Chapter 2 Flashcards
What occurs as water cools below 4º C?
It decreases in density
How does the viscosity of water affect movement in small aquatic animals?
It prevents them from sinking
Which water system would you expect to have the lowest dissolved nutrient content?
a rain-fed stream
The sample standard deviation is
a measure of how widely the data are spread.
Without adaptations to control the movement of water and salts across their external surfaces, what would happen to marine animals?
They would accumulate too much salt in their cells.
What is the affect of a boundary layer in a photosynthetic organism?
It slows the rate of gas diffusion.
Why are deep ocean waters typically low in oxygen?
a lack of photosynthetic organisms
Why are thermophilic bacteria able to withstand very high temperature?
high proportions of particular amino acids that form strong bonds
Which is an adaptation that enables fish to survive in very cold seawater?
increased glycerol concentration
Which helps organisms survive a wide range of temperatures?
isozymes
