Which of the following is a fundamental tenet of the cell theory?

Which of the following best defines endosymbiosis?

When a neurotransmitter binds to a protein on the surface of a neuron, causing that neuron to fire an electrical impulse, the neuron itself acts as the ______.

What is the main focus of phylogeny in biological studies?

When classifying two newly discovered organisms, a scientist finds that they share 98% of their DNA sequence and have very similar bone structures. These findings would primarily be used to determine their classification based on ______.

What is formed when two or more atoms are held together by chemical bonds?

Which of the following macromolecules is characterized by a diverse range of structures, often containing long hydrocarbon chains, and is primarily hydrophobic?

You notice that your houseplant’s leaves are turning yellow. You hypothesize that it’s not getting enough water. You then decide to water it more frequently for a week to see if the leaves return to their normal color. This process is an example of ______.

Which level of biological organization encompasses all the living things on Earth, as well as all the places where life exists?

Which two types of organisms are exclusively composed of prokaryotic cells?