Ethiopia Grade 12 Biology: Unit I: Exam Text Book Question Answers

Ethiopia Grade 12 Biology: Unit I: Exam Text Book Question Answers: Practice the sample multiple-choice question for Grade 12 Biology Entrance examination.

Ethiopia Grade 12 Biology: Unit I: Bacteria

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

21. Which of the following is not an infectious disease

• A.) Tuberculosis
• B.) AIDS
• C.) Coronary heart disease
• D.)  the common cold

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