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The Archaeal cell membrane contains ---------------- lipids made up of ------------------- subunits.
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- 1) Placing phospholipids in water will spontaneously form a spherical structure called a:Group of answer choices lumen ball sphingoid cytoskeleton liposome 2) Saturated fatty acidsGroup of answer choices Have each carbon "saturated" with hydrogen Have each carbon "saturated" with other carbons Have each carbon "saturated" with hydrogen and are solids at room temperature Are solids at room temperature Contain double bonds 3) In intestinal epithelia, glucose can be taken into cells against its concentration gradient. How can glucose be transported against its concentration gradient without the direct expenditure of ATP in intestinal epithelial cells?Group of answer choices It uses simple diffusion It uses the Glut1 transporter It uses the Glucose ATPase It uses the Glucose/Na+ symporter None of the above. Due to the Second Law of Thermodynamics, molecules cannot be moved against their concentration gradient.What is the type of cell membrane side chain of lipids of: 1. Archaea 2. Bacteria 3. EukaryaA student uses iodine to visualize cells under the light microscope. Iodine stains starch deep blue and glycogen granules dark brown. Observation of the cells reveals the presence of cell walls, dark brown granules, mitochondria, and a prominent nucleus. If the chemical composition of the cell wall is determined, which of the following molecules would MOST likely be the major constituent? A. cellulose B. chitin C. lignin D. peptidoglycan
- Which of the following correctly describes micelles? spherical structures formed by amphipathic lipids such as fatty acids same as liposomes b) produced spontaneously by certain lipids, particularly glycerophospholipids c) composed of lipid bilayers that wrap around to form spherical vesicles consist of multi-layered structures of lipid bilayersWhich of the following best describes the lipid aggregates known as liposomes? A. They contain a hollow non-aqueous interior cavity. B. They are spherical structures with their hydrophobic regions aggregated in the interior cavity. C. They form because the cross-sectional area of the head group is greater than that of the acyl side chain(s). D. They are derived from a bilayer sheet.Which polysaccharide is usually found in the cell walls of fungi? a. starch b. glycogen c. chitin d. cellulose
- Which of the following statements is true? Select one: O a. Gram-positive bacterial walls have a relatively thin layer of peptidoglycan anchored to the acids O b. Peptidoglycan is a fatty acid O c. The cell walls of bacteria are composed of peptidoglycan O d. Peptidoglycan is found mainly in the cell walls of fungi, algae and plantsWhat is the order of the molecules on the following list according to their ability to diffuse through a lipid bilayer, beginning with the one that crosses the bilayer most readily. 1. Ca²+ 2. CO₂ 3. Ethanol 4. Glucose 5. RNA 6. H₂O A. Ethanol, Glucose, CO₂, H₂O, RNA, Ca²+ B. CO₂, Ethanol, Glucose, H₂O, Ca²+, RNA C. RNA, Glucose, Ethanol, H₂O, CO₂, Ca²+ D. Ca²+, CO₂, H₂O, Ethanol, Glucose, RNA *Recall that RNA stands for ribonucleic acids, and acids are negatively charged molecules in solutionGram-positive eubacterial cells (like Clostridium perfringens) contain which components? a cell wall made of pseudomurein, and membrane fatty acids ester-linked to glycerol (G-3-P lipids) a cell wall made of peptidoglycan, and membrane alcohols ether-linked to glycerol (G-1-P lipids) a cell wall made of cellulose, and membrane alcohols ether-linked to glycerol (G-1-P lipids) a cell wall made of pseudomurein, and membrane alcohols ether-linked to glycerol (G-1-P lipids) a cell wall made of peptidoglycan, and membrane fatty acids ester-linked to glycerol (G-3-P lipids)
- Which macromolecule is a primary component of cell walls, and which argument provides evidence for how the structure of this molecule relates to its purpose within the cell wall? A Lipids are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. B Lipids are the primary component, and they protect the cell and help maintain its shape because they form carbon rings. C Carbohydrates are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. D Carbohydrates are the primary component, and they protect the cell and help maintain its shape because they form carbon rings.The following is the site where a lipid is added to a protein to make a lipoprotein: O a. Nucleus O b. Rough Endoplasmic Reticulum O c. Lysosome O d. Mitochondria O e. Golgi apparatusWhich of the following statements is/are incorrect? 1. The cell membrane is purely hydrophobic. 2. Glycerophospholipids have a phosphate derivative group that is known as the polar head group. 3. The individual glycerophospholipid molecules that aggregate become covalently linked to each other to form a lipid bilayer. 4. The interfacial region of a lipid bilayer is polar due to the polar head groups of the lipid molecules that make up the bilayer. O 1 and 3 O 1 only O 2 and 4 O 3 only O 4 only
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