________ is a macromolecule containing alternating N-acetylglucosamine and N-acetylmuramic acid cross-linked by short peptide fragments.
Fill in the blank(s) with the appropriate word(s).
Peptidoglycan
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Bacteria that live attached to surfaces are described as ________, whereas bacteria that are free-living, floating with a fluid environment are described as ________.
Fill in the blank(s) with the appropriate word(s).
What is the function of surfactant in the mammalian respiratory system?
A. reduction of surface tension in the fluid covering the alveoli B. capture and removal of inhaled foreign particles C. maintaining a moist surface D. transport of oxygen E. It functions as an antibiotic.
The standard or housekeeping sigma factor used most often by E. coli RNA polymerase under normal growth conditions is called sigma ________.
A. S B. E C. 70 D. 32
The following steps occur during biosynthesis of a + strand RNA virus. What is the third step?
A) attachment B) penetration and uncoating C) synthesis of - strand RNA D) synthesis of + strand RNA E) synthesis of viral proteins