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The exoskeleton is composed of thin fiberous elements that form a framework for the cell
Who was the first scientist to describe living cells as seen through a simple microscope
Anton van Leevwenhoek & Robert Hooke
True or False: The plasma membrane is a bilayer of lipid molecules with protein molecules embedded in it
What cell structures make plant and animal cells different
Plant- Cell Wall,Chloroplast, Vacuole
Animal- Lysosomes, Flagella, Centrioles
What happens to a higher concentration of disolved molecule on one side of a cell membrane during the process of diffusion
The higher concentration begins to defuse into the area with lower concentration.
True or False: The structure and properties of the cell wall allow it to be selective and maintain homeostasis
True or False: The plasma membrane can contain cholesterol, which tends to make the membrane more stable
Place the following in order from smallest to largest level of organization
(Tissue, Organ, Organ System, Individual Cells, Organism)
Individual Cell, Tissue, Organ, Organ System, Organism
(Cells make up tissue, tissues make up organs, organs make up organ systems, organ systems make up organisms)
Compare and Contrast endocytosis and exocytosis
Endocytosis-process by which cells absorb molecules (such as proteins) from outside
Exocytosis- Cells direct the contents of secretory visels out the cell membrane
Describe the structure of a phospholipid
Made up of a head and 2 fatty acid tails.
Head- phosphate and glycerol (hydrophilic)
Tail- fatty acid (hydrophobic)
Plants have cells that contain chloroplast. Why must their cells contain mitochondria as well
Chloroplast- makes food by trapping light energy to convert water and carbon dioxide to form oxygen and glucose (photosynthesis)
Mitochondria- provides energy for the cells use by extracting the energy from glucose molecules and storing ATP
How are phospholipids arranged in the plasma membrane
In a dual layer, the tails are facing toward each other. The head i son the outer surface
True or False: Transport proteins span the cell membrane allowing the selectively permeable membrane to regulate which molecules enter and leave a cell
What is the functions of cholesterol molecules
help membrane maintain homeostasis at very high temperatures. Cholesterol keeps fatty acid tails from touching
True or False: The fluid mosiac model describes the plasma membrane as a structure that is liquid and very rigid
Cilla and Flagella are cell surface structures that are adapted for respiration
What scientist observed that cork was composed of tiny hollow boxes that he called cells
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