16. Which of the following types of molecules are the major structural component
ID: 272624 • Letter: 1
Question
16. Which of the following types of molecules are the major structural components of the cell membra ne? A) phospholipids and cellulose D) nucleic acids and proteins E) proteins and cellulose C) glycoproteins and cholesterol 17. Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? A) CO 18. When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur? B)an amino acid C)glucose D) K E) starch A) The cell will burst D) The cell will become flaccid. E) The cell will become turgid B) The cell membrane will lyse. C) Plasmolysis will shrink the interior 19. Which of the following types of reactions would decrease the entropy within a cell? A) anabolic reactions B) hydrolysis C) respiration 20. Some bacteria are metabolically active in hot springs because D) digestion E) catabolic reactions A) they are able to maintain a lower internal temperature. B) high temperatures make catalysis unnecessary C) their enzymes have high optimal temperatures D) their enzymes are completely insensitive to temperature. E) they use molecules other than proteins or RNAs as their main catalysts 21. When a molecule of NAD" gains a hydrogen atom (not a proton), the molecule becomes A) dehydrogenated. B) oxidized. D) redoxed. E) hydrolyzed C) reduced 22. Which process in eukaryotic cells will proceed normally whether oxygen (02) is present or absent? A) electron transport B) glycolysis C) the citric acid cycle Dj oxidative phosphorylation E) chemiosmosis 23. In cellular respiration, the energy for most ATP synthesis is supplied by A) high energy phosphate bonds in organic molecules. B) a proton gradient across a membrane. C) converting oxygen to ATP D) transferring electrons from organic molecules to pyruvate. E) generating carbon dioxide and oxygen in the electron transport chain. 4. The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is A) oxygen B) water C) NAD D) pyruvate. E) ADP 5. Most CO2 from catabolism is released during A) glycolysis. B) the citric acid cycle. C) lactate fermentation. D) oxidative phosphorylation. . Where does the Calvin cycle take place? A) stroma of the chloroplast B) thylakoid membrane C) cytoplasm surrounding the chloroplast D) interior of the thylakoid (thylakoid space) E) outer membrane of the chloroplast The light reactions of photosynthesis supply the Calvin cycle with A) light energy. B) CO, and ATP C)H,0 and NADPH. D) ATP and NADPH. E) sugar and O Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding? A) hormonal signaling B) autocrine signaling C) paracrine signaling D) endocrine signaling E) synaptic signalingExplanation / Answer
Answer=
16] Major structural components of cell membrane are
B]Phospholipids and proteins
explaination- The cell membrane mainly composed of lipids and proteins .lipids are present 55% & proteins 46%.
some amount of carbohydrates are also present in the cell membrane.
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17] The molecule which move through lipid bilayer of cell membrane most rapidly is
A]CO2
explaination-CO2can directly diffuse through the lipid bilayer of cell membrane.
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18]A plant cell when submerged in a very hypotonic solution then
E]The cell will become turgid.
explaination- when A plant cell when submerged in a very hypotonic solution it takes up the water by the process of osmosis and starts to swell ,but the cell wall prevents it from bursting.
the plant cell is said to have turgid i.e.swallon and hard.
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