IB Biology Topic 1.1

Which statements make up the cell theory?

• All living things are made of cells.

• All cells are microscopic.

• Cells are the smallest unit of life.

• All cells come from pre-existing cells.

Why do multicellular organisms have emergent properties?

• They have more genes than unicellular organisms.

• Properties of unicellular organisms are enhanced by having many cells.

• All of their genes are expressed whereas unicellular organisms express only some.

• They show properties that can only result from the interaction of many cells.

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What happens to the cell surface area to volume ratio as a cell grows?

• It decreases, so production of waste material is reduced.

• It increases, so mineral ion absorption is increased.

• It increases, so osmosis is reduced.

• It decreases, so rate of gas exchange is too low.

Which feature of striated muscle cells allows them to be considered as a possible exception to the cell theory?

• They are found in multicellular organisms.

• They contain more than one nucleus.

• They are specialized for movement.

• They do not carry out mitosis.

If cells of a multicellular organism have the same genes, how can there be many different cell types in a body?

• Some genes but not others are expressed in each cell type.

• Cells lose some genes as development occurs.

• Genes do not determine the structure of a cell.

• Cells must practice division of labour in order to survive.

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What determines the rate at which nutrients and waste are exchanged between the cell and the environment?

• surface area

• surface ratio

• volume ratio

• surface area to volume ratio

A paramecium (a single- celled organism) captures and eats a bacteria cell. What life function is this an example of?

• excretion

• nutrition

• response

• homeostasis

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Data that is measured and expressed in NUMBERS is called

• quantitative data
• qualitative data
• forged data
• minute data

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Bias occurs when a scientist uses a preference or a particular point of view that is personal rather than scientific. 

• True
• False

The factor being tested in an experiment, the one that *I* change, is the

• independent variable
• dependent variable
• control group
• hypothesis

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