Shigella species have the following characteristics except
A. not motile
B. release endotoxin
C. belong to Enterobacteriaceae
D. infect the small intestine
E. produce enterotoxin
Answer: A. not motile
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H1 binding to DNA is different than that of the other four histones because H1 binds to:
A. the major groove of the DNA only. B the DNA as it comes off both sides of the nucleosome. C. as a component of the octamer; however, unlike H2A, H3, and H4, H1 lacks the histone tail. D. one strand of the linker DNA as it comes off the nucleosome and binds a second site in the central region of the DNA supercoil. E. the DNA as a homotetramer.
If a human red blood cell takes the shortest possible route from the right ventricle to the right atrium, then it must travel through _____ capillary beds.
A. one B. two C. three D. four E. five
Which of the following is NOT true of lipids?
a. They store energy. b. They function as structural components of cellular membranes. c. They function as hormones. d. They are nonpolar. e. They have many oxygen-containing functional groups.
An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an
A) Trace element B) Macronutrient C) Growth factor D) Element E) Water