Unit 1 Biology Edexcel Pearson International A Level

Which of the following is NOT a major biological macromolecule?

• Lipids
• Proteins
• Carbohydrates
• Ribosomes

Which of the following is a risk factor for cardiovascular disease?

• Regular exercise
• Healthy diet
• Avoiding smoking
• High cholesterol levels

The cell membrane is primarily composed of what type of biological molecule?

• Lipids
• Proteins
• Carbohydrates
• Nucleic acids

Which transport method allows small uncharged molecules to freely pass through the cell membrane?

• Active transport
• Facilitated diffusion
• Osmosis
• Endocytosis

Which characteristic of enzymes allows them to speed up the rate of chemical reactions?

• Reducing the activation energy
• Providing an alternative reaction pathway
• Increasing the concentration of reactants
• Stabilising the transition state

What is the primary function of the double-helix structure of DNA?

• To provide genetic information
• To facilitate protein synthesis
• To enable DNA replication
• To protect the genetic material

Which cellular organelle is responsible for protein synthesis?

• Nucleus
• Mitochondria
• Ribosomes
• Golgi apparatus

During DNA replication, what is the role of the enzyme DNA helicase?

• To separate the DNA strands
• To synthesise new DNA strands
• To proofread the new DNA strands
• To ligate the Okazaki fragments

Which type of mutation involves the addition or deletion of one or more nucleotides in the DNA sequence?

• Point mutation
• Frameshift mutation
• Missense mutation
• Nonsense mutation

Cystic fibrosis is an inherited genetic disorder caused by a mutation in which gene?

• CFTR gene
• FIX gene
• BRCA1 gene
• DMD gene