3. What are the functions of ribosomes?
4. What is the function of mitochondria?
5. Do plant cells contain centrioles?
6. Name the nucleic acid found in chromosomes.
7. What is the role of the Golgi complex?
8. Name the following:
(a) structural and functional unit of life
(b) powerhouse of the cell
(c) kitchen of a cell
Answers
Answer:
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Explanation:
3/-Ribosomes have two main functions — decoding the message and the formation of peptide bonds. These two activities reside in two large ribonucleoprotein particles (RNPs) of unequal size, the ribosomal subunits. Each subunit is made of one or more ribosomal RNAs (rRNAs) and many ribosomal proteins (r-proteins).
4)-The most prominent roles of mitochondria are to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP), through respiration, and to regulate cellular metabolism. The central set of reactions involved in ATP production are collectively known as the citric acid cycle, or the Krebs cycle.
5)-While both animal and plant cells have microtubule organizing centers (MTOCs), animal cells also have centrioles associated with the MTOC: a complex called the centrosome. Animal cells each have a centrosome and lysosomes, whereas plant cells do not.
6)-Deoxyribonucleic acid
Along with RNA and proteins, DNA is one of the three major macromolecules that are essential for all known forms of life. Within cells, DNA is organized into long structures called chromosomes.
7)-The golgi apparatus is a membrane bound organelle found in most cells. It is responsible for packaging proteins into vesicles prior to secretion and therefore plays a key role in the secretory pathway.
8)-a)-The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life
b)-Work on mitochondria did not stop in the 1950s after it was named “the powerhouse of the cell.” Subsequent studies throughout the rest of the 20th century identified the mitochondria as an incredibly dynamic organelle involved in multiple cellular processes in addition to energy production.
c)-Chloroplasts are present in green algae and higher plants. They have a green pigment called chlorophyll and they are involved in the photosynthesis of food. Therefore they are also known as the 'kitchens of the cells'. ... it contains a large variety of photosynthetic enzymes, starch grains DNA and ribosomes.
Answer:
3. The function of Ribosomes are protein synthesis and also required for many cell activities .
4. The function of mitochondria is known as power house of cell as it provides energy for essential functions.
5.centrioles are present in lower plants and absent in higher plants.
6. Deoxyribonucleic acid along with RNA and proteins are found in chromosomes.
7.The role of the Golgi complex is storing and packaging of materials and secretions.
8
(a) cell
(b) mitochondria
(c) Chloroplast.