Researchers studying the rigidity and flexibility of the cell envelope used chemotaxis to measure the ability of microbes to squ
eeze through tight spaces. E. coli, a gram-negative bacterium, was able to traverse narrower channels than B. subtilis, a gram-positive microbe, even though both cells are the same size when grown without restriction. E. coli has the more flexible cell envelope becauseA. lipopolysaccharide has no charge. B. it has fewer flagella.
C. it has only a single membrane.
D. there is less structural carbohydrate.
E. there are fewer protein receptors.
Most bacterial cells have a cell wall located outside the plasma membrane, formed by peptideoglycan or murein, which provides protection and shape to the cell. In addition to the wall, some bacteria have a polysaccharide capsule that surrounds this structure, this capsule is a carbohydrate envelope that can allow more or less flexibility to the bacterial cell. The more structural carbohydrates the polysaccharide capsule has the less flexible the bacteria will be. Thus, we can say that if E. coli has the most flexible cell envelope, compared to the envelope of other bacteria, it is because there is less structural carbohydrate in the E. coli envelope.
The answer that best fills in the blank would be pernicious.
A woman complains of chronic gastritis, fatigue, weight loss, and tingling in her fingers. laboratory findings show low hemoglobin and hematocrit levels, and a high mean corpuscular volume. these findings are consistent with pernicious anemia.
When higher levels of carbon dioxide is present in the environment and a mustard plant seedling is transferred to an environment, the new leaves have a lower stomata-to-surface-area ratio, it is because the concentration of carbondioxide is high in the surrounding so the plant produce small leaves having less number of stomata. If the concentration of carbondioxide is lower so big leaves are produced having maximum number of stomata.
