IB Biology: Cell Theory Online Test

In an electron micrograph, a DNA molecules appear 1 mm wide. The magnification of micrograph is 500,000. What is the width of DNA molecule?


What is the order of size of cell components?

(from left to right, from largest to smallest)


Differentiation results in cells:


Which scientist first used the term cell?


The diameter of living cells varies considerably. Typical diameters are:-

a prokaryote, such as Streptococcus- 750nm

a eukaryotic cell, such as white blood cell- 15 m

Given these measurements, the diameter of the white blood cell is how many times greater than the prokaryote?


What happens as a cell grows larger?


What is the correct order of increasing size for the following biological structures?

I- The diameter of a virus

II- The diameter of a bacterium

III- The diameter of a cell surface membrane

IV- The diameter of a eukaryotic cell


What is the ratio of the relative size of a eukaryotic cell, a virus and a prokaryotic cell?


Which observations support the cell theory?

I- Mature red blood cells do not contain a nucleus.

II- Cells from a multicellular organism can be cultured in isolation.

III- Muscle fibres contain many nuclei.

IV- All cells develop from pre-existing cells


What describes tissues?


One early piece of evidence supporting the cell theory was the observation that


Cells are limited in size by the


Stem cells can form many kinds of cells.In contrast, most body cells cannot form different types of cells. For example, skin cells can only make skin cells, and nerve cells only make nerve cells. Which statement best explains why skin cells will never become nerve cells?






























Description:

Hello,

This test concerns on the following assessment statement from the IB syllabus guide 2009:-
2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.1.7, 2.1.8

2.1.1: Outline cell theory
2.1.2: Discuss the evidence for the cell theory
2.1.3: State that unicellular organisms carry out all the functions of
life
2.1.4: Compare the relative sizes of molecules, cell membrane
thickness, viruses, bacteria, organelles and cells, using the
appropriate SI unit
2.1.5: Calculate the linear magnification of drawings and the actual
size of specimens in images known magnification
2.1.6: Explain the importance of the surface area to volume ratio as
a factor limiting cell size
2.1.7: State that multicellular organisms show emergent property
2.1.8: Explain that cells in multicellular organisms differentiate to
carry out specialized functions by expressing some of their
genes but not others

Tags:

Biology

Discussion

左岸

I am not quite sure that skin cells and nerve cells really have same DNA,but they only use their unique part?

2757 days 20 hours 4 minutes ago

naeem akhtar

very fine test so nice of u

4112 days 17 hours 14 minutes ago

sandeep mistry

excellent objective test on CELL BIOLOGY.
I attempted this test 5 times

4152 days 4 hours 47 minutes ago

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