Ethiopia Grade 12 Biology Unit I: Exam Text Book Question Answers
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Grade 12 Biology Unit I: Bacteria in Ethiopia
1. All Bacteria is in same shape?
- A) True
- B) False
Answer: B) False there are several Shapes, Sizes and arrangements.
2. Bacilli refer to
- A) Size of a Virus
- B) Shape of Various
- C) Size of a Bacteria
- D) Shape of Bacteria
Answer: D) Shape of Bacteria : bacilli (Singular, bacillus) — rod-shaped bacteria
3. Which of caome under rod-shaped bacteria?
- A) singular
- B) cocci
- C) bacilli
- D) spirochaetes
Answer: C) bacilli (Singular, bacillus) — rod-shaped bacteria
4. What is the Meaning of spirochaetes?
- A) spherical bacteria
- B) rod-shaped bacteria
- C) corkscrew-shaped bacteria
- D) spiral or corkscrew-shaped bacteria
Answer: D) spirochaetes — spiral or corkscrew-shaped bacteria
5. Which of the following is a type of fungal microorganism?
- A) Bacterium
- B) Protozoan
- C) alga
- D) yeast
Answer: D) Yeast is single-celled fungi and a type of fungal microorganism.
6. Which of the following is a type of fungal microorganism?
- A) Bacterium
- B) Protozoan
- C) alga
- D) yeast
Answer: D) Yeast is single-celled fungi and a type of fungal microorganism.
7. Which Microorganism have just one prokaryotic cell?
- A) Bacteria
- B) Helminth
- C) Protozoan
- D) Mould
Answer: A) Bacteria Bacteria have prokaryotic cells. In prokaryotic cells, there is no true nucleus separated from the rest Of the cell by a membrane. Instead, the DNA of the bacterium forms a continuous loop that is intermingled with the cytoplasm.
8. Which of the following Microorganism are photosynthetic organisms?
- A) Fungi
- B) Helminths
- C) Algae
- D) Virus
Answers: (C) Algae are photosynthetic organisms that extract energy from the sun and release oxygen and carbohydrates into their environment.
9. Which of the following Microorganism having a single cell?
- A) Amoeba
- B) Plant
- C) Human
- D) None of the above
Answers: (A) An amoeba, sometimes written as “ameba”, is a term generally used to describe a single celled unicellular organism.
10. Can Microorganism is seen with the naked eye?
- YES
- NO
Answer: NO: These microorganisms or microbes are so small in size that they cannot be seen with the naked eye. It can be seen with a magnifying glass or microscope.
11. DNA can be transferred into maize using:
A.) Plasmids
B.) the gene gun
C.)Agro bacterium
D.) viruses
12. In the sulphur cycle, the main source of sulphur of plants is
- A) sulphur in rocks
- B) sulphates in the air
- C) sulphur in water
- D) sulphates in soil
13. Which of the following is not an infectious disease
- A.) Tuberculosis
- B.) AIDS
- C.) Coronary heart disease
- D.) the common cold
14. Disease-causing bacteria can be transmitted by:
- A. Sexual intercourse
- B. Droplet infection
- C. Eating contaminated food
- D. All Of the above
15. Sources of infectious organisms that spread to infect Others are called:
- A) hosts Of infection
- B) sources Of infection
- C) reservoirs Of infection
- D) sites of infection
16. Membrane-bound organelles include:
- A) the nucleus
- B) chloroplasts
- C) mitochondria
- D) all Of the above
Answers: A) the nucleus
17. is true to say of bacterial cells that:
- A) none can photosynthesise
- B) only some can respire
- C) none contain ribosomes
- D) none contain chloroplasts
Answers: D) none contain chloroplasts Bacteria do not contain the chloroplast organelle,
18. Viruses can parasites
- A) Only Animal cells
- B) Only Plant cells
- C) Only bacterial cells
- D) All of the above
Answer: D) all of the above
19. Compared with Gram-positive bacteria, Gram-negative bacteria.
- A) have an extra membrane outside the cell wall
- B) are more resistant to antibiotics
- C) produce more dangerous endotoxins
- D) all of the above
Answer: D) all of the above
20. Gram’s stain called a differential stain because of
- A) it Stains bacterial cells, but not fungi
- B) it stains some bacteria purple and other pink
- C) it Stains viruses, but no Other organisms’;
- D) it Stains some fungal cells purple ah4 Others pink
Answer: A) it Stains bacterial cells, but not fungi
21. Viruses are sometimes not considered as living organisms because:-
- A) they do not have any organelles found in cells
- B) they are incapable OfinAependent reproduction
- C) they cannot out any metabolic processes
- D) all Of the above
Answer: C) they cannot out any metabolic processes
22. Protozoa are:
- A) multicellular organisms
- B) one-celled animals
- C) Members Of the group Protoctista
- D) Unicellular
Answer: D) Protozoa is an informal term for single-celled eukaryotes.
23. Gram’s staining technique used which purpose?
- A) Classifying bacteria
- B) Classifying Protozoan
- C) Classifying alga
- D) Classifying yeast
Answer: A) Classifying bacteria (named after Hans Christian Gram, who developed the technique in 1884).
