Obligate intracellular, gram-negative bacteria best describes:

A. Streptococcus pyogenes.
B. Helicobacter pylori.
C. Rickettsia prowazekii.
D. Mycoplasma pneumonia.


Ans: C. Rickettsia prowazekii.

Biology & Microbiology

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The zig-zag and solenoid models are associated with the _______ level of DNA organization

A. histone B. 11nm fiber C. beads-on-a-string D. 30 nm fiber E. scaffold protein

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A nutrient is a substance that an organism uses for

A. growth. B. metabolism. C. maintenance. D. repair of tissues. E. All of the answer choices are correct.

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Which of the following best characterizes the eudicots?

A) flower parts in threes B) leaves with parallel veins C) an embryo with two seed leaves D) stems with scattered vascular bundles

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Cells with a similar structure and function are organized into ________ in the body.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology