A Level Biology Edexcel B Exam Questions With 100% Verified Answers
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Course
A Level Biology
Institution
A Level Biology
A Level Biology Edexcel B Exam Questions
With 100% Verified Answers
Features and function of the Nucleus - answer- Present in all eukaryotic cells
- Surrounded by double membrane (nueclear envelope)
- Membrane contains nuclear pores to allow movement of mRNA and ribosomes out of nucleus,
and e...
- Genetic material in prokaryotic cells often found as single circular strands
Features and function of Pilus - answer✔- Thread like structures found on cell surface membrane
- Enables bacteria to attach to other cells and surfaces
- Allows plasmids to be passed from cell to cell
Features and function of 70s Ribosomes - answer✔- Large 50s subunit
- Small 30s subunit
- Site of protein synthesis
Features and function of cell wall (prokaryotic) - answer✔- Made of peptidoglycan
- Provides strength and support to the cell
Difference in structure of Gram negative and Gram positive bactera - answer✔Gram positive:
- Thick layer of peptidoglycan
- Inner plasma membrane
Gran negative:
- Thin layer of peptidoglycan
- Outer lipopolysaccharide membrane
Gram Staining Test Procedure + Results - answer✔1. Crystal violet solution for 1 minute, then
wash with water
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