lization of subcellular structure. Match the tis- cell structures and organelles
ID: 205024 • Letter: L
Question
lization of subcellular structure. Match the tis- cell structures and organelles listed to the rigt in these cells Use your text for a description with the letter of the would and anelles or structures that are unfamillar to you Tissues . Enzyme (protein)-secreting Cell Structures cells of the pancreas and Organelles a. plasma membeane b. mitochondria c. Golgi apparatus d, chloxoplastlum e. endoplasmic reticulum f. cilia and flagella g vacuole h. ribosome Insect flight muscles - Cells lining the respiratory passages - White blood cells that engulf and destroy invading bacteria Leaf cells of cacti 4. One organism found in a termite's gut is Mixotricha paradoxa. This strange creature looks like a single-celled swimming ciliate under low magnifica- tion. However, the electron microscope reveals that it contains spherical bacteria rather than mitochondria and has on its surface, rather than cilia, hundreds of thousands of spirilla and bacilla bacteria. You are the scientist who first observed this organism. How would you describe thits organism-single-celled? aggregate? colony? multicellular? Review defi- nitions of these terms in the introduction to Exercise 2.5. Can the struc- ture of this organism give you any insight into the evolution of eukaryotic cells? (Hint: See the discussion of the endosymbiosis hypoth- esis in your text.) Gel matrix Somatic cell Pleodorina is an aquatic green algae that is common in ponds, lakes, and roadside ditches (Figure 2.13). This organism is made up of 32 to 128 cells that are embedded in a gel-ike matrix. In mature colonies two types of cells can be distinguished, small somatic cells and larger reproductive cells that divide to form new colonies. Somatic cells carry on photosynthesis, but may become reproductive if isolated from the colony. 5. Review the criteria used to determine multicellularity, and decide if Pleodorina should be classified as multicellular or colonial. Reproductive cells FIGURE 2.13Explanation / Answer
Enzyme secreting cells of the pancreas essentially comprises of endoplasmic reticulum, golgi bodies and ribosomes. ER, golgi bodies are crucial for the modification and transport of proteins whereas ribosomes are essential for their synthesis. So, the answer is c, e, h.
Insect flight muscles seem to require a lot of energy. So, mitochondria would be abundant in these type of cells. So, the answer is b.
Cells lining the respiratory passages are essentially seen to comprise of cilia. So, the correct answer is f.
White blood cells that invade and destroy bacteria are known as macrophages. They are known to comprise of vacuoles that engulf the bacteria, lysosomes that lyse the bacteria with the help of enzymes. So, the answers are g and i.
Leaf cells of cacti comprise mostly of chloroplsts which are necessary for photosynthesis and food preparation by the plant. So, the answer is d.
All the cells above are lined by plasma membrane.
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