Concept explainers
To calculate:
The time required by Escherichia coli
Concept introduction:
Flagella present in a bacteria are thin, long attachments that are fixed into the cell at one end and free at the other end. In Escherichia coli, peritrichous arrangement of flagella is observed. Most of the studies regarding
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Brock Biology of Microorganisms (15th Edition)
- Measure the length of Cell X using the ruler in Microsoft Word. Assuming the actual length to be 3 um, calculate the magnification. Show your complete solution. Based on Figure 1, what internal organization can be distinguished in cell X? Why? Based in Figure 1, can you see a limiting membrane? Can you deduce its presence? Why or why not? Figure 2 is an electron micrograph of the same type of bacterium as shown in Figure 1. The picture has been obtained by cutting a very thin section of the bacterial cell along its longitudinal axis. Measure the total length of the cell, and assuming the actual length to be 2.1 um, calculate the magnification. With reference with Figure 2, what are the major differences between the inclusions found in Figure 1 and the way they appear in Figure 2? What other structural features can be resolved?arrow_forwardComplete the analogy Peroxidase: Haem :: Carboxypeptidase: Zn2+ Fe2+ Ca2+ Cu2+arrow_forwardArrange the following layers in the correct order from the inside to outside.arrow_forward
- In the diagram below, identify the structures of a cyanobacterial cell based on the following descriptions: a) Outer cellular covering which includes: Mucilaginous layer – outermost layer covering the cell wall; protects the cell from harmful factors of the environment Cell wall – found just below the mucilaginous layer; 2 or 3-layered, the inner layer lies in between the outer wall layer and plasma membrane; the outer layer is made of peptidoglycan Innermost plasma membrane – selectively permeable membrane enclosing the cytoplasm b) Cytoplasm – found below the plasma membrane; the protoplasm which contains structures of different shapes and functions. Lamellae, which contain pigments such as chlorophylls, carotenes, xanthophylls, phycoerythrin and phycocyanin, are located in the peripheral region of cytoplasm. Ribosomes may also be found scattered in the cytoplasm. c) Nucleic material – the nucleoplasm that is centrally located in the cell and contains chromatin in the form…arrow_forwardDescribe the cross - section side view of a Gram - negative cell . Clearly state where the following would be located or write the letters in order of appearance from the outside to the inside . If any of these structures are not present , make sure to leave them out . A ) peptidoglycan ; ( B ) periplasm ; ( C ) porin ; ( D ) LPS ; ( E ) teichoic acids ; ( F ) plasma membrane : ( G ) outer membrane : ( H ) nucleoidarrow_forwardUsing the video from https://www.pbs.org/video/natures-cutest-symbiosis-the-bobtail-squid-4bhtmo/ The bobtail squid and Vibrio fischeri serve as model organisms for studying cellular communication. Provideat least two examples of communication either between squid and bacteria or within bacteria from the film.arrow_forward
- Assume the diameter of the field of vision in your microscope is 1.75mm under low pressure. If one bacillus is 5um, how many bacillus cell could fit end to end across the field. How many 7um yeast cells could fit across the field?arrow_forwardDescribe the cells that make up the ascending loop of Henle. Include a clear explanation of how the cell’s unique features enable its unique action.arrow_forwardSuggest a hypothesis for the following observations: a) Living cells have contractile vacuole b) potatoes turn green when exposed to lightarrow_forward
- E R Blodea in saline (salt) solution 8 ELODEA IN SALINE SOLUTION Draw what the Elodea cells looked like when placed in saline solution. Total Magnification = 400 1. Fill in the blank using one of the three tonicity terms: Saline solution is compared to the cytoplasm of the Elodea cells. F11 F12arrow_forwardShow solution with correct formula. A jar has 2 amoebas in it. Amoeba splits into two (doubling in size) once every second. The jar will be completely filled in 20 seconds. How long would it take to fill the jar if it had already 8 amoebas in it?arrow_forwardvisit www.youtube.com/watch?v=iNXTSxPZF0U Observe the Volvox for a few minutes. These small green spherical colonies of up to thousands of Chlamydomonas-like cells, are usually slowly rolling around in the water mount. Is there any type of coordination in a colony like this?arrow_forward