CORE BIOLOGY PRACTICALS You will need to know these practicals as the exam board may ask you questions based on them. Below is a summary of each one. Name of practical and independent & dependent variables Effect of caffeine on Daphnia heart rate Independent: caffeine concentration Dependent: heart rate of Daphnia Measuring the content of Vitamin C in fruit juice Independent: fruit juice Dependent: volume of juice required to decolourise 1cm3 of DCPIP The effect of temperature on cell membranes
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soluble bases‚ emulsifying bases and vegetable oils. The medicaments are dispersed throughout the solution by the bases. Petroleum jelly‚ which is one of the major components in producing ointments‚ is a semi-solid mixture of hydrocarbons (with carbon numbers mainly higher than 25)‚ originally promoted as a topical ointment for its healing properties. After petroleum jelly became a medicine chest staple‚ consumers began to use it for myriad ailments and cosmetic purposes‚ including toenail fungus‚ male
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materials used in this study were Duranta leaves‚ Fusarium sp.‚ petri dish for the containment where cultures of Fusarium sp. were grown. Ethanol for extracting the Duranta leaves. Erlenmeyer flask for containment of the concentrations. Potato Dextrose Agar (PDA) served as the food of the fungus. Gloves‚ face masks and lab gown were also needed for laboratory safety rules. Preparation of Different Concentrations and Treatments Fresh Duranta leaves were collected for extraction. Leaves of Duranta
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DETERGENT PESTICIDE DISINFFECTANT PRESERVATIVES ADDITIVES MEDICINES BLEACH PETROLEUM JELLY ALUMINUM FOIL CORN STARCH NAME.ROMELYN.VILLAMAYOR YR&SEC; IV-EDISON TEACHER; MRS. SALUDES NAME:ERICA E. VILLAMAYOR GR&SEC: VI-MALINIS TEACHER:MR:PENIDA A detergent is a surfactant or a mixture of surfactants with "cleaning properties in dilute solutions."[1] These substances are usually alkylbenzenesulfonates
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especially in its merchandising department. We currently offer over 300 varieties of confectionery to our customers‚ including some of the world-renowned brands in the industry. Some of the major brands we carry are Wonka‚ Jelly Belly; the world’s number one gourmet jelly bean‚ Russel Stover; number one sugar-free confectionary in the U.S. and the classic‚ but delicious Roca products from Brown and Hailey. Candy Corner’s growth and expertise in management is evidenced by its continuous expansion
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to combat bacteria. Hypothesis If bacteria is exposed to garlic‚ then the garlic will to abolish the Escherichia coli‚ because the Escherichia coli (E. coli) is usually a weak bacteria. Procedure Have three petri dishes prepared with blood agar‚ and three test tubes with 100 milliliters of milk. Label three test tubes‚ “A‚” “B‚” and “C.” With a toothpick‚ add a small amount of the E. coli specimen to tube “B"; shake the test tube to mix throughly. For test tube “C‚” add the same amount
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Taste discrimination in young and old Drosophila melanogaster Introduction The ability to discriminate taste is critical for the survival and nutrition of an organism (Sellier et al.‚ 2010‚ Gordesky-Gold et al.‚ 2008). Many animals rely on their taste organs to detect and discriminate various types of taste such as sweet or bitter (Weiss et al.‚ 2011). When these organs come in contact with a food source‚ signals are sent to taste receptor cells. The activation of certain taste receptor cells by
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ways to go about resolving ED symptoms. It is best to change your lifestyle and gradually remove the conditions that produce ED. Sometimes‚ it is important to perform sexually to keep relationships intact and feel confident about life. Kamagra oral jelly can truly help in such cases and provide immediate relief from erectile dysfunction. What Does This Drug Contain This wonderful drug contains sildenafil citrate which is the active ingredient. This is the first chemical which was identified by the
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unknown organisms provided by the instructor in a nutrient broth. It is only known that the two organisms are from vomit; one is gram-positive and the other is gram-negative. It is necessary to first separate the two organisms by inoculating a nutrient agar plate using the streak-plate method. The initial streak-plate procedure was performed and placed in the incubator at 37◦C for 24-48 hours. Upon observing the growth on this plate‚ it is fairly obvious that one of the organisms is Serratia marcescens
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An agar plate is a Petri dish that contains a combination of agar and nutrients that help microorganisms grow. The proper method of setting microorganisms on an agar plate is know as “streaking”. In order to streak‚ the microorganisms are placed on a sterile swab or metal wire‚ which is then dragged lightly against the agar solution‚ leaving behind the microorganisms. The amount of organisms is greatest at the beginning
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