are bacterial structures involved in the passage of dna into or out of the cell.
The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell. plasma membrane. nucleoid region. ribosome. pili. cell wall. The structure that regulates the passage of material into and out of this bacterial cell is indicated by the letter _____. (Activity 27B). The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell. Bacterial chromosome: It is usually a single molecule of double stranded Dna length of the chromosome is often more than the length of the cell. Hence nucleur material is believed to be in a super coiled state. Histone-like proteins are complexed with Dna for structural support. Like the chromosome, plasmids are made of a circular piece of DNA. Unlike the chromosome, they are not involved in reproduction. Only the chromosome has the genetic instructions for initiating and carrying out cell division, or binary fission, the primary means of reproduction in bacteria. Structure of plasma membrane: Bacterial membrane are composed of phosholipid and proteins. The arrangement of proteins and lipids to form a membrane is called the fluid mosaic model. Dispersed within the phoshopholipid bi-layer are various structural and enzymatic protiens which carry out most membrane functions. Bacteria and yeast. Anaerobic respiration takes place in yeast and some bacteria, producing ethanol and carbon dioxide. They have been used in the making of many foods such as bread, yoghurt and vinegar. You must know the structure and functions of a bacterial cell and yeast cell. Diagram of bacterial cell. The structure of bacterial cell organelles and their functions : Cell envelope: The envelope is a descriptive term for the several layers of material theat envelope the protoplasm of the cell, it is made up of cytoplasmic membrane, cell wall and capsule. Capsule: Some bacteria have a polysaccharide layer outside the cell wall. This layer is called a capsule. A true capsule is discrete detectable layer of polysaccharides deposited outside the cell wall as seen in Haemophilus influenzae and Streptococus pneumoniae. 7. The _____ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell. (Activity 27A). The structure that regulates the passage of material into and out of this bacterial cell is indicated by the letter _____. In gram-negative bacteria, the cell wall is thin and releases the dye readily when washed with an alcohol or acetone solution. Cytoplasm-The cytoplasm, or protoplasm, of bacterial cells is where the functions for cell growth, metabolism, and replication are carried out. It is a gel-like matrix composed of water, enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids. Unlike the eukaryotic (true) cells, bacteria do not have a membrane enclosed nucleus. The chromosome, a single, continuous strand of DNA, is localized, but not contained, in a region of the cell called the nucleoid. All the other cellular components are scattered throughout the cytoplasm.
Inside the cell