Lipids and Steroids Quiz

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What is the primary function of lipids?

To speed up biochemical reactions

To kill other bacteria

To form plasma membranes that enclose cells (correct)

To transport certain chemicals into and out of cells

Which group of compounds is structurally very different from lipids?

Proteins

Triglycerides

Steroids (correct)

Fatty acids

In a living cell, which organic compound group would tip the scale if separated and weighed?

Triglycerides

Fatty acids

Lipids

Proteins (correct)

Which proteins speed up biochemical reactions?

Enzymes Signup and view all the answers

What is the essential function of transporter proteins?

To transport certain chemicals into and out of cells Signup and view all the answers

Which organic compound group is important constituents of the plasma membranes of animal cells and mycoplasmas?

Steroids Signup and view all the answers

What is the main energy-supplying molecule of living cells?

Glucose Signup and view all the answers

Which type of carbohydrates consist of tens or hundreds of monosaccharides joined through dehydration synthesis?

Polysaccharides Signup and view all the answers

What is composed of glucose subunits and synthesized as a storage material by animals and some bacteria?

Glycogen Signup and view all the answers

Which compound is the main component of the cell walls of plants and most algae?

Cellulose Signup and view all the answers

Which group of organic compounds found in living matter provides the structure of membranes and some cell walls?

Lipids Signup and view all the answers

If lipids were to suddenly disappear from the Earth, what would be the consequence for living cells?

Immediate cell collapse Signup and view all the answers

What are characteristic functional groups in organic compounds?

Groups of atoms responsible for most chemical reactions Signup and view all the answers

Which organic compound includes sugars and starches?

Carbohydrates Signup and view all the answers

What is the main function of deoxyribose in living organisms?

Being a building block of DNA Signup and view all the answers

What is the principal function of carbohydrates in living systems?

Functioning as food reserves Signup and view all the answers

Which type of sugars are called monosaccharides?

Sugars with three to seven carbon atoms Signup and view all the answers

What is the role of hexoses and pentoses in living organisms?

Fueling cellular activities Signup and view all the answers

What ions do acids dissociate into in an aqueous environment?

H+ and anions Signup and view all the answers

How does the pH scale express the amount of H+ in a solution?

Linear scale from 0 to 14 Signup and view all the answers

What happens to enzymes in cells when acid or base concentrations are too high or too low?

They denature and lose their function Signup and view all the answers

Which ions are free in a solution that is considered acidic?

H+ Signup and view all the answers

Why is it important for organisms to maintain a balance of acids and bases?

To ensure proper enzyme function Signup and view all the answers

In terms of the pH scale, what does a change of one whole number represent?

A tenfold change in concentration Signup and view all the answers

What is the role of water in facilitating the passage of nutrients through cell membranes?

Water dissolves nutrients for easier passage Signup and view all the answers

How does water contribute to most chemical reactions inside living cells?

Water serves as a medium for reactions to occur Signup and view all the answers

What defines an acid based on its ability to donate?

Acids donate protons (H+) Signup and view all the answers

Which ions do bases dissociate into when in water?

Negatively charged hydroxide ions (OH-) Signup and view all the answers

What differentiates a salt from acids and bases?

Salts dissociate into cations and anions that are not H+ or OH- Signup and view all the answers

In the context of acid-base balance, the pH scale measures the concentration of which ions?

Hydrogen ions (H+) Signup and view all the answers

What is the primary function of pH buffers in living organisms?

To maintain a steady pH in the presence of waste products Signup and view all the answers

Which of the following is NOT a factor that can alter the pH in the environment's water and soil?

Nutrient absorption by plants Signup and view all the answers

What is the significance of adding pH buffers to a culture medium in a laboratory?

To prevent drastic pH changes that can inhibit bacterial growth Signup and view all the answers

Which of the following building blocks are carbohydrates primarily composed of?

Monosaccharides Signup and view all the answers

In the context of organic compounds, what differentiates simple lipids from complex lipids and steroids?

Simple lipids only contain carbon and hydrogen, while complex lipids and steroids contain additional elements Signup and view all the answers

What is the role of the pH scale in understanding acid-base balance?

To quantify the acidity or basicity of a solution on a numerical scale Signup and view all the answers