Arabidopsis Essay

This experiment, which was used to explore the Theory of Evolution created by Charles Darwin. The use of natural selection was apparent in the artificial modification of an organism's traits which aided in this investigation. Through this experiment the Wisconsin Fast Plant was used. It is a fast-growing organism developed to improve the resistance to disease in cruciferous plants. This plant aids scientist in the exploration of environmental effects on population due to the speed to which is matures and reproduces. Artificial selection was stimulated by the selection against plants with few hairs(trichomes). Trichomes create a wider variation which means it is polygenic. The plants that had only a few trichomes were

Exercise 3A is a study of mitosis. You will simulate the stages of mitosis by using chromosome models.You will use prepared slides of onion root tips to study plant mitosis and to calculate the relative duration of the phases of mitosis in the meristem of root tissue. Prepared slides of the whitefish blastula will be used to study mitosis in animal cells and to compare animal mitosis and plant mitosis.

The book Red Azalea written by Anchee Min is a true tale about her life and her upbringings. The author was raised in Shanghai and was brought up being taught under the influence of Mao and on the operas of Comrade Jiang Ching. She is a very intelligent girl in school, and she becomes the leader of the Little Red Guards because of her good grades and hard work in school, a communist party, but a school version. Anchee Min excels in school with her amazing speaking and writing skills, therefore her other party members decide that she is the right one to speak on their behalf. When she is told by a secretary of the party that she must speak against her teacher Autumn Leaves at first she doesn’t believe but she is then told that the teacher has written a journal about the students and how “Min is “educable”” she is very angry about this so accuses the teacher

John Steinbeck’s “The Chrysanthemums”, is a story about a woman struggling with strong inner feelings of loneliness and isolation. Elisa Allen is initially portrayed as a woman who overcompensates and whose tasks are far exceeded by her abilities. She appears content with her life and adores tending to her garden. However, a tinker briefly enters her life and through his power of persuasion and manipulation provides Elisa with hopes of change and excitement. He gives her the much needed attention she is so desperately looking for. As the story continues we learn that these hopes are crushed as we unravel the betrayal the tinker has bestowed upon Elisa. He exploits her and takes advantage of her hunger for company, aspirations, and

Roots support photosynthesis and respiration by absorbing minerals and water and by storing organic nutrients. They also anchor the plant. Some roots have mycorrhizae, which increase the surface area and therefore increase the absorption. The endodermis, which is the innermost layer of cells in the root cortex, surrounds the vascular cylinder. It is the passage of minerals from the cortex into the vascular tissue.

time and a home. In comparing the two men in this story it is simple

John Steinbeck’s, The Chrysanthemums, was published in 1938 in a book of short stories, entitled The Long Valley. The Chrysanthemums has been a rather powerful draw for scholars because of its wide gap for interpretations and analysis of its main protagonist character, Elisa Allen and also the unique descriptions used to portray the deeper meaning behind the setting of the story. Themes of sexuality, oppression of women, as well as other numerous types of conflict portrayed in this rather somber short story have made it a popular study among scholars and students alike. Steinbeck also uses literary elements including a dramatic tone, rich symbolism, and personification which increase the stories feeling and value exponentially. Steinbeck

Arabidopsis thaliana is the model organism chosen for investigation of miRNA expression because its entire genome has been sequenced (Weems 362-369). This organism also has a short life cycle and grows relatively quick with restricted space and this also makes it useful for lab research (Weems 362-369). The nutrient concentrations that were observed in this study included phosphorus and sulfur. These nutrients are specifically used because they are considered macronutrients that are required for plant growth (Axtell). Phosphorus is a component of nucleic acids, phospholipids, ATP and coenzyme. Sulfur is also a component

The cells of secondary xylem combined with parenchyma are made by vascular cambium. When the vascular cambium creates new cells, the secondary xylem builds on the inside causing the tree trunk to increase in size. When vessel elements and tracheid are first created they are alive but die when they mature and become functional. The vessel elements and tracheid function a few cells layers behind the vascular cambium in the sapwood, which is the water conducting section of wood. The vascular cambium and vessels or tracheid make the parenchyma.

Mitotic division plays a key role in the growth of the root tip of an onion, genus Allium. More specifically, mitosis is responsible for the way in which the root tip elongates. The cells spend a certain amount of time in each stage of mitosis. Assuming a 24hr cycle, the time for each mitotic stage can be calculated as the duration. In Allium, mitosis occurs at different rates in different regions of the root tip. The regions are divided into the region of cell division, elongation, and maturation. The region of cell division can be further divided into zones IA, IB, IC, II, III, and IV.

Hair: composed of columns of dead, keratinized cells bound together by extracellular proteins. Hair has two main sections: The shaft- superficial portion that extends out of the skin and the root- portion that penetrates into the dermis. Surrounding the root of the hair is the hair follicle. At the base of the hair follicle is an onion-shaped structure called the bulb Papilla of the hair and the matrix within the bulb

Corsican hares prefer bushy areas with alternating clearings and not close to sea level. They may also live by cropland, Mediterranean vegetation, and forests. Italian hares are nocturnal, foraging in the night, and staying in the home during the day.

Cells are the major functional unit of living organisms. Each component of a cell plays a vital role and the cytoskeleton is just as important as any other organelle. Without the cytoskeleton a cell would have no structure. The cytoskeleton is composed of microtubules, actin filaments, and intermediate filaments, which are necessary for reproduction, maturation, and survival of plant cells (1). The primary function of the cytoskeleton is to provide framework for the cell and help support development and movement throughout the cell (2). The cytoskeleton contributes an overall structure for each cell, however different plants use the cytoskeleton for many different functions depending on how the microtubules and microfilaments are arranged. The cytoskeleton provides a plant with organogenesis, cell shape, regulates the speed of mitochondria, functions in plant gravitropism, and maintains organelle partitioning in single-cell C4 plants.

A plant’s ability to distinguish its own roots should be an inherent skill, because root growth occurs in a remarkably heterogeneous space (Hodge 2004).

Unlike animals that define all cell lineages during embryogenesis, plants are able to establish novel cell fates throughout their entire life cycle, especially during sexual reproduction. Sexual reproduction in flowering plants comprises of a process divided into three phases: sporogenesis, gametogenesis and embryo-/ endosperm-genesis.