IB Biology Practice Questions Test! Quiz

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Questions: 10 | Attempts: 14,779 | Updated: Mar 22, 2023

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IB Biology Practice Questions Test! Quiz - Quiz

The study of biology is what gives us our knowledge of life in the world around us from a scientific standpoint. It allows us to know more about ourselves and what we are comprised of, what the functions of our components are, and it goes even deeper by looking at animals, plants, and even organisms too small to see. What do you know about biology? Let’s find out.

Questions and Answers

1.

What is one role of the element phosphorus?
- A.
  
  It forms part of the structure of amino acids.
- B.
  
  It forms part of the structure of fatty acids.
- C.
  
  It forms part of the structure of ribose.
- D.
  
  It forms part of the structure of nucleotides.
Correct Answer
D. It forms part of the structure of nucleotides.

Explanation
Phosphorus is an essential element in the structure of nucleotides. Nucleotides are the building blocks of nucleic acids such as DNA and RNA. Phosphorus forms the backbone of these nucleotides, linking them together to form the long chains that make up the structure of DNA and RNA molecules. This role of phosphorus is crucial for the proper functioning of genetic material and the transmission of genetic information.

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2.

Which molecule is a monosaccharide?
- A.
  
  Ribose
- B.
  
  Glycogen
- C.
  
  Amylase
- D.
  
  Glycerol
Correct Answer
A. Ribose

Explanation
Ribose is a monosaccharide because it is a simple sugar consisting of a single sugar unit. Monosaccharides are the building blocks of carbohydrates and are the simplest form of sugar. Glycogen and amylase are polysaccharides, which are made up of multiple sugar units, while glycerol is a type of alcohol and not a sugar molecule. Therefore, Ribose is the correct answer as it fits the definition of a monosaccharide.

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3.

What is a role of carbohydrates in animal cells?
- A.
  
  As channels for passive transport
- B.
  
  As enzymes
- C.
  
  As energy storage
- D.
  
  As components of the animal cell wall
Correct Answer
C. As energy storage

Explanation
Carbohydrates play a crucial role in animal cells as a source of energy storage. They are broken down during cellular respiration to release ATP, which is used as a fuel for various cellular processes. Carbohydrates are stored in the form of glycogen in animals, which can be quickly converted back into glucose when energy is needed. This allows animals to maintain a steady supply of energy for their metabolic activities. Therefore, the role of carbohydrates in animal cells is primarily to serve as an energy reserve.

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4.

Which of the following features are correct for hydrogen bonding?I. It is involved in the cohesion of water.II. It results in the thermal properties of water.III. It is a bond within the water molecule.
- A.
  
  I and II only
- B.
  
  II and III only
- C.
  
  I and III only
- D.
  
  I, II and III
Correct Answer
A. I and II only

Explanation
Hydrogen bonding is involved in the cohesion of water, which refers to the attraction between water molecules that allows them to stick together. This bonding also results in the thermal properties of water, such as its high specific heat and heat of vaporization. However, hydrogen bonding is not a bond within the water molecule itself, as water molecules are held together by covalent bonds. Therefore, the correct features for hydrogen bonding are I and II only.

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5.

In which part of the digestive system is most water re-absorbed?
- A.
  
  The kidneys
- B.
  
  The stomach
- C.
  
  The small intestine
- D.
  
  The large intestine
Correct Answer
D. The large intestine

Explanation
The large intestine is responsible for re-absorbing the majority of water in the digestive system. As food passes through the small intestine, most of the nutrients and water are absorbed into the bloodstream. By the time the remaining waste material reaches the large intestine, the majority of water has already been absorbed, leaving behind a more solid waste product. The large intestine's main function is to further absorb water and electrolytes, helping to form solid feces before elimination.

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6.

Which of the following reactions occurs when a dipeptide is formed from amino acids?
- A.
  
  Hydrolysis
- B.
  
  Denaturation
- C.
  
  Condensation
- D.
  
  Oxidation
Correct Answer
C. Condensation

Explanation
When a dipeptide is formed from amino acids, the reaction that occurs is condensation. Condensation is a chemical reaction in which two molecules combine to form a larger molecule, with the release of a small molecule such as water. In the case of dipeptide formation, two amino acids join together through a condensation reaction, where the carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the formation of a peptide bond between them.

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7.

Which is not a primary function of protein molecules?
- A.
  
  Hormones
- B.
  
  Energy storage
- C.
  
  Transport
- D.
  
  Structure
Correct Answer
B. Energy storage

Explanation
Protein molecules have various functions in the body, including acting as enzymes, hormones, transporters, and providing structural support. However, energy storage is not a primary function of protein molecules. Carbohydrates and lipids are the main macronutrients responsible for energy storage in the body, while proteins primarily play a role in building and repairing tissues, regulating bodily processes, and transporting molecules.

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8.

Which of the following could be a function of a membrane protein?
- A.
  
  Energy storage
- B.
  
  Enzymatic activity
- C.
  
  Oxygen uptake
- D.
  
  Thermal insulation
Correct Answer
B. Enzymatic activity

Explanation
Membrane proteins are proteins that are embedded in the cell membrane and perform various functions. One of the functions of a membrane protein could be enzymatic activity. Enzymes are proteins that catalyze biochemical reactions in the cell, and many enzymes are found in the cell membrane. These membrane proteins can act as enzymes to facilitate specific chemical reactions, such as breaking down or building up molecules. Therefore, enzymatic activity is a plausible function for a membrane protein.

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9.

What can reduce the effect of a competitive inhibitor of an enzyme?
- A.
  
  Decrease the temperature at which the reaction takes place.
- B.
  
  Increase the temperature at which the reaction takes place.
- C.
  
  Increase the substrate concentration.
- D.
  
  Add a non-competitive inhibitor.
Correct Answer
C. Increase the substrate concentration.

Explanation
Increasing the substrate concentration can reduce the effect of a competitive inhibitor of an enzyme because a competitive inhibitor competes with the substrate for the active site of the enzyme. By increasing the substrate concentration, there will be a higher chance for the substrate to bind to the enzyme's active site instead of the inhibitor. This effectively reduces the inhibitory effect of the competitive inhibitor, allowing the enzyme to function more efficiently.

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10.

Which of the following could cause denaturation of an enzyme?
- A.
  
  Substrate concentration
- B.
  
  A competitive inhibitor
- C.
  
  High temperature
- D.
  
  Low salt concentration
Correct Answer
C. High temperature

Explanation
High temperature can cause denaturation of an enzyme because it disrupts the weak bonds, such as hydrogen bonds and van der Waals forces, that maintain the enzyme's three-dimensional structure. This disruption leads to a loss of the enzyme's active site shape and functionality, rendering it unable to catalyze reactions effectively.

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IB Biology Practice Questions Test! Quiz

What is one role of the element phosphorus?

Which molecule is a monosaccharide?

What is a role of carbohydrates in animal cells?

Which of the following features are correct for hydrogen bonding?I. It is involved in the cohesion of water.II. It results in the thermal properties of water.III. It is a bond within the water molecule.

In which part of the digestive system is most water re-absorbed?

Which of the following reactions occurs when a dipeptide is formed from amino acids?

Which is not a primary function of protein molecules?

Which of the following could be a function of a membrane protein?

What can reduce the effect of a competitive inhibitor of an enzyme?

Which of the following could cause denaturation of an enzyme?