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Wiles--Cell Review
Wiles--Module 7--Cellular Structure
Question | Answer |
---|---|
What is the definition of a cell? | Basic unit of life |
What three scientists are given credit for stating the cell theory? | Schleiden, Schwann, and Virchow |
What was the name of the substance inside a rbc that carries oxygen? | Hemoglobin |
What are the most numerous organelles in a cell? | Ribosomes |
What is the largest cell in the human body? | Ovum (egg cell) |
Who first used the word "cell" while looking at slices of cork under a microscope? | Robert Hooke |
What is the function of ribosomes? | Synthesize or produce protein |
Humans are referred to as ____ since they are made of many cells? | Multicellular |
What is the study of cells called? | Cytology |
What are the folds of the inner membrane of a mitochondrion called? | Cristae |
What organelles are often called "suicide sacs"? | Lysosomes |
What does organelle literally mean? | little organ |
A group of cells that live together in close association for a common existence makes a(n) ___. | Colony |
What process takes place in the chloroplasts of plant cells? | Photosynthesis |
What material is a plant's cell wall primarily composed of? | Cellulose |
What cellular organelle is the packaging, processing, and secreting organelle of the cell? | Golgi apparatus |
What organelle synthesizes (makes) ribosomes? | Nucleolus |
A group of organs working together to perform a common function is a(n) ______. | System |
Tiny, hair-like extensions on the outside of a cell used for movement are _____. | Cilia |
What phrase describes the cell membrane since it allows some substances to pass but prohibits others? | Selectively permeable or semi-permeable |
What cellular organelle is missing in a mature red blood cell that is normally present in animal cells? | Nucleus |
What word means "one celled"? | Unicellular |
What organelle stores the green pigment in plant cells? | Chloroplast |
Which type of cell would have more mitochondria? muscle or fat | Muscle |
What cellular organelle stores water, waste, etc.? | (Central) vacuole |
What type of tissue did we scrape from the inner surface of our mouth? How is its cell's shape related to function? | Epithelial tissue. Cells in epithelial tissue are flat and platelike for covering and protecting. |
What cellular organelle allows a sperm cell to move? | Flagella |
What cellular process builds or makes molecules? | Synthesis |
What cellular process releases energy in the form of ATP from organic molecules in food? | Cellular respiration |
What cellular organelle is also called the "powerhouse" of the cell? | Mitochondria |
Compare and contrast chromatin and chromosomes. | Both are the mixture of protein and nucleic acids within a cell. Chromatin is the scattered form that occurs between cell divisions. Chromosomes are the coiled and condensed form that forms during cell division. |
Bacteria are termed _____ since they do not have a nucleus or other membrane bound organelles. | Prokaryotes |
What cellular organelle acts as an intracellular highway to transport molecules within a cell? | ER |
They jelly-like material that suspends all of a cell's organelles is the ______. | Cytoplasm |
Name the two types of ER and differentiate between them. | Rough ER have ribosomes on their outer surface, while smooth ER do not have ribosomes on their outer surface |
What type of tissue is specialized for transmitting messages? | Nervous |
List the biological levels of organization from simplest to most complex. | Cell-tissue-organ-organ system |
What cellular process breaks down food into a usable form? | Digestion |
What factor limits the size of cells? | Surface area to volume ratio |
What was the name of the colonial algae we looked at in class | Volvox |
What are the membranous tubes that make up ER and Golgi apparatus? | Cisternae |
What two types of molecules primarily compose the cell membrane? | Phospholipids and proteins |
Define bilayer. How it is used in the Fluid Mosaic Model. | Bilayer means 2 layers; the cell membrane is a bilayer of phospholipids. |
What are the three statements of the cell theory? | All living organisms are made of 1 or more cells. Cells come from other living cells. The cell is the basic unit of structure and function. |
What organelle carries on cellualar respiration? | Mitochondria |
Who is given credit for observing the first living cells? | Antony van Leeuwenhoek |
Define eukaryote. Give an example. | An organism whose cells have a nucleus and other membrane bound organelles. You, dog, cat, oak tree, mushroom, yeast, protist. |
What organelle is it? Occurs in large numbers on the outside surface of the cell to move fluid or the cell itself? | Cilia |
Several tissues working together to perform a specific job constitute a(n) ____. | Organ |
What is purpose of the mitochondria having the cristae? | To increase the surface area of the inner membrane where ATP is released |
How many chromosomes do normal humans possess in their body cells? | 46 |
What organelle can occupy 90% of a plant cell? | Central Vacuole |
What is the outermost living part of a plant cell? | Cell membrane |
What is the function of the cell wall in plant cells? | To provide rigidity, structure, and support. |
The heads of the phospholipids in the cell membrane are termed ___ in response to water. | Hydrophilic |
What are the two types of proteins associated with the cell membrane? | Integral (for transport) and peripheral (for structure & receptros) |
What type of a plastid in a tomato cell stores the yellow and red pigments? | Chromoplasts |
What is the name of the model used to describe the cell membrane? | Fluid Mosaic Model |
Why did Robert Hooke use the term "cell" when viewing cork under a microscope? | The little boxes reminded him of rooms in a monastery |
What are the flattened membranous sacs within the chloroplasts called? | Thylakoids |
Give a function of the cytoskeleton of a cell. | To help move organelles within the cytoplasm and provide support; provide structure within a cell |
What are the 2 types of protein strands that make up the cytoskeleton of a cell? | Microfilaments and microtubules primarily (also intermediate fibers) |
What cellular organelle is analagous to the brain of a human? | Nucleus |
What is enclosed within the membrane of the lysosome? | Digestive enzymes |
What is the composition of cilia and flagella? | 9 pairs of microtubules arranged around a central pair |
What is the first cell of a human called which forms from the union of sperm and egg? | Zygote |
Humans are: multicellular or unicellular, autotrophic or heterotrophic, eukaryotes or prokaryotes. | Multicellular, heterotrophic, eukaryotes |
What structure of a microscope is responsible for regulating the amount of light reaching the specimen? | Diaphragm |
What is another name for the eyepiece of a CLM? | Ocular |
How do you calculate total magnification of a CLM? | Ocular lens x objective lens |
What two parts of a microscope are used to properly carry it? | One hand on the base and the other hand on the arm |
What type of organisms did Antony van Leeuwenhoek observe as the first living cells? In what did he view these? | Protists such as Spirogyra and Vorticella in pond water and stagnated rain water; bacteria |
The ability of an organism to maintain a stable internal environment is referred to as maintaining ___________. | homeostasis |
Cells are able to react to stimuli through a cellular process known as ____. | response or responding |
How do you calculate volume of a cube? | l x w x h |
How do you calculate surface area of a cube? | 6(l x w) |
Prokaryotic cells lack a nucleus. Then, how is control of the cell maintained? | nucleoid (nucleus like area in the cell that houses the DNA) |
What are the primary parts to a phosopholipid? | Hydrophilic head made of glycerol and phosphate as well as two hydrophobic "tails" made of fatty acid chains |
Give 2 purposes for the proteins within the cell membrane. | Act as a cell surface marker; act as carriers in transporting molecules across the cell membrane |
What cellular organelles are found in animal cells to organize the microtubules during cell division to help in chromosomove movement? | centrioles |
Explain why prokaryotic cells lack certain organelles such as mitochondria, ER, and Golgi apparatus but contain certain organelles such as ribosomes. | Prokaryotic cells do not have membrane bound organelles. The mitochondria, ER, & Golgi apparatus are bound by membranes, but the ribosomes are not. |
What type of an electron microscope creates an image where the inside of the cells are visible? | Transmission electron microscope (TEM) |
What factor makes the CLM unusable for very small organisms? | Due to light's properties, resolution is limited. At 1000-2000X, images become so blurry that EM's have to be used. |
What material is a prokaryotic cell wall made of? | peptidoglycan |
True or false? TEM's and SEM's can be used with living or dead specimens. | False. TEM's and SEM's can only be used with dead specimens due to the preparation that must be done to the specimens for use with each. |
Instead of lenses, EM's use _______ to aim and focus a beam of electrons. | magnets |
The study of life is known as ________. | biology |
The study of all chemicals needed to maintain life is called ______. | biochemistry |
Give two advantages of an electron microscope over an optical (light) microscope. | Much greater magnification and much better resolution. For instance, most CLM's can only magnify 1000X-2000X whereas the TEM can magnify up to 500,000X |
The stable internal environment that the body strives to maintain is called ___________. | homeostasis |