Which organism interaction is most likely to directly limit population growth when resources become scarce?
Which description best represents logistic population growth?
What does carrying capacity (K) represent in a population graph?
Which situation best demonstrates negative feedback in an ecosystem?
A drought reduces the amount of available water in an ecosystem. What is the most likely effect on carrying capacity?
Which observations suggest a population is approaching carrying capacity? (Select 3.)
Which changes could decrease carrying capacity? (Select 2).
As population size increases, which change is most likely to occur?
Which statement best describes carrying capacity?
The 10% rule states that 10% of energy moves from each trophic level to the next.
In the pyramid, if the producers level contains 1234 kilocalories, how many kilocalories are transferred to the primary consumer level?
The diagram is intended to show relationships in an ecosystem. What do the arrows represent?
Using the diagram provided, which of the following energy pyramids best represents the data?
What are the organisms that break down dead leaves in a forest?
In an energy pyramid, energy __________ as you move up the pyramid.
In a forest ecosystem, what are deer and rabbits classified as?
In a garden ecosystem, what are plants classified as?
Look at the food chain and answer the questions.
If the population of seals decreases, what will happen to the population of chinstrap penguins?
Which of these ecosystems would be most likely to recover?
If an invasive species (a species from a different place) is brought into a new ecosystem and reproduces rapidly, how would that likely affect the ecosystem?
Deforestation means cutting down many trees in an area. How does deforestation affect an ecosystem?
An event, such as a storm, fire, flood, drought, overgrazing, or human activity, that changes an ecosystem and alters resource availability is called a...
How is biodiversity beneficial to an ecosystem?
Warmer winters are also causing more bark beetle outbreaks. Because the winters aren’t as cold, more beetles survive through the season and are able to reproduce, increasing their numbers and the damage they cause.
This graph shows the area burned by wildfires every year from 1983 to 2008.
Use the codon chart to answer the questions.
The DNA sequence CAA would create an mRNA codon that would code for which amino acid?
A segment of a DNA molecule contains the base sequence: TAC CCA GGT.
Using the mRNA codon chart, which amino acid sequence would be produced from this DNA base sequence?
Red blood cells contain the hemoglobin protein, which is a carrier of oxygen. In sickle cell anemia, the hemoglobin present in red blood cells becomes abnormal and sickle shaped. Abnormal hemoglobin cannot carry as much oxygen as normal hemoglobin.
The sequences given show sections of the DNA sequence that produce both the normal and abnormal types of hemoglobin.
Which amino acids are coded for by the abnormal DNA?
The diagram shows a single DNA strand.
What would happen if thymine (T) was replaced by adenine (A)?
When a strand of DNA was replicated, one base was left out. Why would this be more damaging than if the base had only changed?
Which series of steps describes the process of how traits are created from the genetic code?
A section of DNA codes for the sequence of nitrogenous bases of mRNA to initiate protein synthesis as shown.
What is the process involved in the coding?
The diagram shows the process of making proteins in a cell.
What are the processes P and Q?
Which factor most directly influences the sequence of amino acids in a protein?
Why is DNA important for a cell?
What is the role of mRNA during protein synthesis?
If the secondary consumer level contains 900 kilocalories, how many kilocalories are transferred to the tertiary consumer level?
Climate change means the Earth is getting hotter. It is causing ice to melt and disappear. Phytoplankton live in ice, so the population of phytoplankton is decreasing. What will happen to the population of krill as phytoplankton decrease?
Look at the graph. What has happened to the ecosystem disturbances over time?
Which of the following ecosystem disturbances affected piñon pines? (Select all that apply.)
Which statement best describes the resilience of the ecosystem in the Four Corners region?
Deer eat the nuts of piñon pine trees. After repeated wildfires in the Four Corners ecosystem, what most likely happened to the population of deer?
The piñon jay has a symbiotic relationship with the piñon pine. It helps to spread piñon pine seeds so new trees can grow. If humans take steps to conserve (protect) piñon jays in the ecosystem, how will that likely affect the resilience of the ecosystem?
