In the 1800s two scientists, Theodor Schwann and Matthias Schleiden, studied different types of organisms. After many years of studying a great variety of organisms, they drew similar but independent conclusions about their observations. Which statement is developed most directly from the conclusions and is part of the modern cell theory?
What kind of cell is represented by the above model?
There are many processes at work in the human stomach. The stomach is part of which larger system?
In 1838 botanist Matthias Schleiden determined that all plants are composed of cells. In 1839 anatomist Theodor Schwann proposed that all animals are composed of cells. In 1855 biologist Rudolph Virchow added to Schleiden’s and Schwann’s observations and proposed that all living things are composed of cells. Which statement is also part of Virchow’s cell theory?
Living organisms are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform.
Which of the following lists these levels in the correct order of organization from the simplest to the most complex?
Which structures perform similar functions in plant and animal cells?
Which structure of plant cells helps to maintain homeostasis?
An animal’s liver is very important. It cleans the blood while also playing a key role in digestion. Which level of biological organization does the liver belong to?
A strainer allows certain items through, but not others. Which cell part functions similarly to a strainer?
Which of these can be found in a plant cell but not in an animal cell?
Students observed cells under the microscope. They observed that the cells had a cell wall, cell membrane, nucleus, and many chloroplasts. Which observation helps students identify the type of cell observed?
Which cell structure functions like a school principal’s office?
The fluid surrounding the organelles of a cell is the —
In addition to other materials, both the respiratory system and the circulatory system move oxygen. Which of the following BEST explains why there are two human body systems to move oxygen?
Blood is an odd structure in animals because it is one of the few structures that has functions and is fluid. Blood is mostly made of two types of cells. Red blood cells carry oxygen to all parts of the body. White blood cells protect the body from disease using a variety of methods. Blood is best classified as a —
The primary function of a chloroplast is to —
Which statement accurately represents the differences in plant and animal cells?
Which of the following do all living organisms have in common?
The food that you eat travels from your mouth, down your esophagus, into your stomach, and through your small and large intestines before your body rids itself of solid waste. As the food passes through your body, it is digested, and you get important nutrients from the food.
Which of the following is the correct term used to describe a group of body parts working together to perform a specific function?
A student observing a sample of cheek cells noticed that all of the cells were identical. Which statement below explains why these cells are identical?
The skin of an animal functions to protect it from external factors, much like the walls of a house protect people inside it from weather. What structure of an animal cell is most like the skin of an animal and the wall of a house?
According to cell theory, what do each of the following organisms have in common?
Early Romans discovered that objects could be magnified through the construction and shaping of glass. For the past thousand years, this discovery has led to the construction and design of modern day microscopes. The development of the microscope was used in the 17th and 18th centuries to observe cells and eventually develop “cell theory”. Which of the following is the most basic explanation of “cell theory”?
The diagram illustrates cells found in the stomach. Which statement about the cells is correct?
What level of organization within a plant is the structure above?