The membrane protein that is bound by a chemical signal is called the ____
Fill in the blank with the appropriate word.
receptor
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How many molecules of ATP are needed to reduce one molecule of carbon dioxide to carbohydrate by oxygenic phototrophs during the dark reactions of photosynthesis?
A. 10-12 B. 2 C. 4 D. 3
The appearance of complex multicellular animals in the fossil record:
A. coincides with increased levels of oxygen in the atmosphere and ocean. B. occurred at about the same time as the appearance of land plants. C. occurred soon after the appearance of simple multicellular organisms. D. occurred after the appearance of complex multicellular fungi. E. coincides with time period when oxygen first began to accumulate in the atmosphere.
Where is extranuclear DNA located in mammalian cells?
A. Endoplasmic reticulum B. Mitochondria C. Ribosome D. Plasma membrane
During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a(n) ________.
A. trophozoite B. cyst C. sporozoa D. endospore E. seed