Researchers studying the rigidity and flexibility of the cell envelope used chemotaxis to measure the ability of microbes to squeeze 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 because
A. it has only a single membrane.
B. lipopolysaccharide has no charge.
C. it has fewer flagella.
D. there is less structural carbohydrate.
E. there are fewer protein receptors.
Answer: D
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A. reproduction. B. morphology. C. nutrition. D. parasites.
Axons
A) carry action potentials. B) form the gray matter of the brain and spinal cord. C) process information. D) have receptors for neurotransmitters. E) receive information from the external environment.
A(n) ________ is a substance that appears to be identical to a drug being tested but has no known effect on the condition being studied
Fill in the blank(s) with correct word
Sweat glands produce (lysozyme/dermcidin/acid), which destroys the cell wall of bacteria by cleaving the bonds between the sugar subunits.
Fill in the blank(s) with the appropriate word(s).