During electron transport in photosynthesis, the inner compartment of the thylakoid membrane becomes:

A) filled with ATP.
B) more acidic than the stroma.
C) a storage site for electrons.
D) a site for the synthesis of galactose molecules.
E) a site for the synthesis of NADPH+.


B) more acidic than the stroma.

Biology & Microbiology

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Caribbean seagrasses are extensively fed on by all except

a. manatees. b. green sea turtles. c. some sea urchins. d. sea cucumbers.

Biology & Microbiology

Animal cells can survive only within a temperature range from about:

1.-2°C to 45°C (28°F to 113°F)
2.0°C to 40°C (32°F to 104°F)
3.0°C to 45°C (32°F to 113°F)
4.0°C to 48°C (32°F to 118°F)

Biology & Microbiology

Under natural conditions without modern medicine, which of the following conditions has the LEAST impact on fitness? 

A. Alzheimer disease, a neurological disorder that generally afflicts individuals over the age of 65 B. valvular stenosis, a birth defect resulting in a narrow valve that restricts blood flow from the heart C. amenorrhea, the inability to menstruate D. Tay-Sachs, a congenital (from the time of birth) disorder in which neurons degenerate

Biology & Microbiology

Which of the following is/are obligate intracellular parasites?

A. Chlamydia and Rickettsia
B. E. coli and Pseudomonas
C. Mycoplasma
D. Treponema pallidum

Biology & Microbiology