Ethiopia Grade 12 Biology: Unit I: Exam Text Book Question Answers: Practice the sample multiple-choice question for the Grade 12 Biology Entrance examination.
Ethiopia Grade 12 Biology: Unit I: Bacteria
- 1.1 Bacteria
- 1.2 The ecology and uses of bacteria
- 1.3 What are viruses?
Question Answers
1. 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.
2. 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.
3. 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.
4. 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.
5. All Bacteria is in same shape?
- A) True
- B) False
Answer: B) False there are several Shapes, Sizes and arrangements.
6. 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
7. 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
8. Which of caome under rod-shaped bacteria?
- A) singular
- B) cocci
- C) bacilli
- D) spirochaetes
Answer: C) bacilli (Singular, bacillus) — rod-shaped bacteria
9. 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.
10. 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.
11. 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).
12. 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.
13. 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
14. 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
15. 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
16. 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
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. Membrane-bound organelles include:
- A) the nucleus
- B) chloroplasts
- C) mitochondria
- D) all Of the above
Answers: A) the nucleus
19. 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
20. Disease-causing bacteria can be transmitted by:
- A. Sexual intercourse
- B. Droplet infection
- C. Eating contaminated food
- D. All Of the above
Answers: D
21. Which of the following is not an infectious disease
- A.) Tuberculosis
- B.) AIDS
- C.) Coronary heart disease
- D.) the common cold
Answers: B
22. 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
23. DNA can be trahsférred into maize using:
- A.) Plasmids
- B.) The gene gun
- C.) Agro bacterium
- D.) Viruses
Answers: The gene gun
24. Bacteria are important because they
- A.) cause diseases
- B.) are used in many industrial processes
- C.) recycle mineral elements such as carbon, nitrogen and sulphur through ecosystems
- D.) all of the above
25. Which of the following theory says that infectious diseases are caused by micro-organisms?
- A.) Germ theory
- B.) Pathogen theory
- C.) Infectious disease theory
- D.) all of the above
Answers: A. Germ theory
26. Organisms that cause disease are called ______
- A.) Germ
- B.) Pathogen
- C.) Infectious disease
- D.) Virus
Answers: B. Pathogen
27. Which of the following is/are a type of micro-organism?
- A.) Bacteria
- B.) Viruses
- C.) Fungi
- D.) Protozoa
Answers: All of the above
28. Which of the micro-organism caused Malaria?
- A.) Bacteria
- B.) Viruses
- C.) Fungi
- D.) Protozoa
Answers: D
29. The origin of micro-organisms that infect other people is called the _____
- A.) Reserve of infection
- B.) Recursive of infection
- C.) Reservoir of infection
- D.) Servoir of infection
Answers: C
30. Which of the following may include Reservoirs of infection?
- A.) human beings
- B.) soil
- C.) water
- D.) food
Answers: All of the above
31. Which of the following can be manufacture by using Bacteria?
- A.) bread
- B.) alcohol
- C.) irgo or yoghurt
- D.) vinegar
Answers: All of the above
32. Genes can be transferred into other cells using
- A.) Plasmids
- B.) The gene gun
- C.) Agro bacterium
- D.) Vectors
Answers: D
33. Genetic modification of plants can be done using ____ technique.
- A.) Agrobacterium
- B.) Crispr
- C.) Agro bacterium
- D.) Plant cell technique.
Answers: A
29
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It is a very good practice for us… well done. But I have question on number 14. Isn’t Gram’s stain called a differential stain because it differentiates between bacteria staining gram negative pink and gram positive purple? And also on question number 18, aren’t chloroplast and mitochondria membrane bounded? Actually double membrane bounded? And lastly on question number 13, aren’t all of the reasons responsible for virus to be considered “non living”? Please explain it to me. Thank you.
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