Hawassa University Daye Campus, Biology Department
Cell Biology Test-1 for 2nd Year Regular Students
Course code: Biol 2051 Cr. Hr: 3 Academic year: 2024 Weight: 20% Time allowed: 70min.
Name …………………………………… ……ID № ……………… Sign……………….
I. Write TRUE if statement is correct or FALSE if it is incorrect (1 Pt each)
1. TEM has a much higher resolution power than SEM.
2. Like mitochondria, chloroplasts contain ribosomes, DNA and harnessing energy
3. The basic foundation of biological membranes is a lipid bilayer, which forms spontaneously.
4. Prokaryotic cells have a cell wall, but eukaryotic cells never do.
5. All cells contain DNA as their genetic material.
6. Tight junctions allow the passage of materials between cells.
II. Match the following types of organelles “column A” with corresponding their role
“column B” (1 pt each).
“A”
“ B”
1. Nucleolus
A. Microtubules assembly center
2. Chromatin
B. Provide shape,strenght and structure for the cells
3. Centrosome
C. Synthensize(assembly) site of ribosomes
4. Mitochondria
D. Produce energy for the cell in form of ATP
5. Golji body
E. synthesis of lipids, detoxify drugs/ poisons or storage of Ca++
6. Cytoskeleton
F. Central vacuole membrane
7. Smooth ER
G. Complex of DNA and its histone protein
8. Tonoplast
H. Modifying, sorting, trafficking and transporting proteins
I. Destroy intracellular debris
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III. Choose the correct answer and ENCIRCLE the letter of your choice ( 1 pt each)
1. By using his own microscope, who observed hundreds of very small hexagonal ‘boxes’ or
‘chambers’ in outer bark of trees and coined these chambers as “cell”?
A. Anton von Leeuwenhoek
B. Robert Hooke
C. Matthais Schleiden
D. Rudolph Virchow
2. Which of the following components NOT found in plants cells?
A. Ribosomes
B. DNA
C. Cell wall
D. Lysosome
3. Cytoskeletons classified into different types like Actin, intermediate and microtubules base on:
A. Shape of the cell
B. Diameter and protein composition
C. Size if the cell
D. Presence or absence of nucleus
4. A large organelle found in eukaryotic cells that genetically controls the cell's activities is the:
A. Chloroplast
B. Nucleus
C. Vacuole
D. Centriole
5. Which structure is NOT part of the endomembrane system?
A. Nuclear envelope
B. plasma membrane
C. Chloroplast
D. Golgi apparatus/ER
6. Vesicles like Lysosome, peroxisome and vacuoles are collectively known as
A. Traffic police of the cell
B. Digestion center of the cell
C. Controlling center of the cell
D. Protein machinery of the cell
7. Which of the following sequence of protein synthensis is correct?
A. E. reticulum → Golgi body → protein → Nucleus→ Ribosome
B. Nucleus→ Ribosome → Golgi body → E. reticulum → protein
C. Ribosome → E.reticulum → Golgi body → Nucleus→ protein
D. Nucleus→ Ribosome → E. reticulum → Golgi body → protein
8. Which of the following is NOT true about cell wall?
A. It is fully permeable membrane (porous)
C. Secreted by the cell itself
B. Animals have no cell wall
D. It made up of phospholipid bi-layer
9. In each countertransport, the sodium-potassium pumps transfer
A. 2K+ out and 3Na+ in
B. 2K+ in and 3Na+ out
C. 2K+ out and 3Na+ in
D. 3K+ in and 2Na+ out
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Item No 10 based on the following structure
10. Which of the following membrane model fit the above structure?
A. Davson-Danielli model.
B. David Robertson unit membrane model
C. Key-lock model
D. Singer and Nicolson's fluid mosaic model
IV. Fill the blank space with appropriate words (1.5 pts each)
1. The ExtraCellular Matrix (ECM) of plants is the ……………………....
2. In an electron microscope, the image is focused by…................................
3. An extensive system of folded membranes that divides the interior of eukaryotic cells into
compartments and channels is termed as………………………………
V. Essay (3pts each)
1. Describe the early and modern cell theory briefly.
2. List and explain the factors that affect the plasma membrane fluidity.
3. Describe the membrane transport mechanisms separately with appropriate examples.
4. Elaborate the three types of the cell junctions briefly.
I= 6%
II= 8%
III= 10%
IV=4.5 % V=12%
By: Ararsa N. (MSc. in parasitology)
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Total= 40%
20%