Why does uncontrolled growth of algae in a lake cause fish to die?
Responses
The algae compete for the same food source as the fish.
The algae compete for the same food source as the fish.
Bacteria that eat dead algae use up all the oxygen in the water.
Bacteria that eat dead algae use up all the oxygen in the water.
Predatory fish increase in number and destroy other fish populations.
Predatory fish increase in number and destroy other fish populations.
The algae interfere with the fish's ability to reproduce.
The algae interfere with the fish's ability to reproduce.
What activity is the main cause of smog?
Responses
release of ozone by factories
release of ozone by factories
fossil fuel use in automobiles
fossil fuel use in automobiles
CFC use in spray cans
CFC use in spray cans
pesticide use on farms
fossil fuel use in automobiles
Why have frequent small controlled-burn wildfires not helped to maintain chaparral ecosystems?
Responses
Burnt ground encourages the growth of grasses, which compete with shrubs for nutrients.
Burnt ground encourages the growth of grasses, which compete with shrubs for nutrients.
Seeds of chaparral shrubs need a large accumulation of leaf litter in order to sprout.
Seeds of chaparral shrubs need a large accumulation of leaf litter in order to sprout.
Fire destroys the seeds of many types of chaparral shrubs.
Fire destroys the seeds of many types of chaparral shrubs.
The heat from forest fires destroys the roots of chaparral plants.
Seeds of chaparral shrubs need a large accumulation of leaf litter in order to sprout.
An ecosystem with high biodiversity experiences a wildfire. What is likely to happen?
Responses
The ecosystem will remain the same before and after the wildfire.
The ecosystem will remain the same before and after the wildfire.
Biodiversity will increase after the wildfire.
Biodiversity will increase after the wildfire.
Some of the species will live, and the ecosystem will survive with reduced biodiversity.
Some of the species will live, and the ecosystem will survive with reduced biodiversity.
All of the species will die, and the ecosystem will collapse.
Some of the species will live, and the ecosystem will survive with reduced biodiversity.
What type of RNA acts as a temporary copy of DNA's instructions and provides details on how to assemble a polypeptide chain?
The type of RNA that acts as a temporary copy of DNA's instructions and provides details on how to assemble a polypeptide chain is called messenger RNA (mRNA).
What do ribosomes do?
Responses
Produce small mutations in DNA sequences that help regulate genes
Produce small mutations in DNA sequences that help regulate genes
Unwind DNA so that its exposed based can be used to make mRNA
Unwind DNA so that its exposed based can be used to make mRNA
Assemble protein molecules using instructions provided by mRNA
Assemble protein molecules using instructions provided by mRNA
Copy a single DNA strand creating a second complimentary strand