Chapter 7 vocab test
Terms in this set (35)
Cilia and flagella are used to move cells through watery environments. What role do these cell parts play on stationary cells?
They move substances along the surface of the cell.
What is a major difference between facilitated diffusion and active transport?
Active transport moves substances from low concentration to high concentration
The structure of a cell enables it to carry out its functions. Look closely at the single-celled organism in the illustration below.
Which structure allows this organism to move?
Which type of transport uses vesicles to move large amounts of substances out of the cell?
Lysosomes contain digestive enzymes for breaking down carbohydrates, proteins, and lipids.
Patti was studying how to classify organisms. She prepared the chart shown below. According to Patti's chart, how do plants differ from animals?
method of nutrition
A cell contains a higher concentration of a substance than its surrounding environment. The cell membrane is highly permeable to this substance. What will happen as a result of diffusion?
The cell membrane will allow the substance to move to the cell's environment.
Which statement is true about bacterial cells?
The cells have no nucleus.
Why are viruses NOT organisms according to the cell theory?
Viruses are not composed of one or more cells
Like all theories, the cell theory is never accepted by scientists as an "absolute truth."
Which statement best explains why?
Future evidence may cause a theory to be modified or even rejected.
Based on what scientists have observed about all living things on Earth, what must be true of something found in space for it to be considered living?
It must be composed of one or more cells.
Which statement is a fundamental principle of the cell theory?
All cells come from other cells.
A scientist at the polar ice cap was studying an ice sample from hundred of meters below the surface. While examining the ice, the scientist found some cells from many years ago. Using an electron microscope, the scientist identified these cell structures: a cytoskeleton, mitochondrion, nucleus, cell wall, and ribosomes. What kind of organism did the scientist find?
Electron microscopes use electrons rather than light to view a specimen. Some of these microscopes pass a stream of electrons through a specimen. Both the stream of electrons and the specimen must be in a vacuum chamber. What is a limitation of using such an electron microscope?
Living specimens cannot be observed.
Where are you least likely to find water in the structure shown in Figure 7-4?
The discovery of cells and the development of the cell theory would not have been possible without microscopes. Which two factors are important to all types of microscopes?
magnification and resolution
Which organelle converts sugars into energy?
One part of cell theory states that cells are the basic units of structure and function for all organisms.
Robert Hooke first used the term cell in 1665. However, nearly 200 years passed before scientists developed the cell theory. Why did it take so long between the first use of the term cell and the development of the cell theory?
Scientists had to make many observations of various organisms before they could establish a theory.
Many animals have a skeleton to provide support. What do plants cells depend on for support so that the stems of the plant can remain upright?
The diagram below shows a cellular process that occurs across the cell membrane.
Which cellular process is shown in this illustration?
Which of the following organelles are found only in animals?
Both Schwann and Virchow developed important theories about cells in the mid 1800s. Which best explains the reason these theories were made within a few years of each other?
New microscopes provided better viewing of cells.
At what point in the process of diffusion is dynamic equilibrium reached?
when there is continuous movement but no change in concentration
What advantage do organelles provide eukaryotic cells that prokaryotic cells lack?
higher level of efficiency
Which of the following is an example of passive transport?
Which of the following is found in large numbers inside a cell that continuously makes proteins?
Large, polar molecules can easily pass through the lipid bilayer of cell membranes.
The illustration below shows a fertilized egg developing into different types of cells. Which part of the cell theory is supported by what is shown in this illustration?
All cells arise from existing cells.
The diagram below shows a eukaryotic cell. What structure shown in this cell would also be present in a bacterial cell?
The cell membrane that surrounds all cells is said to be semipermeable. What does this mean?
Only certain substances can pass through the cell membrane.
One function of plants cells is to use light energy to make nutrients. Which structure enables plant cells to carry out this function?
Organisms are classified based on whether they are made up of prokaryotic or eukaryotic cells. Which statement is correct about the organelles found in eukaryotic cells?
Each type of organelle has a specialized function.
Gene drew an illustration of a plant cell that he was observing under a microscope. The illustration below shows what he drew.
Which label should Gene use to identify the large structure inside the cell near the top of the illustration?
The endoplasmic reticulum has two varieties, smooth and rough.