What is actually happening when you forget to water your house plants and they w
ID: 96745 • Letter: W
Question
What is actually happening when you forget to water your house plants and they wilt? Select one: a. Plant cells' central vacuole s shrinking, decreasing turgor pressure b. Plant cell's central vacuole is expanding, increasing turgor pressure c. There is a net movement of water into the plant cells d. A and C e. They are saddened by your insensitivity to their needs What is the most accurate description of all cell membranes? Select one: a. A layer of phospholipids with some proteins embedded in them b. A layer of proteins with some phospholipids embedded in them c. Two layers of phospholipids with some proteins embedded in them d. A layer of cholesterol with proteins embedded in them e. None of these apply to all cell membranes When a drop of red dye is added to a beaker of room temperature water (think of demo in lab) the dye eventually spread out uniformly in the beaker of water. This process illustrates which type of movement? Select one: a. Active Transport b. Osmosis c. Diffusion d. Facilitated Diffusion e. Oxidation What organelle(s) in eukaryotic cells is/are believed to have evolved from prokaryotic cells? Select one: a. Lysosomes b. Mitochondria c. Golgi Apparatus d. Chloroplasts e. B and D Which group of biological molecule is the main component of all cell membranes? Select one: a. Carbohydrates b. Lipids c. Proteins d. Nucleic acids e. DNAExplanation / Answer
answer-11: part (a) is correct; Due to dessication, the water moves out from vacuole and turgor reduces hence plant get wilted. vacuoles serve as reservoir of water, in water deficit condition vacuoles get shrinked.
answer 12: correct part is c; cell membrane is composed of 2 layers of phospholipid with some proteins (intrinsic and extrinsic); cell membrane can be split apart into single sheet of phospholipid. These sigle sheets are arranged in a manner that hydrophobic part interact togather through tail to tail interacteraction.
answer 13: answer is diffusion; whenever we add any dye to water its spreads throughout the solution from higher concentration of dye to its lower concentration, this is diffusion. Movement of a molecule from higher concentration to its lower concentration is called as diffusion.
14: answer is b and d; mitochondria and chloroplast have evolved from prokaryotes because :
1. they have 70S ribosome like bacteria.
2. these organelles have genomic DNA similar to bacteria i.e. circular DNA instread of linear.
3. they multiply by fission (divide into two) to reproduce.
15. cell membrane is composed of lipid, protein and carbohydrate, out of which they comprise 40, 50 and 10 % of amount. so proteins are major componet of membrane.
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