The organism found in contaminated powdered infant formula that can cause meningitis is ________.
A. Cryptococcus neoformans
B. Streptococcus agalactiae
C. Escherichia coli O157:H7
D. Cronobacter sakazakii
E. Escherichia coli K1
Answer: D
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Which observation(s) of the medium ground finch (Geospiza fortis) by Peter and Rosemary Grant verify Darwin's selection hypothesis? Check all that apply.
_____ Considerable variation existed in the beak size and shape of this finch. _____ The medium ground finch showed assortative mating according to beak size and shape. _____ Beak shape (depth) varied with the dryness of the year. _____ Offspring were similar to parents in beak size and shape.
If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative. B. more negative. C. No change would be observed.
Substances that release ions when dissolved in water and conduct electricity are ________.
A. electrons B. solvents C. nonpolar D. electrolytes E. covalent
Explain why a student of biology needs to study the hierarchy of levels of organization within and among living things.
What will be an ideal response?