ADH controls how diluted or concentrated urine is by controlling the:
A. permeability of the collecting ducts to
water.
B. permeability of the collecting ducts to
electrolytes.
C. permeability of the collecting ducts to urea.
D. permeability of the loops of Henle to water.
E. permeability of the loops of Henle to
electrolytes.
A
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Through studies using the animal cap assay this morphogen was shown to be important for the determination of the different types of mesoderm tissue in the developing embryo.
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
In response to a high fat content in chyme, the duodenum releases ____
a. gastrin b. somatostatin c. CCK d. secretin e. GIP
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.
The evolution of biochemical molecules started on Earth ____.
A. after the appearance of prokaryotic cells B. long before any cells emerged C. after the appearance of eukaryotic cells D. after the appearance of eukaryotic cells but before the appearance of multicellular organisms E. after the appearance of multicellular organisms