IB BIO Y1 2.1-2 + 8.3 Test 2022

Which molecule diagram corresponds to the name?

• 
• 
• 
• 

The diagram shows a cycle of reactions that occurs in human liver cells.

Which term describes the overall reactions of this cycle?

• Oxidation

• Catabolism

• Condensation

• Metabolism

The diagram shows the structure of palmitic acid.

What type of fatty acid is palmitic acid?

• It is monounsaturated.

• It is polyunsaturated.

• It is saturated.

• It is a trans-fatty acid.

Glucose is absorbed through protein channels in the plasma membrane of epithelium cells in the small intestine. Which characteristics of glucose prevent its diffusion through the phospholipid bilayer?

 

• It is non-polar and therefore hydrophobic.

• Its hydrogen bonds link with amino acids in the protein channel.

• It is polar and therefore hydrophilic.

• Its covalent bonds interact with the phospholipids.

• Reaction : Condensation

  Products :

  2 Nucleotides

• Reaction: Condensation

  Products :

  1 Dinucleotide

• Reaction : Hydrolysis

  Products:

  2 Nucleotides

• Reaction: Hydrolysis

  Products:

  1Dinucleotide

Which process is an example of catabolism?

• Translation of mRNA

• Replication of DNA

• Hydrolysis of protein

• Synthesis of a disaccharide

Cell metabolism involves anabolic and catabolic reactions. Which process directly involves anabolism?

• Active transport of ions

• Release of energy from glucose

• Production of intracellular enzymes

• Breakdown of worn-out cell organelles by lysosomes

Which type of chemical reaction is an example of anabolism?

• Photolysis

• Combustion

• Hydrolysis

• Condensation

Lipids are more efficient energy stores than carbohydrates. What is a reason for this?

• Lipids are bigger molecules than carbohydrates.

• Lipids release more energy per gram than carbohydrates.

• Lipids can be more easily mobilized than carbohydrates when needed.

• Lipids can be used in aerobic and anaerobic respiration when needed.

What feature of carbon makes it most suitable as a basis for life?

• Its abundance in nature

• Its bonding properties

• Its reactivity to light

• Its presence in the early atmosphere of the Earth