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1. Say whether these statements are true or false.

1. Biochemistry is a study of chemical processes that take place outside a human body. 2. Biochemistry as a science was founded more than 1000 years ago. 3. Carl Neuberg was the first to propose the term “biochemistry” in 1903. 4. The basic bio-compounds are small molecules, monomers and polymers. 5. Lipids are structural components of cell membranes. 6. Lipids are divided into eighteen categories. 7. Carbohydrates are responsible for the storage and transport of energy and also act as structural components. 8. The building blocks of proteins are nucleotides.

2. Give synonyms to the following words:

simple, various, vital, activity, day-to-day life, to study, basic, a concept, a field, approximately, to propose, a compound, a characteristic, to include, essential, a component, quantity, to acquire, growth, to carry, broadly.

13. Lipids

a compound

суміш; сполучення

a cell

клітина

soluble

розчинний

backbone

основа

to share

поділяти; мати спільно

to bond

зв’язувати

wax

віск

to be termed

називатися

essentially

суттєво

abundant

численний

Lipids are a class of naturally-occurring organic compounds that you may know by their common names: fats and oils. Here’s a look at the function, structure, and physical properties of lipids.

What Is a Lipid?

A lipid is a fat-soluble molecule. To put it another way, lipids are insoluble in water but soluble in at least one organic solvent. The other major classes of organic compounds (nucleic acids, proteins, and carbohydrates) are much more soluble in water than in an organic solvent. Lipids do not share a common molecule structure.

Examples of Common Lipids.

There are many different types of lipids. Examples of common lipids include butter, vegetable oil, cholesterol and other steroids, waxes, phospholipids, and fat-soluble vitamins. The common characteristic of all of these compounds is that they are essentially insoluble in water yet soluble in one or more organic solvents.

What Are the Functions of Lipids?

Lipids are used by organisms for energy storage, as a signalling molecule (e.g., steroid hormones), and as a structural component of cell membranes.

Lipid Structure.

Although there is no single common structure for lipids, the most commonly occurring class of lipids are triglycerides, which are fats and oils. Triglycerides have a glycerol backbone bonded to three fatty acids. If the three fatty acids are identical then the triglyceride is termed a simple triglyceride. Otherwise, the triglyceride is called a mixed triglyceride.

The second most abundant class of lipids consists of the phospholipids, which are found in animal and plant cell membranes. Phospholipids also contain glycerol and fatty acids, plus they contain phosphoric acid and a low-molecular-weight alcohol. Common phospholipids include lecithins and cephalins.

Speech patterns

to put it

another way (otherwise)

інакше кажучи

baldly (frankly, plainly)

відверто кажучи

mildly

м’яко кажучи

in a nutshell

коротше кажучи

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