Cells can store energy as starches (long polymer forms of carbohydrates, or sugars) and fats. If you isolate the starch stored by a cell, you would find that a lot of the mass of the isolated starch is actually water. However, if you isolate the fat stored by a cell you would find that very little of the mass of the fat is water. Explain this difference based on the structures or properties of the starch and fat molecules

Cells can store energy as starches (long polymer forms of carbohydrates, or sugars) and fats. If you isolate the starch stored by a cell, you would find that a lot of the mass of the isolated starch is actually water. However, if you isolate the fat stored by a cell you would find that very little of the mass of the fat is water. Explain this difference based on the structures or properties of the starch and fat molecules

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter2: Chemistry Of Life

Section: Chapter Questions

Problem 10RQ: Phospholipids are important components of_______. a. the plasma membrane of cells b. the ring...

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Draw a sketch of a lipid bilayer, the structure that forms when a lipid such as phosphatidyl serine is dissolved in water.
A phospholipid is a biomolecule composed of a phosphate group that is bonded to two lipid chains. Which of the following correctly describes the nature of those two components? (a) The phosphate group is hydrophobic, and the lipid chains are hydrophilic. (b) Both the phosphate group and the lipid chains are hydrophilic. (c) Both the phosphate group and the lipid chains are hydrophobic. (d) The phosphate group is hydrophilic, and the lipid chains are hydrophobic.
Proteins are among the most diverse macromolecules because A-they contains both amino groups and carboxyl groups. B-they can twist and fold into many different and complex structures. C-they contains nitrogen as well as carbon, hydrogen, and oxygen. D-their R groups can be either acidic or basic Which of the following statements about cellulose is true? A-Animals make it and use it to store energy. B-Plants make it and use it to store energy. C-Animals make it and use it as part of the skeleton. D-Plants make it and use it to give structural support to cells. A major difference between polysaccharides and proteins is that a-plants make polysaccharides, while animals make proteins. B-proteins are made of monomers, while polysaccharides are not. C-polysaccharides are made of monosaccharides, while proteins are made of amino acids. D-proteins carry genetic information, while polysaccharides do not.
The structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if A. Phospholipids had only one hydrocarbon tail instead of two?B. The hydrocarbon tails were shorter than normal, say, about 10 carbon atoms long?C. All of the hydrocarbon tails were saturated?D. All of the hydrocarbon tails were unsaturated?E. The bilayer contained a mixture of two kinds of phospholipid molecules, one with two saturated hydrocarbon tails and the other with two unsaturated hydrocarbon tails?F. Each phospholipid molecule were covalently linked through the end carbon atom of one of its hydrocarbon tails to a phospholipid tail in the opposite monolayer?
The most abundant element, by mass, in living organisms is: a) C b) O c) N d) Na Which of these molecules is a polymeric macromolecule? A) glucose b) urea c) citric acid d) albumin (a protein) A polymeric macromolecule which consists of glucose monomer units is: a) glycogen b) albumin c) phosphatidyl choline d) cholesterol
Why is cellulose considered “fiber” in your diet but starch is not? In your answer, refer specifically to the structures of cellulose, amylose, and amylopectin.
Phospholipids are important components of_______. a. the plasma membrane of cells b. the ring structure of steroids c. the waxy covering on leaves d. the double bond in hydrocarbon chains
Which of the following is incorrect regarding phospholipids?a. The heads are polar.b. The tails are nonpolar.c. They contain a phosphate group in place of one fatty acid.d. They are energy-storage molecules in the cell.
A phospholipid has a head and two tails. The tails are found----- *
what will happen if the phospholipids only have 2 carbon in their structure instead of the usual or standard 3 carbon? give an example.
Which of the following is true of the molecule pictured below? A) It will spontaneously form into biological membranes. B) It would be liquid at room temperature because it contains unsaturated fatty acids. C) It would be solid at room temperature because it contains only saturated fatty acids. D) It would be liquid at room temperature because it contains only saturated fatty acids. E) It would be solid at room temperature because it contains unsaturated fatty acids.
Which of the following is the compound that animals use to store sugars? Select one: a. Cellulose b. Glucose c. Starch d. Amylopectin e. Glycogen f. Chitin