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NHS-Biology Review#1
Biology Review 15-16
Question | Answer |
---|---|
What is the gradual, sequential regrowth of a community of species after a forest fire? | Secondary Succession |
An example of a feedback mechanism that maintains the equilibrium of your body temperature when your surroundings are very hot is | Heat receptors in the skin send a message to the brain. The brain sends the skin a response telling the skin to start sweating. Sweat cools the body. |
Which cellular structure is unique to plant cells and not found in bacterial cells? | Chloroplasts |
In the immune system, inflammation occurs when a pathogen enters the body. How does the inflammatory response act as a defense against infection? | Histamine is released, increasing blood flow and bringing white blood cells to fight the infection. |
Which type of evidence provides the best support for the hypothesis that the ancestors of tetrapods (amphibians, reptiles, and mammals) evolved legs before tetrapods were first seen on land? | Fossil record |
Miller and Urey exposed hydrogen gas, water vapor, ammonia, and methane gases to sparks in a reacting chamber. What was produced, giving support to certain hypotheses about how life began on Earth? | Organic compounds |
a loose combination of DNA and proteins | Chromatin |
one half of a duplicated chromosome | Chromatid |