Living environment midterm
In a cell, information that controls the production of proteins must pass from the nucleus to the
ribosomes
What Is the main function of a vacuole in a cell?
storage
The diagram represents a plant cell in tap water as seen with a compound light microscope. Which diagram. Best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?
Diagram 3
Arrows A,B, and C in the diagram below represent the processes necessary to make the energy stored in food available for muscle activity Food ->(A) simpler molecules ->(B) mitochondria ->(C) ATP in muscle cells The correct sequence of processes represented by A,B, and C is
Digestion -> diffusion -> cellular respiration
The largest amount of DNA in a plant cell is continued in
A nucleus
A wet mount of red onion cells as seen with a compound light microscope is shown to the right A) using the accompanying circle, sketch what cell A would look like after the addition of the salt. B) which substance would most likely be used to return the cell to its original condition?
A) B) distilled water
In the diagram, the dark dots indicate small molecules. These molecules are moving out of the cells, as indicated by the arrows. The number of dots inside and outside of the two cells represents the relative concentrations of the molecules inside and outside of the cells A) ATP is being used to move the molecules out of the cell by B) identity the structure responsible for the synthesis of ATP
A) cell A, only B) mitochondria
The diagram below shows molecules represented by X both outside and inside of a cell. A process that would result in the movement of these molecules out of the cell requires the use of
ATP
The process of active transport requires the most direct use of
ATP
In the cell shown below, which lettered structure is responsible for the excretion of most cellular wastes?
B
The diagram below represents a portion of a cell membrane. Which structure may function in the recognition of chemical signals?
B
Which letter indicates a cell structure that directly controls the movement of molecules into and out of the cell?
B
The diagram below shows the relative concentration of molecules inside and outside of a cell. Which statement best describes the general direction of diffusion across the membrane of this cell?
Carbon dioxide would diffuse out of the cell
Damage to which structure will most directly disrupt water balance within a single-called organism
Cell membrane
In the human body, oxygen is absorbed by the lungs and nutrients are absorbed by the small intestine. In a single-celled organism, this absorption directly involves the
Cell membrane
Recently, researchers from Stanford university have changed mouse skin cells into mouse nerve cells. This was accomplished by inserting genes that control the synthesis of certain proteins into the skin cells. This type of research is often successful in advancing knowledge regarding the functioning of human cells because
Cells present in humans often function similar ways to cells present in other organisms
Which diagram best represents the levels of organization in the human body?
Cells, tissues, organs, organ system (inside to outside)
An enzyme known as rubisco enables plants to use large amounts of carbon dioxide. This enzyme is most likely active in the
Chloroplast
When using a compound light microscope, the most common reason for staining a specimen being observed is to
Reveal details that are otherwise not easily seen
Which organelle is correctly paired with its specific function?
Ribosome- synthesis of proteins
Which row in the chart below best describes the active transport of molecule X through a cell membrane?
Row- 3 Movement of Molecule X - low concentration -> high concentration ATP - used
A red onion cell has undergone a change, as represented in the diagram below
Salt water
Which statement describing the cells in a body system Is correct?
Some cells in the system may be different from the other cells in the system, but all cells are coordinated and work together
The function of a cell depends primarily on its
Structure
Which statement regarding the functioning of the cell membrane of all organisms is not correct?
The cell membrane forms a barrier that keeps all substances that might harm the cell from entering the cell
The current knowledge concerning cells is the result of the investigations and observations of many scientists. The work of these scientists forms a well-accepted body of knowledge about cells. This body of knowledge is an example of a
Theory
Which cell structure contains information needed for protein synthesis?
1
The diagram below represents two cells X and Y. Which statement is correct concerning the structure labeled A?
It's aids in the removal of metabolic wastes in both cell X and cell Y
In a cell, all organelles work together to carry out
Metabolic processes
An organelle that releases energy for metabolic activity in a nerve cell is the
Mitochondrion
Homeostasis in unicellular organisms depends on the proper functioning of
Organelles
Which structure carry out life function within cells?
Organelles
Which sequence represents the correct order of levels of organization found in a complex organism?
Organelles -> cells -> tissues -> organs -> organ system
Humans require organ systems to carry out life processes. Single-celled organisms do not have organ systems and yet they are able to carry out life processes. This is because
Organelles present in single-celled organisms act in a manner similar to organ systems.
An investigation was set up to study the movement of water through a membrane. The results are shown in the diagram. Based on these results, which statement correctly predicts what will happen to red blood cells when they are placed in a beaker containing a water solution in which the salt concentration is much higher than the salt concentration in the red blood cells?
The red blood cells will lose water and decrease in size
Which set of functions is directly controlled by the cell membrane?
active transport, recognition of chemical messages, protection