How many crossovers occur during Meiosis?
a. 46 - 95
b. 128 - 146
c. 22 - 39
d. 200 - 250
e. 160 - 195
a
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Organs are made up of ________ type(s) of tissue.
A. Two or more B. Two C. One D. At least five
The portion of an enzyme to which substrates bind is referred to as the
A) substrate complex. B) active site. C) catalytic site. D) junction of van der Waals forces.
You are conducting a long term study of ecosystem functioning in a freshwater lake. You and your field assistants gather data for many biotic and abiotic factors, including species diversity, water and benthic quality, and turbidity. Over the ten years of your study, you find that the abundance of water lilies is correlated with several other factors. When water toxicity and turbidity are high and water pH is abnormally low, water lilies quickly become scarce, followed by periods where fish, amphibians, and water birds are also scarce or absent. In years water nutrient levels are very high, water lilies quickly become abundant, followed by years where wading birds are scarce. From these data, you conclude that water lilies are __________.
A. an umbrella species. B. a keystone species. C. an endemic species. D. a flagship species. E. an indicator species.
Oxygen, carbon dioxide, and other small nonpolar
molecules cross the plasma membrane through the process(es) of a. osmosis. b. diffusion. c. endocytosis and exocytosis. d. active transport. e. facilitated diffusion.