Cell membrane Selctputsel Cell wall Dinding ‚sel Nucleus i\‚hk/eus Cytoplasm Sitoplu.sntct Diagram3 Rajah 3 4. are Which of the following organism unicellular? unisel? organismovang beriktttnterupctkun Manakcrh tl III IV Paramecium Puruntusiutrt Yeast iis Hydra Hidru Spirogyra Spirogiru I II o n l y III shujct I andII only Idutr ILsahultt I andIV only u I rlurrII/ .suhuf I a n dI I t o n l y I duttIILsuhu.ju A. B. C. D. ILilrut sebelalr S A I N SJ ‚ I P - P M
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Paper 1 Section A |Terms with *‚ mark deduction for spelling error. | |Marks | |1 | |D→E→B→C→A |(2) | | | |(1) (1) | | |2 |(a) |During the favourable season more secondary xylem cells are formed and they are larger
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density of cells in a liquid. “Density of cells” means “the number of cells per unit volume of liquid”. For example‚ they might want to find out the density of red blood cells in blood plasma‚ the density of bacteria in milk‚ or the population of Paramecium sp. (a protozoan) in water from a pond. The simplest‚ most convenient and cheapest means of accurately determining the number of cells in a sample is to use a haemocytometer and a microscope. A haemocytometer is a specialised slide that has a counting
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Biology Honors Final Exam Review Study Guide A. Intro Unit * Characteristics of life (DR.CHARGE) * DNA * Directs protein synthesis * Reproduce * Divides in mitosis (asexual reproduction) * Cells * Homeostasis * The process by which cells maintain constant internal condition (water‚ temperature) * Adaptation (Evolution) * Respond to stimulus * Growth (Development) * Energy * Heterotroph: an organism that cannot synthesize its own food
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The theory of being able to make a genetic copy (a clone) of another animal has been around for quite a while. In this section as the title reads I will show the history of cloning. 400 million years B. C.- Plants have been cloning themselves since not to long (as far as the Earth is concerned) after their introduction to our planet. They send out runners that create an identical copy of the parent plant. 1938- Hans Spermann‚ of Germany‚ envisions what he calls the "fantastical experiment"
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Extra-chromosomal Inheritance 1.) Genetic factors that are located outside the chromosome: plasmagenes‚ plasmons‚ cytogens‚ plasmids. 2.) Plasmid inheritance implies: perpetuation through DNA Replication. 3.) Killer gene particulate material in Paramecium aurelia: kappa 4.) Mirabilis jalapa shows extrachromosomal inheritance in the ___________. When a pale male parent is crossed with a green female the result usually is __________. : chloroplast‚ green 5.) Hereditary mitochondrial diseases
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Cell Structure - Cell Organelles 1. What is cell theory? Cell theory asserts that the cell is the constituent unit of living beings. Before the discovery of the cell‚ it was not recognized that living beings were made of building blocks like cells. The cell theory is one of the basic theories of Biology. 2. Are there living beings without cells? Viruses are considered the only living beings that do not have cells. Viruses are constituted by genetic material (DNA or RNA) enwrapped by a protein
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1. Plant Nutrition Nine macronutrients of plants: C‚ H‚ N‚ O‚ P‚ S‚ K‚ Ca‚ Mg Components of soil: Horizon a (topsoil): humus‚ leaf litter‚ decaying matter Horizon b (middle): minerals but no humus Horizon c (bottom): rock Most common nutrient deficiencies: N‚ P‚ K 2. Transport of Water and Minerals in Xylem Xylem transports water and minerals from the roots to the leaves Plant cells include: cell wall‚ plasma membrane‚ nucleus‚ chloroplasts and central vacuole Soil to root Water is absorbed
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................ (Total 3 marks) 2. no two species can coexist in same niche; one is displaced / one survives; one species has an advantage over competitor / species compete with each other; description of (Gause’s) experiments with Paramecium; [3] 3. Outline the biological consequences of releasing raw sewage into a river. ............................................................................................................................................... .........
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