MICR 130 Module 2 Exam Questions With Verified Answers

MICR 130 Module 2 Exam Questions With Verified Answers A sodium ion can pass through the plasma membrane because the positive charge allows it to bind to the negative phospholipid. - Answer-false /.Axial filaments are uniquely found in ______ cells. - Answer-spirochete /.By which of the following mechanisms can a cell transport a substance from a lower concentration to a higher concentration? - Answer-Active transport /.Cells placed in a hypotonic solution tend to lose water due to osmotic pressure - Answer-false /.Cells placed in a hypotonic solution tend to lose water due to osmotic pressure. - Answer-False /.Each of the following statements concerning the gram-positive cell wall is true except _____. - Answer-it protects the cell in a hypertonic environment /.Even though narrow spectrum antibiotics are only effective against a few species, they are preferred because ______. - Answer-broad spectrum antibiotics will kill the normal microbiota as well /.f you isolate LPS from the cell wall of an unknown microbe, you know that ___. - Answer-you have isolated a gram-negative bacterium /.Fimbriae and pili differ in that fimbriae _________. - Answer-are used for attachment /.How do spirochetes and spirilla differ? - Answer-Spirilla can have an external flagella but spirochetes have axial filaments. /.How would a cell without flagella be described? - Answer-Atrichous /.If a eukaryotic cell lost its ER, it would _____. - Answer-lose the ability to synthesize lipids /.If a eukaryotic cell lost its peroxisomes, it would _____. - Answer-lose the ability to break down alcohol, a toxin /.If you isolate teichoic acid from the cell wall of an unknown microbe, you know that _________. - Answer-you have isolated a gram-positive bacterium /.In a Gram-negative cell, the peptidoglycan layer exists ____. - Answer-in the periplasm /.In a Gram-positive cell, the peptidoglycan layer exists __ - Answer-on top of the plasma membrane, outside of the cell /.Isoniazid alone works effectively against mycobacterial species. - Answer-false /.Nitrate, NO3-, is an important nutrient for many bacteria. By which mechanism would a bacterium transport nitrate into the cell? - Answer-Facilitated diffusion /.Oxygen crosses a plasma membrane _____. - Answer-simple diffusion /.Penicillins show great selective toxicity because _____. - Answer-peptidoglycan is not found in human cells /.Positive phototaxis describes ______. - Answer-movement towards a light source /.Small hydrophobic molecules would likely enter a cell ____ - Answer-by passive transport directly across the membrane /.Some microbes can cause secondary infections after being killed by antibiotics due to the release of an LPS endotoxin. Which of these microbes could cause such an infection? - Answer-Salmonella typhimurium, a gram negative microbe that can cause severe intestinal disease /.Symport, Uniport, and Antiport are all examples of ______. - Answer-active transport /.The difference between simple diffusion and facilitated diffusion is that facilitated diffusion ____. - Answer-can move materials from a lower to a higher concentration /.The glycocalyx is a coating around a microbe that is composed primarily of ____ - Answer-polysaccharides /.The glycocalyx is a coating around a microbe that is composed primarily of _____ - Answer-polysaccharides /.typical bacterial cell has a salt concentration of 1%. If the cell is placed in a solution containing 10% salt, the net flow of water will be ___. - Answer-out of the cell /.What is the function of the ER? - Answer-synthesis of moleules