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Module 2 DBA Biology
Terms in this set (25)
How does the pH of water compare to that of other substances? 2.01
The pH of water is neutral; it is higher than the pH of acids and lower than the pH of bases.
What would happen if the arrangement of frozen water molecule required less space than that of liquid water molecule? 2.01
The density of ice would be greater than the density of liquid water, and ice would not float.
What is a hydrogen bond? 2.01
The charged needs of one water molecule are attracted to the oppositely charges regions of its neighboring water molecule. This attraction between water molecule forms a hydrogen bond.
What causes water molecules to exhibit properties such as cohesive and adhesive behavior? 2.01
Water molecules are polar, having partially positive and partially negative ends.
What is heat capacity? 2.01
Specific heat is the amount of energy needed to change the temperature of 1 gram of a substance by 1 degree Celsius.
What is a transmission electron microscope use to view? 2.02
Transmission electron microscopes are mainly used for studying the internal structures of cells as mitochondria.
Which type of microscope had the lowest magnification power?
The dissecting microscope has the lower magnification.
How do electron microscopes and light microscopes differ in structure? 2.02
Electron microscopes use a beam of electrons instead of light to magnify images.
How a dissecting microscope differ from a compound light microscope? 2.02
A compound light microscope has much greater magnification power than a dissecting microscope.
Which type of microscope requires a nonmetal sample to be prepared for viewing y coating it with a thin layer of a conductive material such as gold?
Scanning electron microscope requires the specimen be coated with a conductive material so it can produce a 3D image of the specimens surface.
How can materials move across the cell membrane through active transport? 2.03
A protein acts as a pump and does calcium ions from a n area of low concentration to an area of high concentration. This requires the use of energy from the cell.
Rudolf Virchow's and Louis Pasteur's work resulted in significant contributions to cell theory but what thinking of the time did they prove incorrect? 2.03
Their findings contradicted the accepted belief in spontaneous generation, which was poplar at the time.
How are proteins used for active transport different from those used for facilitated diffusion?
The proteins involved in active transport must be powered by ATP to work. This means the cells much use energy in order to move the molecule across the cell membrane. In facilitated diffusion, no energy is needed.
What are the similarities between prokaryotic and eukaryotic cells? 2.03
Both cell care enclosed by plasma membranes, filled with cytoplasm, and contain small structures called ribosome. Prokaryotic cells have a cell wall, as do some eukaryotic cells. Both types of cells contain the same type of DNA molecule, which means that the genetic coding used in prokaryotic cells is the same as that used in eukaryotic cells.
What are the 3 parts of the cell theory? 2.03
1. All living things are made up of cells.
2. The cell is he basic unit of structure and function in all living things.
3. New cells can only be produced from existing cells.
What is the function of the lysosome in eukaryotic cells? 2.04
The lysosome secretes enzymes to break down large molecules.
What of the following best describes what happens after a lysosome is made in the rough endoplasmic reticulum of a plant cell? 2.04
It is sent to the Golgi apparatus for further processing.
What is a long-term effect on an organism with damaged mitochondria? 2.04
Since the mitochondria make energy for the cell, if the organism don't have the mitochondria they would suffer as its cells would be less able to provide the energy needed to carry out life functions.
What would happen if the membrane of a cell were no longer selectively permeable? 2.04
The cell would die as it would not be able to regulate which substances could enter and leave.
What is going on inside the plants' cells that causes plants to droop when it is lacking water?
The central vacuoles in the cell lose water and can no longer help support the cells. This causes the stem to droop.
What is anaerobic respiration?
Anaerobic respiration is a process that would be used to produce small amounts of ATP in the absence of oxygen.
How is excess energy (ATP) stored in animals?
In animals, excess energy is stored as fat.
During the process of photosynthesis, what would happen if the concentration of hydrogen ions (H+) outside of the thylakoids were equal to the concentration of H+ inside the thylakoids, how would it affect the chloroplasts?
The chloroplasts would be unable to generate ATP.
Why does darkness affect the light-independent reactions of photosynthesis?
Light independent reaction require the energy gathered in the thylakoids.
How did these oxygen atoms originally enter the plant?
They were part of the water molecules (H2O) pulled in through the roots during the light dependent reaction of photosynthesis.
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