Prokaryote DNA replication is a semi conservative, bidirectional, template driven process. The phrase ‘semi-conservative’ refers to the fact that the newly synthesised double stranded DNA is made up of one parental (existing) strand, and one newly synthesised strand. The parental duplex is not ‘conserved’ as an entity. This was proved by the Meselson-Stahl experiment by replicating E.Coli in different mediums of of different Nitrogen isotopes. The results consisted of half of normal weight and half with intermediate weight, proving an immortal strand serving as an unchanging template.…
3.1 1. The improvements in the microscope help scientists see the cells better and distinguish the different organelles inside the cell. 2. Prokaryotic cells do not have a nucleus and most internal structures that eukaryotic cells. 3.…
Natalie Buttaccio Biol 251 Oliphant January 20, 2017 1. According to Bonnie Bassler in the video TedTalk, the human body is considered 90% prokaryotic because there are ten times more bacterial cells than human cells on a human being. Humans have approximately 30,000 genes, but you actually have ten times more bacterial genes. Bassler considers humans about 90% bacterial. These bacterial cells literally almost do everything, from digesting our food, making our vitamins, keeping us healthy, etc.…
Cell and colony morphology have been very useful taxonomic features in the differentiation and classification of microorganisms (2). Microscopic examination allows microorganisms to be viewed under magnification, to allow cell morphology to be determined. The most common cell shapes are…
Purpose: To observe different species of living protists in pond water under the microscope. Taking note of their size, movements, and characteristics to classify the different types of protists from applying previous knowledge of protists. Materials: The materials in this lab that will be needed are a microscope, slide, coverslips, a pipette, and a dish of pond water. Procedure: Prepare a slide by using the pipette to apply two drops of pond water on a slide and properly place a coverslip.…
Gram-negative bacteria are often harmful to a host, which is the case for many of the Salmonella bacteria. Protists 1.) Irish Moss- I knew that this was Irish Moss because it was reddish and kind of like seaweed. This is a protist because it lives in the water like a regular protist would normally do.…
Organelles in the Cell Cells are the smallest structural unit of all organs and organ systems. They are essential to life. Both animal species and plant species need cells to maintain life. Cells have many and are made up of many organelles that have specific jobs. Animal and plants cells are different, but mainly composed of the same things.…
Some bacterial cells are naturally…
Some known Gram-positive genera are Bacillus,…
1. Problem to be addressed. To study the effect of a paraprobiotic, heat inactivated Lactobacillus gasserei, on the functioning of the central nervous system using mouse models. 2.…
Tetrahymenas are freshwater ciliated protozoan and are the ideal candidates for the study of cells for students (Bozzone 1). Another benefit of using tetrahymena is that they can be easily grown in a lab. These eukaryotes are found in fresh water ponds, streams, and lakes (Ciliate Genomic Consortium). Phagocytosis carried out by only a few organisms that are specialized for the uptake of large particles from the environment (Karp 315). The tertrahymena feeds by undertaking phagocytosis.…
INTRODUCTION Cellular respiration is the breaking down of organic molecules by means of catabolic pathways that uses electron transport chain to produce ATP (Campbell 2011). ATP is used as energy in the synthesis of light or also known as Photosynthesis . ATP is used by photosynthetic organisms to produce their own food and also by performing cellular respiration. It needs mainly glucose and oxygen that involves the transfer of electrons in a chemical reaction.…
Some of these organelles include the nucleus, which holds the cells DNA, mitochondria, which produce ATP from glucose and oxygen, known as cellular respiration, and the golgi body which packages and processes different substances leaving the cell. Prokaryotic cells are the simpler of the two cells and are single celled organisms, such as bacteria, that don’t contain organelles.…
Units of the Archaea can be described as inhabitants of drastically hostile surrondings. The Eubacteria, are pervasive living agreeably in most enviornments. Every breath carries some bacterial spores, and almost every surface holds them. When it comes to the intestines, some are helpful, giving nutrients, vitamins and absorbing water in return for space. Some prokaryotes are our enemies, causing diseases and…
