Written by tutor Rachel L.
Just like we need energy to get through the day, individual cells need energy for survival too. Cellular respiration is the process by which cells get their energy in the form of ATP. There are two types of cellular respiration, aerobic and anaerobic. Aerobic respiration is more efficient and can be utilized in the presence of oxygen, while...
Written by tutor Michael W.
Cells were first described by Robert Hooke in his book Micrographia, published in 1665. Using a microscope, he described the structure of cork as closely resembling prison chambers or monks’ quarters (there is some debate about this). He used the term “cell” to describe these hollow chambers. The Cell Theory was first described in 1839. While the Cell...
The Cell Membrane
Written by tutor Shannon M.
The cell membrane in animal cells is the outer layer of the cell. It gives the cell some structure and stability, while holding everything in. Imagine you go to the pet store and pick out some goldfish; they give you the goldfish in a plastic bag filled with water. This is our cell. The bag is the cell membrane, very fluid, but it keeps all...
Written by tutor Katherine P.
What is the Cell Cycle?
Cells grow and divide as organisms grow and develop. Cells also grow and divide to repair tissue. Some single-celled organisms reproduce asexually through a type of cell division called
binary fission. The cell cycle is the life cycle of a cell, as it grows, replicates its chromosomes, separates its chromosomes and...
Differences between Plant and Animal Cells
Written by tutor Kathie Z.
Plant cells have cell walls for support outside their cell membrane and are usually rectangular in appearance when viewed under the microscope. They are rectangular prisms in 3-dimensions. Most plants are autotrophs and have chloroplasts (plastid organelles filled with chlorophyll) which provide a distinctive green...
Science Lessons & Help
Welcome to the Wyzant Science Help Section! This section is a resource for students who are struggling with science concepts. Explore the science help section and be sure to let your favorite
science tutor know if you have any questions.
Do you know what's in a
cell or how they were discovered? Want to know more about