2. Which of the following statements about biological membranes are true? (Select all that apply.) a. Hydrophobic tails of phospholipids face toward each other; hydrophilic heads face out. b. Phospholipids can move laterally in their half of the bilayer. c. The carbohydrate group attached to membrane glycoproteins faces the cytosol. d. They are selectively permeable.

2. Which of the following statements about biological membranes are true? (Select all that apply.) a. Hydrophobic tails of phospholipids face toward each other; hydrophilic heads face out. b. Phospholipids can move laterally in their half of the bilayer. c. The carbohydrate group attached to membrane glycoproteins faces the cytosol. d. They are selectively permeable.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter4: Cells

Section: Chapter Questions

Problem 7TYK: Which of the following statements about proteins is correct? a. Proteins are transported to the...

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Which of the following statements about proteins is correct? a. Proteins are transported to the rough ER for use within the cell. b. Lipids and carbohydrates are added to proteins by the Golgi complex. c. Proteins are transported directly into the cytosol for secretion from the cell. d. Proteins that are to be stored by the cell are moved to the rough ER. e. Proteins are synthesized in vesicles.
1. Which of the following macromolecules can be found in, or associated with, cell membranes? (Select all that apply) Carbohydrates Proteins Nucleic acids Lipids 2. The molecule cholesterol can be found in membranes of..? a. Animal cells b. Bacterial cells c. Plant cells d. Cholesterol is not found in cell membranes 3. Peripheral membrane.. ( proteins pick one) a Cross through the entire distance of the membrane b Are fully embedded in the membrane c Associate with the polar head groups of the phospholipids d Associate with the nonpolar tails of the phospholipids e Are covalently attached to a lipid anchor 4 Transmembrane proteins.. (one answer) are membrane proteins attached to carbohydrates Associate with the polar head groups of the phospholipids Are covalently attached to the phospholipids Cross through the entire distance of the membrane Are proteins required to maintain membrane strength 5. Which of the following is…
Describe the 4 essential macromolecules that are important to all living things. Which two macromolecules primarily make up the membrane of the cell? How do these molecules contribute to the overall function of the cell membrane?
4. The cells making up the epithelial linings of organs that contain liquid, e.g., the bladder and intestines, could be expected to be held together via many ______ in order to provide a waterproof lining. A. tight junctions B. gap junctions C. phospholipids D. intermediate filaments
1.Which of the following is TRUE about the movement of water across membranes? a.Water migrates to an area of low salt concentration. b.Water migrates to an area with high lipid content c.Water migrates to an area with high salt concentration. d.Water migrates into and out of the cell at equal rates. 2. Which of the following molecules/ material can freely pass through the cell membrane's phospholipids? a.carbon dioxide b.lipids c.oxygen molecule
2. Use the following vocabulary to label and draw a cell membrane: cytoplasm (cell lumen) extra-cellular fluid hydrophobic hydrophilic polar head non-polar tails a) How many O-H groups are there? And are the O-H areas of sucrose polar or non-polar? b) What is the term that is used to discuss how tightly or loosely an atom's nucleus has a hold of its valence electrons? c) Do you think any water molecules move in the opposite direction of the arrow? Explane your answer in detail.
17. The transition temperature of a membrane bilayer is determined directly or indirectly a. the ability of lipid molecules to be packed together b. whether the fatty acid chains of the lipids are saturated or unsaturated c. the extent to which the fatty acid chains of the lipids contain double bonds d. the length of the fatty acid chains. e. All of the above are correct answers.
1. Draw the structure of phosphatidic acid. Circle the polar parts of the molecule and box the non-polar parts of the molecule. 2.Based on the structure why would this molecule be a major building block for glycerophospholipids that make up the cell membrane? In your answer include which part of the molecule would be inside the membrane and which one out and why. 3. What specific “effect”would drive your answer to 2?
2. Unlike soluble, cytosolic proteins, transmembrane proteins are more difficult to purify, Which of the following substances is most used to help purify a transmembrane protein? a. high salt solution b. sucrose c. detergent d. ethanol e. glucose
1. Will the water penetrate all through the sandwich? Explain. 2. Explain which layer(s) of the sandwich are hydrophobic and which layer/s arehydrophilic. How is this similar to the structure of a cell membrane?
1. Generally, prokaryotes, such as bacteria, does not have membrane-bounded organelles. Vacuoles are membrane-bounded organelles. The question is, why do bacteria are said to have vacuoles? Support your answer with scientific/factual information.2. Are lysosomes present in plant cells? Explain your answer with scientific/factual information.3. In your own words, explicitly describe/discuss the endomembrane system.
1. Which of the following lipids have one or more fatty acids in their structure? Select all that apply Steroids Waxes Triglycerides Phospholipids None of the above contain fatty acids 2 What causes transmembrane proteins to remain within the membrane? One answer a. They are covalently attached to the extracellular matrix b. They are covalently attached to the membrane lipids c. They are hydrogen bonded to the fatty acid tails of the membrane lipids d. The have both hydrophobic and polar regions e. They contain only polar or charged amino acids 3. Unsaturated fats are liquids at room temperature because? One answer They have only two fatty acid chains attached to glycerol Their fatty acids are bent, limiting interactions between the molecules They are amphipathic, resulting in the formation of a bilayer Unsaturated fats are usually solid at room temperature Their fatty acids have only single bonds between carbons, allowing tight…