Biological Molecules - You Are What You Eat: Crash Course Biology #3

What are the main types of biological molecules that make up all living things?

• Carbohydrates, Lipids, Proteins, Nucleic Acids

• Sugars, Fats, Salts, Water

• Vitamins, Minerals, Fibers, Enzymes

• Oxygen, Hydrogen, Carbon, Nitrogen

What did William Prout discover about the human stomach?

• It contains digestive enzymes.

• It contains hydrochloric acid.

• It is where food is absorbed.

• It is responsible for making blood.

What is the simplest type of sugar molecule that is a basic source of energy for living things?

• Sucrose

• Fructose

• Glucose

• Cellulose

How do human bodies store extra carbohydrate energy for short periods?

• As starch

• As cellulose

• As glycogen

• As fructose

Why do lipids, like oil, not mix with water?

• Their chemical bonds are mostly polar.

• Their chemical bonds are mostly non-polar.

• They are heavier than water.

• They are lighter than water.

What is the main difference between saturated and unsaturated fatty acids?

• Saturated fats have some double bonds between carbon atoms.

• Unsaturated fats are usually solid at room temperature.

• Saturated fats have carbon atoms connected by single bonds, allowing them to hold more hydrogen.

• Unsaturated fats are only found in animal products.

What important part of a cell is made up of phospholipids?

• The nucleus

• The cell membrane

• The mitochondria

• The cytoplasm

Why do humans need to eat foods that contain essential amino acids?

• Essential amino acids help us digest food faster.

• Our bodies can make all the essential amino acids we need.

• Our bodies cannot make these amino acids, so we must get them from food.

• Essential amino acids are only found in plant-based foods.