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Cells (SL & HL)
Test Description: Questions to review Topic 2 (Cells) from the IB Biology syllabus.
Instructions: Answer all questions to get your test result.
1) What is essential for diffusion?
A
A protein
B
A concentration gradient
C
A selectively permeable membrane
D
A source of energy
2) Which of the following is a characteristic of organelles?
A
They are only found in euyarkyotic cells
B
They are all membrane bound
C
They are sub-cellular structures
D
They are only found in prokaryotic cells
3) If a red blood cell has a diameter of 8 um and a student shows it with a diameter of 40 mm in a drawing, what is the magnification of the drawing?
A
X 5
B
X 0.2
C
X 5000
D
X 0.0002
4) What is facilitated diffusion?
A
The movement of a particle down a concentration gradient helped by active pumping.
B
The passive movement of a particle across a cell membrane via a channel protein.
C
The passive movement of a particle through the phospholipid bilayer of the cell membrane.
D
The movement of a particle up a concentration gradient helped by active pumping.
5) Which of the following is required for osmosis to occur?
A
A fully permeable membrane
B
A solute concentration gradient
C
ATP
D
An enzyme
6) Colchicine is a chemical substance that prevents the formation of microtubules. What stage of mitosis would be prevented, if dividing cells were treated with colchicine?
A
Supercoiling of chromosomes
B
Replication of DNA
C
Breaking down of the nuclear membrane
D
Separation of gentically identical chromosomes (chromatids)
7) What two molecules are the principal components of membranes?
A
protein and lipid
B
glycogen and protein
C
lipid and glycogen
D
cellulose and protein
8) The widtch of a human hair is 0.1 mm. What is the width in um?
A
10,000 um
B
1000 um
C
100 um
D
10 um
9) If a cell plate is beginning to form and nuclei are re-forming at opposite ends of a cell, what kind of cell is this?
A
A plant cell in telophase
B
An animal cell in telophase
C
An animal cell in prophase
D
A plant cell in prophase
10) What ratio limits the size of cells?
A
The surface area to mass
B
The surface area to volume
C
The rate of metabolism to mass
D
The mass to volume
*select an answer for all questions
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