The atom is the basic structural and functional unit in the body. Cells producin
ID: 56112 • Letter: T
Question
The atom is the basic structural and functional unit in the body. Cells producing large quantities of ATP would probably contain many ribosomes. Fats and fat-soluble molecules readily move into and out of cells. Carbohydrates arc primarily associated with the outer surface of the cell membrane. Phagocytic cells demonstrate ameboid movement and pseudopodia formation. Pinocytosis is the exocytosis of fluid. Receptor-mediated endocytosis would allow cells to selectively remove molecules from the extracellular fluid. Cilia and flagella have the same arrangement of microtubules. The cytoplasm lacks internal organizational and structural support. Primary lysosomes consist of hydrolytic enzymes and the contents of a food vacuole. All of the DNA within a cell is normally found in the nucleus. Cells lacking granular (rough) endoplasmic reticulum would be unable to synthesize proteins.Explanation / Answer
1. False. Atom is the smallest unit of matter. A number of molecule collabrate to from a molecule. On the other hand, cell is the basic unit of body. A collection of cell forms a tissue and collection of tissue forms a organ.
2. False. Ribosomes are mainly responsible for the protein formation. The cell organelles responsible for energy are mitochondria.
3. False. Cell membrane is bilayer in nature, hydrophilic from outside and lipophilic from inside. lipids having small molecular weight is accessible to cell membrane but lipid compound and high molecular weight charged molecules are impermeable to cell membrane.
4. True. Carbohydrate is mainly present in the outer surface of the cell membrane as glycoprotein.
5. True. Phagocytic cells protect the body from pathogens by ingesting them throgh pseudopodia formation and amoeba like movement.
6. False. Pinocytosis is the endocytosis of small molecules & ions on the other hand exotysosis is the extrusion of waste product to the surrounding of the cell.
7. True. Receptor mediated endocytosis is a process in which particular molecules are ingested into the cell. The specificity depends on the receptor-ligand interaction. Receptors on the surface of the target tissue will typically bind to ligands on the outside of the cell.
8. True. Almost all eukaryotic cilia and flagella are having similar structural organization and possess a central bundle of microtubules named as axoneme. This axoneme consists of nine outer doublet microtubules surround a central pair of singlet microtubule.
9. False. The cytoplasm is the fluid present between the plasma membrane and the nuclear envelope. The fibrous proteins that occur in the cytoplasm serve as the cytoskeleton as well as maintain the shape of the cell. Other functions includes, anchoring of organelles, moving the cell and controlling internal movement of structures.
10. True. Lysosomes are large vesicles formed by the Golgi. They contain hydrolytic enzymes which are able to destroy the cell.
11. True. Deoxyribonucleic acid (DNA) is the carrier of inheritance that transfers from parent cell to its progeny. All of the DNA is normally present in the nucleus except the plastid DNA which founds in chloroplast and mitochondria.
12. True. Endoplasmic reticulum is a web of interconnected membranes, mainly responsible for protein synthesis and transport. Rough endoplasmic reticulum attached to the nuclear envelope through which the messenger RNA travels to the ribosomes and helps in translation. Hence the cell lacking rough endoplasmic reticulum unable to produce protein.
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