Chapter 10 Lipids Multiple Choice Questions 1. Structural lipids in membranes Pages: 343-345 Difficulty: 2 Ans: A Which of the following statements concerning fatty acids is correct? A) One is the precursor of prostaglandins. B) Phosphatidic acid is a common one. C) They all contain one or more double bonds.
Fatty acids are chains of carbon atoms; the terminal one having an OOH group attached making a carboxylic group (COOH). The length of the chain is usually between 14 and 22 carbons long. Three of these chains become attached to a glycerol molecule which has 3 OH groups attached to its 3 carbons. This is called a condensation reaction because 3 water molecules are formed from 3 OH groups from the fatty acids chains and 3 H atoms from the glycerol. The bond between the fatty acid chain and the glycerol is called an ester linkage.
Each cis double bond causes a kink in the chain, or a bent tail. Most naturally occurring fatty acids have an even number of carbon atoms—12-24. What are the unique structural features of fatty acids? Amphipathic, having a non-polar end and a polar end. Fatty acids consist of a long hydrocarbon "tail“, which is hydrophobic due to nonpolar C-H bonds, attached to a hydrophilic "head" consisting of a carboxyl group.
1) What is the primary structure of a protein? The primary structure is a linear sequence of how amino acids are arranged in a polypeptide chain. These interactions form a covalent backbone. 2) Why isn’t there free rotation around the peptide bond? Because the amino nitrogen associated within the peptide bond has a lone pair, this allows for a resonance structure to take place.
Only the enzyme will fix the substrate because of the active sites on the enzyme. Once locked together, the enzyme can break down the substrate (Hudon-Miller, 2012c). An example of this is Sucrose. Sucrose is considered a regular table sugar. It is composed of two monosaccharaides: glucose and fructose.
BIOL-110 Elements of Biology Assignment 1 Student Name: Part A: Multiple Choice Questions and Fill in the Blanks 1) A covalent chemical bond is one in which * c) Outer-shell electrons of two atoms are shared 2) Which of the following is not a weak molecular interaction? * a) A covalent bond 3) Polysaccharides, lipids, and proteins are similar in that they * b) Are synthesized from monomers by dehydration reactions. 4) Which of the following is a compartment that often takes up much of the volume of a plant cell? * b) Vacuole 5) The presence of cholesterol in the plasma membranes of some animals * a) Enables the membrane to stay fluid more easily when cell temperature drops 6) Which of the following types of molecules are the major structural
12: Hydrolysis reactions ARE EXOTHERMIC 13: If a molecule is described as "organic," this means it CONTAINS CARBON AND HYDROGEN 14: Glucose is a sugar with six carbons. This makes it a HEXOSE Hexoses (sugars with six carbons), such as glucose, play a vital role in the metabolism of all cells. 15: A proton is an atomic particle with a POSTIVE CHARGE 16: Pasteur made major contributions to the study of which of the following? FERMENTATION 17: Which of the following is NOT associated with the structure of fats? PEPTIDE BONDS 18: Members of which of the following groups are
Emilio Lajara Pre-Lab Write Up Chapter Three 02-05-08 Objective- Proteins are made up of amino acids. All amino acids are found in cells. They have an acidic group and an amino group. A peptide is when one or more amino acids form a chain, while a polypeptide is a long chain of amino acids. A protein can contain one or more polypeptide chains.
SER lacks ribosomes and participates in lipid synthesis and detoxification. The Golgi apparatus is a system of membranous cisternae and vesicles arranged in stacks near the nucleus. The Golgi processes and modifies sugar side chains on proteins that are being secreted or destined for the plasma membrane or other membrane-bound organelles like the lysosome. Therefore, the Golgi apparatus is particularly prominent in cells synthesizing large
Rough ER transports these proteins to the regions in the cell where it is needed. | Ribosomes | A ribosome is composed of two parts known as the large and small subunits. Each of these is a combination of protein and a type of RNA known as rRNA. | the main thing they do is that they arrange the strands of the amino acids for use of the other parts of the cell and ultimately the body. | Goigi Apparatus | The main function of the Golgi apparatus is to be responsible for handling the macromolecules that are required for proper cell functioning | It packages and ships molecules made in the ER.