Microbiology Lab Quiz #2 Study Guide Exercise 9 -- The Gram Stain Compare and contrast simple and differential staining techniques. Simple Staining Simple staining is useful in determining the basic morphology of an organism. Simple staining involves only one reagent i.e. crystal violet‚ basic fuchsin‚ or methylene blue. Simple dyes used to stain bacteria have a positive charge cationic (+)‚ therefore‚ they are attracted to the bacteria that are usually negatively charged anionic (-) Depends
Free Bacteria Staining Gram staining
occurs‚ the plasma membrane ruptures allowing the betacyanin pigment to leak out. This is why we would expect to see a higher concentration of betacyanin leakage at higher temperatures. As the results of this lab indicate‚ as temperature increases‚ the plasma membranes of beet root cells (that were immersed in high temperatures of water) became damaged‚ allowing for more betacyanin to leak out resulting in a higher concentration of the pigment. What was unexpected‚ however‚ was that at -5ºC‚ the amount
Premium Cell membrane Gas Leak
another. Skin color is a known as a polygenic gene that is a consequence of the difference in alleles of more than one gene. There are tons of factors that to give skin its color. Melanin is the most important of these factors. This is the dark pigment that determines the lightness darkness of the skin. This is responsible for the varies of tan‚ brown‚ and black skin. Melanocytes produce Melanin‚ this happens in the bottom layer of the skin. Weirdly‚ all humans have about the same number of melanocytes
Premium Human skin color Sun tanning Ultraviolet
Exp.11) Identification of unknown ketones. Introduction: Given five samples of a known ketone derivative‚ the purpose of this experiment is to identify which unknown ketone derivative corresponds to the five known samples. In other words‚ using specific methods of compound detection‚ it is possible to match an unknown compound with a known compound because similar compounds will display similar characteristics. In this experiment‚ identification of the unknown ketone is accomplished through thin
Premium
different roles‚ these include protecting the cell‚ allowing cell recognition‚ allow transport in and out of the cell and also allowing cell or organelle motility. A beetroot cell has a large vacuole which contains a red pigment called anthocyanin‚ The cell membrane stops this pigment from leaking out of the vacuole. When the cell membrane becomes damaged or stressed the membrane breaks causing the vacuole to release the anthocyanin. Aim: To investigate the effect of different temperatures on the
Premium Cell membrane Cell Protein
there are actually several treatment options available (Amer et al.‚ 2015). Aside from using makeup to coverup the discolored skin‚ there are treatments which aim to restore normal skin color and also an option to remove pigment from unaffected skin. In regard to restoration of pigment‚ treatment either takes the form of spot treatment or whole body treatment. There are two topical spot treatments as well as mini grafting. The spot treatments are considerable less invasive but also less predictable
Premium Medicine Immune system Cancer
damaging to the human body‚ especially the skin. To solve this problem‚ evolution created a skin tone that was already dark in areas with strong sun exposure to protect the skin from the dangerous rays that came from the sun. Melanin is the skin’s brown pigment that acts as a protectant for the skin against the sun’s rays. Of course‚ it doesn’t completely shield the skin because Vitamin D still needs to get into the body. When people tan‚
Premium Ultraviolet Sunscreen Sun tanning
AP Biology Unit Test Review Guide Plants Obtaining and Transporting Nutrients Pigments and photosynthesis 1. Distinguish between the strategies used by autotrophs and heterotrophs to obtain free energy for cellular processes. In other words‚ how and in what form does each capture and store that energy? 2. Explain how photosynthesis differs in eukaryotic organisms (with organelles such as chloroplasts) and in prokaryotic organisms (single-celled‚ no organelles). 3. How does a metabolic
Premium Photosynthesis Chlorophyll Plant
The Cave of Lascaux and Cave Art Cave paintings might possibly be the oldest known form of communication that exists today. Cave paintings date back to a period of time called the Paleolithic Age. The Paleolithic Age took place from 40‚000 to 10‚000 B.C. Prehistoric Age is divided into three parts: Paleolithic being the earliest‚ Mesolithic being the middle at 10‚000 B.C. and Neolithic Age being the latest at 8‚000 B.C. During the Paleolithic Age it is believed that the cave paintings at Lascaux
Premium Cave painting
mass obtained in the latter. In this experiment we could also observe that the colour of the water in which the beetroot were put turned purple. This happened because the purple pigment in the beetroot diffused from the vegetable where there was a high concentration of colour into the water where there was no pigment at all. It was expected that the purple colour
Premium Concentration Purple Chemistry