During an immune response, a T-cell releases interleukin-2 (IL-2), which then binds to receptors on the same T-cell, stimulating its own proliferation to amplify the immune response. This is an example of what type of signaling?

Which of the following questions is considered testable using the scientific method?

For proteins, what is their monomer, and what is one of their crucial roles in biological systems?

According to the rules of binomial nomenclature, which of the following is the correct way to write the scientific name for a domestic cat?

A student observes that plants grown in soil with added coffee grounds seem to grow taller. Based on this observation, which of the following is the best testable hypothesis?

An environmental scientist notices that fish populations in a lake decline significantly after heavy rainfall. Which of the following is a testable hypothesis based on this observation?

All of the following organelles are enclosed by at least one membrane, EXCEPT:

Which of the following questions is most suitable for investigation using the scientific process?

What specifically happens to a bacterial cell during plasmolysis?

When a neuron releases a neurotransmitter into the synaptic cleft, and that neurotransmitter diffuses across the tiny gap to act on a neighboring neuron, this is an example of what type of signaling?