Page 9 - PRE-U STPM BIOLOGY TERM 1

Biology Term 1 STPM Chapter 2 Structure of Cells and Organelles

Characteristic Prokaryotic cell Eukaryotic cell

2010 6 Pillus May be present for No such structure present
attachment

7 Nucleus Absent, with no Present, with nuclear
nuclear membrane envelope
2
8 Nucleolus Absent, ribosome Present, for ribosome
formed in cytoplasm synthesis
2011 9 DNA/ Circular, ‘naked’ Linear, combined with
Chromosomes DNA with no histone histone to form X or
(contained in the inverted V shapes
nucleiod region)

10 Organelles Few, none with Many, three with
envelope envelopes
11 Ribosomes Smaller types, 70S (18 Bigger types, 80S (22 nm)
nm)
12 Mesosome or Mesosome or plasma Mitochondria for
mitochondria membrane for respiration
respiration

13 Spindle No spindle during cell Spindle present during
division mitosis and meiosis

14 Vesicles for Foldings of plasma Chloroplasts involved in
photosynthesis membrane for photosynthesis
photosynthesis
15 Vesicles for Vesicles or plasma No structure is capable of
nitrogen membrane can fix such ability
fixation nitrogen

16 Cytoplasm Present Present
and plasma
membrane

Quick Check 1

1. Why are prokaryotic cells considered as primitive?
2. What are the different forms of prokaryotic organisms?

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