What proportion of the brain (approximately) is made up of neurons?

A. 100%
B. 70%
C. 50%
D. 20%
E. 2%


E. 2%

Biology & Microbiology

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To what class does the Eastern Gray Squirrel belong?

A. Mammalia B. Amphibia C. Aves D. Chondrichthyes

Biology & Microbiology

A phylogenetic tree is a

A. hypothesis about the evolutionary history of a species. B. guess about the evolutionary history of a species. C. factual representation of the evolutionary history of a species D. detailed timeline of a species' evolutionary history. E. none of these

Biology & Microbiology

Cells of multicellular eukaryotes have receptors that can recognize approximately ____ pathogen-associated molecular

patterns (PAMPs).

a. 10 b. 100 c. 1,000 d. 10,000 e. 100,000

Biology & Microbiology

Make a sketch showing how nondisjunction in meiosis can result in Down syndrome. What will be an ideal response? What will be an ideal response?

The sketch should show how a gamete can end up with an extra chromosome 21 and should resemble Figure 16-4 (shown for male gametes) or a corresponding version for female gametes.

Biology & Microbiology