17. State two functions that the plasma membrane provides (2 points). 18. Figure
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Question
17. State two functions that the plasma membrane provides (2 points). 18. Figure on right for #3. Animal cells contain membrane vesicles called lysosomes, filled with enzymes that can degrade proteins, lpids, nucleic acids, and other biomolecules. These enzymes are most effective at acid pH and it can be experimentally shown that the pH nside lysosomes is about 5.0, hereas the pH ysosome PH S s of the cell cytoplasm is close to 7.0. The diagram (at right) Mustrates one lysosome inside a cell. 1. In the diagram, above structure D (1pt) a. an integral membrane protein b. a phospholipid bilayer c a peripheral protein d. a cholesterol molecule e. a phospholipid molecule 2. In the diagram above, structure F corresponds to: (1 pt) a. an integral membrane protein b. a phospholipid bilayer c. a peripheral membrane protein d. a cholesterol molecule e. a hydrophobic structure 3. Which of the following is the most likely explanation, for how the cell maintains such a high concentration of protons (H+ ions) inside the lysosome? (2 pts) a. There is a facilitated diffusion proton channel in the lysosomal membrane. b. There is a facilitated diffusion proton uniporter in the e. a phospholipid molecule ysosomal membrane. c. There is an ATP-powered proton pump in the lysosomal membrane. d. Protons can diffuse across the lysosomal membrane without needing a protein carrier e. There is an antiporter in the lysosomal membrane that can exchange protons for lysosomal enzymes.Explanation / Answer
17. Protection
selective permeability
Respond to changes in environment or signals
18. 1. an integral membrane protein
2. a cholesterol molecule
3. C. There is an ATP powered proton pump in lysosomal membrane.
4. 1.Peripheral protein act as a receptor
2.it combines with carbohydrates and act as a antigen in some cells.
1.Integral protein used for transport molecule in and out of the cell.
2.It act has channel or carrier protein.
5. Carbon, Hydrogen, Oxygen, Nitrogen
6. Because water can form hydrogen bond with other polar molecules easily. It capable of dissolving a variety of different substances. It acts asa universal solvent.
7. Carbohydrates, Lipids, Proteins, and Nucleic Acids
carbohydrates - This are aldose or ketose molecules with 3 - 6 carbon molecules. This called as monosaccharides. Thre monosaccharides are join together to form polymers or polysaccharides.Starch, glycogen
Proteins - Building block of proteins. This makes a peptide bond between amino acids to form polypeptide. Eg, collagen
Nucleic acids - The ring structure Pyrimidine - a nitrogenous base that has a single-ring structure; one of the two general categories of nitrogenous bases found in DNA and RNA; thymine, cytosine, or uracil.
Purine - nitrogeneous bases that have a double ring of carbon and nitrogen atoms such as adenine and guanine, a nitrogenous base that has a double-ring structure.
This join by phosphodiester bond and make up DNA or RNA.
Lipids - It is hydrophobic and made up of energy rich organic compounds like fats, oils and waxes.
This form saturated and unsturated fatty acids. Eg, Linoeic acid, oelic acid
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