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3.3 Lipids -- Part 2
At one point investigators thought that the total amount of cholesterol in the diet caused diseases.
Trans fats were of little concern to the general public until recently.
The negative effects of trans fats have been brought to light.
Changes in the food services industry have been spurred by public outcry, with more restaurants using trans fat-free oils during cooking and clear labeling of trans fats on all food products.
This is a good example of how scientific evidence can change our perception over time, and it shows the importance of science in the common good.
New evidence gives us more insight into how we function and live.
A double bond causes a tail to twist.
Phospholipids have a polarphosphate group, which is the same as fats, except that in place of the third fatty acid.
The head is in the water, but the tails are not.
There is an unbonded tail.
The major component of a cell's blood vessel is its bilayer, which is made up of phospholipids.
There are kinks in the tails of the phospholipids.
Phospholipids have heads and tails.
When exposed to water, the polar heads are oriented towards the water and the nonpolar fatty acid tails are away from the water.
Living organisms that are mostly made of water tend to have a double layer of phospholipids.
The polar heads like to interact with the water while the non polar tails stay away from it.
Cells are kept separate from the biological compartments within them with the help of a key component.
The cells are surrounded by a plasmamembrane that is made of a phospholipid bilayer.
The structure and function of a cell is dependent on a plasma membrane, and this shows the importance of phospholipids to living organisms.
Four fused carbon rings are skeletons of steroid molecule.
The types of functional groups attached to the carbon skeleton affect each type of steroid.
Many living creatures have these hormones.
The male and female sex hormones are formed primarily in the testes.
Testosterone and estrogen have their own effects on the body and sexuality of an animal.
If estrogen therapy is recommended, some women prefer taking soy products instead of animals.
Cholesterol can be a factor in circulatory disorders.
High blood pressure can be caused by the presence of cholesterol in the lining of blood vessels, which can cause a decrease in the size of the opening.
Carbon chains with alcohol functional groups are connected to long-chain fatty acids.
Waxes have a high melting point, so they are solid at normal temperatures.
They are resistant to degradation and waterproof.
In many plants, waxes, along with other molecules, form a protective cuticle that prevents the loss of water from all exposed parts.
Waxes are involved in skin and fur maintenance in many animals.
Wax is produced by the outer ear canal in humans.
Earwax contains cerumin, an organic compound that repels insects and in some cases even kills them.
Dust and dirt can't reach the eardrum.
The underside of a honeybee's abdomen is where it produces beeswax.
honey is stored in the six-sided cells of the comb.
The sugars in honey are breakdown products of the sugar.
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