What virulence factor(s) do all Gram-negative bacteria share?
A. proteases that destroy IgA antibodies
B. fimbriae
C. lipid A
D. a glycocalyx
E. both fimbriae and a glycocalyx
Answer: C
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Which of the following best describes the factors determining water potential of plant cells?
A. solute outside the cell B. solute inside the cell C. cell turgor pressure D. pressure at the cell wall-membrane interface E. All of these are true
Which of the following is NOT found in a
femur?
a. spongy bone b. compact bone c. connective tissue d. collagen e. all of these are found in a femur
________ are microscopic prokaryotes inhabiting, among other hostile places, hot springs and very salty waters
Fill in the blank(s) with correct word
Unlike DNA, which typically forms a helical structure, different molecules of RNA can fold into a variety of three-dimensional shapes. This is largely because ___________________
(a) RNA contains uracil and uses ribose as the sugar. (b) RNA bases cannot form hydrogen bonds with each other. (c) RNA nucleotides use a different chemical linkage between nucleotides compared to DNA. (d) RNA is single-stranded.