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Science 2
| Question | Answer |
|---|---|
| What are cells? | Cells are the basic subunits of all living things. |
| What is the objective ? | The objective is the type of lens used in a microscope? |
| How are cells similiar? | All cells have a cell membrane, organelles, cytoplasm, and DNA. |
| How are cells different? | They are different because all cells have a different structure and function which living things depend on. There are two main types of cells Eukaryotic cells and Prokaryotic cells. |
| How has the development of the microscope helped us to increase our knowledge of cells? | The Invention of the Microscope helped the development of the cell theory because it allowed the scientists to actually discover that everything was made up of cells, and what cells do to come up with that theory. |
| How do cells work? | They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. |
| How do cells divide? | The chromosomes shorten and the nucleoli disappear, the membrane breaks down, chromosomes grow, DNA is placed in pairs, chromosomes separate evenly to both sides, the chromosomes loosen and grow longer, nuclear membrane forms and nucleoli reappear. |
| How is a unicellular organism different from a multicellular organism ? | The main differences is the body of the unicellular organism is composed of a single cell whereas the body of the multicellular organism is composed of numerous cells. A unicellular organism is irregular in shape with asimple organization wheras a multice |
| Who was the first person to see cells? | Robert Hooke was the first person to see cells. He remarked that it looked like small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope. |
| What is an electron microscope? | Transmission electron microscopes pass beams of electrons, rather than light, through the specimen. Which allows higher magnification to achieve a clearer image. A scanning electron microscope produce 3D images. |
| What are the good bacteria's? | Good bacteria like E-coli, gut, lactobacillus and streptococcus species. |
| What unit is used to measure a cell?How big is it it? | A micrometre is used to measure a cell, it is equivalent to one thousandth of a millimetre or one millionth of a metre. |
| What is the purpose of using a stain in a wet mount? | The main purpose of staining is to highlight cells and parts of cells. Over 20 different types of stains exist, and the type of stain you use depends on what you are looking for. |
| Which kingdoms are made up of prokaryotic organisms? | Monera is the only prokaryotic kingdom. The Monera Kingdom consists of all bacteria. Bacteria are one-celled organisms that are made of simple components. They often lack a nucleus and cell membrane. Bacteria are universal they can be found everywhere. |
| What are the organelles found in an animal cell? | The organelles found in an animal cell are cell membrane, cytoplasm, chromosomes, nucleus, nuclear membrane, vacuole, ribosomes and mitochondria. |
| What extra organelles do plant cells have? | Plant cells have chloroplasts and cell walls whereas animals don't. |
| Why is a cell membrane important to a cell? | The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells. The basic function of the cell membrane is to protect the cell from its surroundings. |
| What is the cell theory? | The cell theory is that all living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. |
| Why are cells so small? | Cells are small because membranes are weak. If the cell gets too big, the cell will fall apart. |
| How are cells, tissues, and organs related to systems? | In the human body, cells are the basic units of life. Groups of cells working together for a specific function form tissues. Organs are two or more tissues operating together. Organs working together, form body systems. |
| What is the role of saliva? | Functions of saliva include moistening food and helping to create a food bolus so it can be swallowed easily. Saliva contains the enzyme amylase that breaks starches down into maltose and dextrin. The first step to food digestion occurs in the mouth. |
| Why do humans have different kinds of teeth? | Humans have four different types of teeth because they all have specific functions and parts that help digest and crush the food before being swallowed. |
Created by:
gunthel
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