Which choice accurately conveys the complexity of neural connections in the human brain?


A) About 100 billion neurons each contact 1,000 to 10,000 other neurons.

B) A million or so neurons each contact up to 100 other neurons.

C) 10 million or so neurons each contact up to 10,000 other neurons.

D) A billion or so neurons each contact up to a million other neurons.


A) About 100 billion neurons each contact 1,000 to 10,000 other neurons.

Biology & Microbiology

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Which of the following is the sugar component of DNA nucleotides?

a. deoxyribose b. thymine c. guanine d. cytosine

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Archaea are prokaryotes that are often found in inhospitable conditions such as hot springs and salt marshes

Indicate whether the statement is true or false

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In what way is proteobacterial photosynthesis different from plant photosynthesis?

a. Proteobacterial photosynthesis does not use a proton gradient. b. Proteobacterial photosynthesis does not consume CO2. c. Proteobacterial photosynthesis uses water as an electron donor. d. Proteobacterial photosynthesis uses a different type of chlorophyll.

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