___ molecules diffuse readily across the membrane.
a. Water
b. Hydrogen ions
c. Hydrophillic
d. Carbon dioxide
d. Carbon dioxide
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Match the following items with the correct phrases.
_______1. Some of these bacteria live in and near root nodules of plants called legumes, including alfalfa, clover, peas, soy beans, and peanuts. _______2. Convert nitrogen in the air into ammonia in the soil by a process called nitrogen fixation. _______3. Convert the nitrogen that is found in dead plants and animals to ammonia in the soil by a process called ammonification. _______4. Convert nitrates in the soil to nitrogen in the air by a process called denitrification. _______5. Convert ammonia in the soil to nitrites and nitrates by a process called nitrification. a. decomposers and saprophytes b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. nitrogen-unfixing bacteria
What is the role of actin in eukaryotic cells?
A. It forms the centromere that holds sister chromatids together. B. It forms the spindle that pulls chromosomes apart. C. It is necessary for the DNA to replicate. D. It provides strength in stretching and compression of a cell. E. It forms the structures inside flagella that allow the bending motion for cell motion (swimming).
Over __________ genes are involved in skin color
determination. a. 100 b. 40 c. 10 d. 1 e. 1000
Which of the following events will occur as an ocean current moves from an equatorial region towards a polar region?
A. The current will be warm as it leaves the equatorial region and begins to cool as it moves towards the polar region. This in turn will cause the air currents to become warmer as they move closer to the poles, creating a desert type of biome. B. The current will be cool as it leaves the equatorial region and begins to warm as it moves towards the polar region. This in turn will cause the air currents to become cooler as they move closer to the poles, creating a tundra type of biome. C. The current will be warm as it leaves the equatorial region and begins to cool as it moves towards the polar region. This in turn will cause the air currents to become warmer as they move closer to the poles, creating a grassland type of biome. D. The current will be warm as it leaves the equatorial region and become even warmer as it moves towards the polar region. This in turn will cause the air currents to become warmer and drier as they move closer to the poles, creating a tundra type of biome. E. The current will be warm as it leaves the equatorial region and begins to cool as it moves towards the polar region. This in turn will cause the air currents to become cooler as they move closer to the poles, creating a tundra type of biome.