Match the molluscan body part to its function.
1. mantle cavity
2. visceral mass
3. mantle
4. foot
a. movement
b. houses organs
c. secretes the shell
d. houses gills
1. d. houses gills
2. b. houses organs
3. c. secretes the shell
4. a. movement
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A biome is most specifically defined as ____
a. a vegetation type plus its associated microorganisms, fungi, and animals b. a biological community and the physical environment with which it interacts c. the total dry weight of plants present in a specific area at any given time d. an assemblage of species living in the same place e. a group of organisms of the same species living together at one time
Biosphere 2 was an attempt by scientists to build a completely closed ecosystem in Arizona. It failed
because of the
a. decreased level of oxygen through respiration by soil microorganisms. b. contamination of food by soil microorganisms. c. disease outbreak caused by soil microorganisms. d. increased level of carbon dioxide produced by photosynthetic microorganisms. e. inability of soil microorganisms to recycle nitrogen.
Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus
In which stage of the cell cycle did the nucleus contain 6 picograms of DNA? A) G1 B) S C) G2 D) M
Studies of arginine biosynthesis in mutant stains of Neurospora provided evidence of a direct relationship between genes and enzymes, including development of the one gene-one enzyme hypothesis. Who conducted these studies?
a. Archibald Garrod b. Watson and Crick c. Beadle and Tatum d. Frederick Griffith