Adenoviruses infect
A. the digestive tract.
B. the respiratory tract.
C. the nervous system.
D. both the digestive tract and the respiratory tract.
E. both the respiratory tract and the nervous system.
Answer: D
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Monocots and eudicots diverged about:
A. 500 million years ago B. 125 million years ago C. 60 million years ago D. 10 million years ago E. very recently
The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements?
A) PSI absorbs only short wavelengths of light. B) Electrons are excited by PSI or PSII, but not both. C) PSI is designated P700, whereas PSII is designated P680. D) The absorption maximum of PSII is 700 nm. E) The absorption maximum of PSI is 680 nm.
Answer the following statements true (T) or false (F)
1. Most extremophiles are archaea. 2. A pathogen is a parasitic microbe. 3. Feeding antibiotics to livestock promotes human health. 4. Mitochondria originated from proteobacteria.
A pH of 6 is ____ times more ____ than a pH of 2
a. 3; acidic b. 4; acidic c. 3; basic d. 10,000; basic e. 40; basic