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QLDBiologyQuick questions
Unit 1: Cells and multicellular organisms
Quick questions on Cell theory, prokaryotic and eukaryotic cells (QCE Biology Unit 1)
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the cell theory?Show answer
The modern cell theory has three core postulates:
What are prokaryotic cells?Show answer
Prokaryotes are unicellular organisms whose genetic material is not enclosed in a nucleus. They fall into two domains:
What is q1?Show answer
State the three postulates of the cell theory and identify which postulate is supported by the observation that viruses cannot replicate outside a host cell. [3 marks]
What is q2?Show answer
A microscope image of two cells, X and Y, shows X is 2 micrometres long with a single circular chromosome free in the cytoplasm, while Y is 25 micrometres long with a nucleus and visible mitochondria. Classify each cell, identifying two distinguishing features used. [4 marks]
What is q3?Show answer
Refer to the Mt Isa lead-tolerant bacterial example. (a) Identify the domain to which _Cupriavidus metallidurans_ belongs. (b) Explain why the absence of membrane-bound organelles does not prevent the cell from concentrating lead.
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