What distinguishes unicellular from multicellular organisms?
Unicellular organisms have one cell performing all life functions, multicellular have specialized cells.
What is the order of the organisational hierarchy in biology?
Cell → Tissue → Organ → Organism.
What do all cells of the same organism originate from?
One egg cell.
What allows cells with the same DNA to perform different functions?
Different gene expression.
What is the structural form of DNA?
Two strands wound into a double helix.
Which bases pair together in DNA?
Adenine pairs with thymine and guanine pairs with cytosine.
What is a gene in terms of DNA?
A portion of DNA containing genetic information.
What happens when a gene is active?
Its information is used to produce a protein and a cellular function.
What does the nucleus contain in a cell?
Genetic information.
What is the role of the extracellular matrix in tissues?
It maintains cohesion between cells and contributes to tissue formation.
Answer 9 questions on Organisation des êtres vivants.
1. What distinguishes a multicellular organism from a unicellular organism?
2. Which sequence correctly represents the organisational hierarchy from simplest to most complex?
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