Describe four properties of water that make it indispensable for life as we know it on Earth. How do the properties of water arise?
What will be an ideal response?
Water is an excellent solvent of polar molecules. As a result, it is the primary liquid in which all animal tissues are bathed. Water is also characterized by having a high boiling point and a high freezing point, which means that water will remain in its liquid state at average earth surface temperatures. All of the preceding properties are due to hydrogen bonds between water molecules. Finally, water is denser as a cold liquid than as ice, which means that ice will float and act as insulation against the freezing of deeper water layers.
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Eukaryotic cells manufacture cytoskeletal proteins, which help to maintain cell shapes and functions. What would you predict about these proteins?
A) They initially contain signal sequences that allow their entrance into the endoplasmic reticulum. B) They are manufactured on free ribosomes in the cytoplasm. C) They are glycosylated in the Golgi apparatus. D) They travel to the nucleus in a transport vesicle with a specific signal.
Bacteria and Archaea both have members that use sulfur compounds as a terminal electron acceptor
Indicate whether this statement is true or false.
If the world were to support the largest possible human population, all humans would need to be
A. carnivores. B. omnivores. C. herbivores. D. producers.
Energy sources of photosynthesis reactions The energy source for the light reactions is _____; the energy source for the carbon reactions is ______.
a) sunlight, carbon dioxide b) sunlight, ATP c) ATP, oxygen d) Sunlight serves as the energy source for both sets of photosynthetic reactions.