3 The presence of cholesterol in the cell membrane of some animals:O increases the fluidity of the membrane at all temperatures.O decreases the fluidity of the membrane at hot temperatures.helps attach the membrane to the cytoskeleton.helps keep integral proteins in the membrane.O makes the organism more susceptible to circulatory disorders.

The presence of cholestrol in the cell membrane of some animals helps to keep the integral proteins…

Answered: increases the fluidity of the membrane…

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter4: Energy And Metabolism

Section: Chapter Questions

Problem 8SQ

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The sugars associated with glycoproteins and glycolipids of animal cell membranes Maintain membrane fluidity at low temperatues Decrease membrane fluidity at high temperatures Serve as an energy source for the cell Serve as markers that distinguish one cell from another
A human pancreatic cell obtains O2—and necessary molecules such as glucose, amino acids, and cholesterol—from its environment, and it releases CO2 as a waste product. In response to hormonal signals, the cell secretes digestive enzymes. It also regulates its ion concentrations by exchange with its environment. Based on the structure and function of cellular membranes, describe how such a cell accomplishes these interactions with its environment.
What is the role of cholesterol in the cell membrane? It converts cis bonds of fatty acids to trans. It allows for the formation of micelle structures. It attracts to the polar phospholipid heads. It reduces membrane fluidity.
Which substance(s) can be moved across membranes from regions where they are less concentrated to regions where they are more concentrated using ATP or another energy source? water oxygen carbon dioxide sodium and glucose animals are unable to move any substances across membranes against their concentration gradients transporter proteins that use ATP can move all of these molecules against their concentration gradients
The presence of cholesterol in the plasma membranes of some animals Group of answer choices A. makes the membrane less flexible, allowing it to sustain greater pressure from within the cell B. enables the animal to add hydrogen atoms to unsaturated phospholipids C. makes the animal more susceptible to circulatory disorders D. enables the membrane to stay fluid more easily when cell temperature drops E. enables the animal to remove hydrogen atoms from saturated phospholipids
Organelles and Cystic Fibrosis A plasma membrane transport protein called CFTR moves chloride ions out of cells lining cavities and ducts of the lungs, liver, pancreas, intestines, and reproductive system. Water that follows the ions creates a thin film that allows mucus to slide easily through these structures. People with cystic fibrosis (CF) have too few copies of the CFTR protein in the plasma membranes of their cells. Not enough chloride ions leave the cells, and so not enough water leaves them either. The result is thick, dry mucus that clogs the airways to the lungs and other passages. Symptoms include difficulty breathing and chronic lung infections. In 2000, researchers tracked the cellular location of the CFTR protein as it was being produced in cells from people with CF (Figure 3.13). Figure 3.13 Cellular location of the CFTR protein. Graph compares the amounts of CFTR protein found in endoplasmic reticulum, vesicles traveling from ER to Golgi, and Golgi bodies in CF cells and normal cells. In which organelle is the amount of CFTR protein most similar in both types of cells?
Organelles and Cystic Fibrosis A plasma membrane transport protein called CFTR moves chloride ions out of cells lining cavities and ducts of the lungs, liver, pancreas, intestines, and reproductive system. Water that follows the ions creates a thin film that allows mucus to slide easily through these structures. People with cystic fibrosis (CF) have too few copies of the CFTR protein in the plasma membranes of their cells. Not enough chloride ions leave the cells, and so not enough water leaves them either. The result is thick, dry mucus that clogs the airways to the lungs and other passages. Symptoms include difficulty breathing and chronic lung infections. In 2000, researchers tracked the cellular location of the CFTR protein as it was being produced in cells from people with CF (Figure 3.13). Figure 3.13 Cellular location of the CFTR protein. Graph compares the amounts of CFTR protein found in endoplasmic reticulum, vesicles travel in g from ER to Golgi, and Golgi bodies in CF cells and normal cells. Which organelle contains the least amount of CFTR protein in normal cells? In CF cells?
Calculate the number of cells in the body of an average 68-kg (150-lb) adult. (This will only be accurate to about 1 part in 10 but should give you an idea how scientists estimate this commonly quoted number.) Assume all cells are spheres 20 m in diameter. The volume of a sphere can be determined by the equation v=4/33. (Hint: We know that about two thirds of the water in the body is intracellular and the density of cells is nearly 1 g/mL. The proportion of the mass made up of water is about 60%.)
Which of the following membranes contain low cholesterol and high cardiolipin?a) Myelin sheathb) Plasma membranec) Inner mitochondrial membrane of hepatocyted) Cell wall
The presence of cholesterol in the plasma membranes of some animals Question 30 options: enables the membrane to stay fluid more easily when cell temperature drops. enables the animal to remove hydrogen atoms from saturated phospholipids. makes the animal more susceptible to circulatory disorders. enables the animal to add hydrogen atoms to unsaturated phospholipids.
Which of the following is true of oxytocin? Multiple Choice The paraventricular nuclei are neurons where oxytocin is synthesized. Phenylalanine and arginine are the amino acids present in oxytocin. Oxytocin is essential for water conservation throughout life. Oxytocin is not a polypeptide.
Cold-blooded organisms may adapt to changing environments by making their membranes more fluid when it is very cold or less fluid when it is very hot heat. Explain in 20 words or fewer how an organism's membranes would change at the molecular level to adapt to a very hot environment

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increases the fluidity of the membrane at all temperatures. decreases the fluidity of the membrane at hot temperatures. helps attach the membrane to the cytoskeleton. helps keep integral proteins in the membrane. makes the organism more susceptible to circulatory disorders.