Page 18 - Cell biology PDC 2024

 Pigments ex: hemoglobin of red blood cells and melanin
manufactured by melanocytes of the skin, hair and retina. These
pigments have protective functions in skin and aid in the sense of
sight in the retina.

The difference between prokaryotic and eukaryotic cells:

nucleus Prokaryotes Eukaryotes

nucleolus unicellular multicellular
DNA Poorly defined due
to lack of membrane Well defined and
Membrane bound surrounded by
organelles absent nuclear membrane
Ribosomes Naked DNA,
Reproduction circular, genes with present
Ex no introns and DNA
found in cytoplasm DNA with histones,
linear, genes may
absent contain introns and
DNA found in
70s nucleus
Asexual (binary
fission) Present ex:
Bacteria and blue mitochondria, Golgi
green algae body

80s

Sexual (meiosis) or
asexual 9mitosis)

Fungi, animal and
plant cells

By the end of this chapter the student should know:

How to develop an integrated and clear understanding of
the correlation between structure and function of different
cell organelles and membranes.

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