Answer:
There are three amino acids that have basic side chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). Their side chains contain nitrogen and resemble ammonia, which is a base. Their pKa's are high enough that they tend to bind protons, gaining a positive charge in the process.
Explanation:
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Answer:
Explanation:
Although first discovered within the nucleus of eukaryotic cells, nucleic acids are now known to be found in all life forms including within bacteria, archaea, mitochondria, chloroplasts, and viruses
Answer:
Fossil fuels produce carbon emissions that contribute to the greenhouse effect. The greenhouse effect is heating up the Earth's atmosphere and causing global warming.
Explanation:
Here are few of the things that scientists think may happen as the temperature rises. Some of them are already happening:
Glaciers melting - Many glaciers are already melting and shrinking throughout the world. If the temperature increases they will continue to melt. This will cause animals that rely on glaciers such as polar bears and other species to become extinct.
Ocean levels will rise - As the glaciers melt, the ocean levels will rise. This could cause flooding in cities located near the coast.
Migration of animals - Animals will migrate to cooler spots as their old habitats get too warm. This could upset the food chain and put some species in danger of extinction.
Extreme weather - Some scientists think that warming will fuel more powerful hurricanes as well as more droughts and flooding in different areas of the world.
Change in ecosystems - cold weather biomes such as the tundra will shrink, while desserts will continue to expand.
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The four biological macromolecules are carbohydrates, lipids, proteins and nucleic acid. These macromolecules are known as polymers and are built when <span>monomers </span><span>join together by a process known as the dehydration reaction. The dehydration reaction is a chemical reaction that produces water (H2O) and the result is the covalent bonding of the two monomer molecules. The monomer molecules consist of nutrients found in the soil, as in the case of plants, and the intake of food as in the case of animals. </span>
