cell test
All cells contain cell membranes. Which of the following describes the composition of cell membranes?
Cell membranes are composed of lipid molecules, which provide a flexible structure.
A cell is placed in an isotonic solution. How does the cell maintain homeostasis in this environment?
Water will move across the cell membrane in both directions because the concentrations of solute particles inside and outside the cell are the same.
Alexis is using models of the cell membrane to compare the types of cellular transport. One model shows a molecule entering through a protein pump. Which type of cell transport is being modeled?
Active transport, because protein pumps are needed to move substances against a concentration difference
Which of the following statements is part of the cell theory?
All cells are produced from existing cells.
Structure Cell 1 Cell 2 DNA Located in cytoplasm Located in nucleus Cell membrane Present Present Cell wall Present Absent Mitochondria Absent Present Ribosomes Present Present
Cell 1 is prokaryotic; Cell 2 is from an animal.
Which is a property of all unicellular organisms, but not all multicellular organisms?
Cells can survive independently of one another.
Which two types of structures are present in a plant cell, but not in an animal cell?
Chloroplasts and Cell Wall
The cells of all organisms contain DNA. In cells of which of the following groups is the cellular DNA enclosed in a nucleus?
Eukaryotes
Lysosomes are organelles that contain enzymes. Which of the following is a function of lysosomes?
Lysosomes break down lipids, carbohydrates, and proteins.
A number of scientists made contributions to cell theory. Which scientist was the first to use a light microscope to observe cells in a slice of cork?Which of the following structures are typically present in both plant and animal cells?
Robert Hooke
Homeostasis is a characteristic of all living things. Which of the following is a way that multicellular organisms can maintain homeostasis but unicellular organisms cannot?
The cells of multicellular organisms can differentiate into specialized cells.
Multicellular organisms contain organ systems. Which of the following BEST describes the organs in an organ system?
The organs in an organ system work together to perform a specific function.
Which of the following structures occurs in cells of all types, including prokaryotic cells and eukaryotic cells?
a cell membrane made of a lipid bilayer
Which type of cell structure is included in all three cells?
cell membrane made of a lipid bilayer
According to the cell theory, what is the source of all new cells?
pre-existing cells
Nayla is planning an investigation on the role of osmosis in maintaining homeostasis. She plans to study red blood cells in a liquid suspension, similar to blood plasma. For Nayla to observe the greatest variety of osmotic activity in the red blood cells, she should test the effect of which of these independent variables?
salt concentration of the liquid that surrounds the red blood cells
Microscopes can be used to explore cells. Which of the following types of microscopes is used to produce a three-dimensional image of the surface of a cell?
scanning electron microscope
Stewart is investigating the responses of plants to their environment. As part of the investigation, he studies a plant that receives sufficient water and has straight, upright stems and firm leaves. He also studies another plant that was grown in dry soil, and that has wilted stems and leaves. When Stewart examines the cells of the plants under a microscope, which organelle will display the greatest difference between the two plants?
the central vacuole, because it stores water and provides support
Which organelles allow plants to support heavy structures such as leaves and flowers?
the vacuoles because they are filled with fluid, which provide rigidity
