Page 57 - PRE-U STPM BIOLOGY TERM 1

Biology Term 1 STPM Chapter 2 Structure of Cells and Organelles

(ii) Agranulocytes
• Agranulocytes do not have granules in their cytoplasm.
They are formed in the bone marrow and then get into
the blood stream.
• Agranulocytes are divided into monocytes and
lymphocytes.
2

Monocyte Lymphocyte
Figure 2.60 Types of agranulocytes
• Monocytes come out from the capillary into the
tissue fluid becoming bigger to form macrophages.
Macrophages engulf bacteria and dead tissue cells.
• Lymphocytes are divided into T lymphocytes, which
mature in the thymus gland and B lymphocytes, which
mature in the bone marrow. B lymphocytes produces
antibody and T lymphocytes help the B lymphocytes.

Quick Check 5

1. Plants seem to have lesser types of cells but more types of tissues than animals. Explain.
2. How are organs organised in plants and animals?

STPM PRACTICE 2

Objective Questions 3. A student examined a cell under a
microscope. He found that the cell has a cell
1. Why bacteria is determined as prokaryotes?
A It has a linear DNA wall. The cell does not contain membrane-
B The DNA has no ends bound organelles. What conclusion can be
C The DNA forms a complex with made by him from this observation?
histones A It is a bacterial cell
D The DNA is surrounded by specific B It is a plant cell
membrane C It is an animal cell
D It is either a plant or an animal cell
2. Which about a prokaryote is not correct?
A Its genetic material is in the nucleoid. 4. Prokaryotic cell can be differentiated from
B Its DNA combines with histone. eukaryotic cell whether
C It propagates via binary fission. A the cell has ribosomes or not
D It has 70S ribosomes. B the cell has a rigid cell wall or not

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