Biology ยท Chemistry

Carbohydrates and Biomolecules

986 Questions

Carbohydrates and biomolecules questions test your understanding of sugars, monosaccharides, and metabolic substrates. The topic covers food transportation in plants and the biochemical properties of sweeteners. Practicing these questions builds a strong foundation for exam preparation.

Disaccharides and monosaccharidesArtificial sweetenersGlycogen storagePlant food transportGlycoprotein hormones

Carbohydrates and Biomolecules Questions

Multiple choice

Which of the following is the first step in the digestion of carbohydrates?

  1. Salivary amylase breaks down starch into maltose.

  2. Pancreatic amylase breaks down starch into glucose.

  3. Lactase breaks down lactose into glucose and galactose.

  4. Sucrase breaks down sucrose into glucose and fructose.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salivary amylase is an enzyme produced in the salivary glands that begins the digestion of carbohydrates in the mouth.

Multiple choice

Which of the following is NOT a type of carbohydrate that can be digested by humans?

  1. Starch

  2. Glucose

  3. Fructose

  4. Cellulose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cellulose is a type of carbohydrate that cannot be digested by humans because we lack the necessary enzymes to break it down.

Multiple choice

What is the chemical formula for glucose?

  1. C6H12O6

  2. C6H14O6

  3. C6H10O6

  4. C6H8O6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glucose is a compound composed of carbon, hydrogen, and oxygen atoms. The chemical formula for glucose is C6H12O6, which indicates that there are six carbon atoms, twelve hydrogen atoms, and six oxygen atoms in each molecule.

Multiple choice

Which type of carbohydrate is digested and absorbed more slowly, leading to a steadier rise in blood sugar levels?

  1. Simple Carbohydrates

  2. Complex Carbohydrates

  3. Refined Carbohydrates

  4. Processed Carbohydrates
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Complex carbohydrates are digested and absorbed more slowly than simple carbohydrates, leading to a steadier rise in blood sugar levels. They are found in whole grains, fruits, vegetables, and legumes.

Multiple choice

Which of the following is NOT a common artificial sweetener used in carbonated soft drinks?

  1. Aspartame

  2. Sucralose

  3. Stevia

  4. High-fructose corn syrup
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stevia is a natural sweetener derived from the leaves of the stevia plant, while aspartame, sucralose, and high-fructose corn syrup are artificial sweeteners commonly used in carbonated soft drinks.

Multiple choice

What is the primary carbohydrate found in yogurt?

  1. Lactose

  2. Glucose

  3. Fructose

  4. Sucrose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lactose is the primary carbohydrate found in yogurt. It is a natural sugar present in milk and is responsible for the sweet taste of yogurt. Some yogurt products may contain added sugars, such as honey or fruit, which can increase the overall carbohydrate content.

Multiple choice

Which food processing technique involves breaking down complex carbohydrates into simpler sugars?

  1. Fermentation

  2. Pasteurization

  3. Homogenization

  4. Ultra-High Temperature (UHT) Processing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fermentation involves the breakdown of complex carbohydrates into simpler sugars by microorganisms, often used in the production of alcoholic beverages, yogurt, and sauerkraut.

Multiple choice

Which biomolecule is responsible for transmitting nerve impulses in the nervous system?

  1. Carbohydrates

  2. Proteins

  3. Lipids

  4. Nucleic acids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Proteins, specifically neurotransmitters, are responsible for transmitting nerve impulses across synapses in the nervous system.

Multiple choice

What is the main carbohydrate found in pulses?

  1. Starch

  2. Cellulose

  3. Hemicellulose

  4. Pectin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The main carbohydrate found in pulses is starch.

Multiple choice

What is the main difference between low-glycemic and high-glycemic foods?

  1. Low-glycemic foods release glucose slowly into the bloodstream, while high-glycemic foods release glucose quickly.

  2. Low-glycemic foods are higher in calories than high-glycemic foods.

  3. Low-glycemic foods are less nutritious than high-glycemic foods.

  4. Low-glycemic foods are more expensive than high-glycemic foods.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The main difference between low-glycemic and high-glycemic foods is that low-glycemic foods release glucose slowly into the bloodstream, while high-glycemic foods release glucose quickly. This can have a significant impact on blood sugar levels.

Multiple choice

What is the glycemic index of white bread?

  1. 55-60

  2. 70-75

  3. 85-90

  4. 100
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White bread has a glycemic index of 70-75, which is considered to be high. This means that it can cause a rapid increase in blood sugar levels.

Multiple choice

What is the primary carbohydrate found in yogurt?

  1. Lactose

  2. Glucose

  3. Fructose

  4. Sucrose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lactose is the primary carbohydrate found in yogurt, which is the natural sugar present in milk.

Multiple choice

Which type of fruit is being used to develop new natural sweeteners as a healthier alternative to sugar?

  1. Monk fruit

  2. Stevia

  3. Erythritol

  4. Xylitol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monk fruit is a tropical fruit that is native to Southeast Asia. It is known for its naturally sweet taste, which is due to a compound called mogrosides. Monk fruit extract is being used to develop new natural sweeteners that are much sweeter than sugar but have a low glycemic index.

Multiple choice

Which of the following is responsible for the sweet taste of fruits and vegetables?

  1. Glucose

  2. Fructose

  3. Sucrose

  4. Lactose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fructose is a natural sugar found in fruits and vegetables, and it is the sweetest of all the common sugars.

Multiple choice

What is the scientific term for the process by which enzymes break down complex carbohydrates into simpler sugars?

  1. Hydrolysis

  2. Oxidation

  3. Reduction

  4. Polymerization
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrolysis is a chemical reaction that involves the splitting of a compound into two or more smaller compounds by the addition of water.