Biological Sciences Quiz 6 (20 MCQs)

Quiz Instructions

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1. A ..... may be defined as the fundamental unit of heredity, fromed as a sequence of bases in a DNA chain.

Correct Answer: B) Gene.

2. Which vitamin is important for bone development?

Correct Answer: B) Vitamin D.

3. ..... is a carbohydrate that forms plant cell walls, and ..... makes hard shells.

Correct Answer: C) Cellulose, chitin.

4. The combination of the earth orbiting the sun and tilt of the earths axis gives

Correct Answer: C) Annual rhythm.

5. The estimated number of genes in a human cell is 100, 000 and the number of nucleotide pairs in human DNA is.

Correct Answer: D) 3 billion.

6. Consists of functionally related organs.

Correct Answer: C) ORGAN SYSTEM.

7. Enzymes are..

Correct Answer: D) Proteins.

8. The biosphere includes plants and animals that live

Correct Answer: C) On land, in water, and in the air.

9. The substances on which the enzymes act are called.

Correct Answer: B) Substrates.

10. Plants use energy to synthesize sugar and starch through the process of .

Correct Answer: B) Photosynthesis.

11. A process in which micro-organisms in the absence of oxygen breakdown carbohydrates into various organic compounds is called

Correct Answer: D) Respiration.

12. What phyla do all vertebrates belong in?

Correct Answer: A) Chordates.

13. Penguin the flight less bird, is found in .

Correct Answer: B) Antarctica.

14. A variety of organisms which always produce offspring indentical to the parent is called a.

Correct Answer: A) True breeding variety.

15. Oxygen combines with digested food molecules in body cells to release the energy stored in them. This process is called ..... .

Correct Answer: A) Respiration.

16. Which of the following genotypes is homozygous recessive?

Correct Answer: B) Rr.

17. Cell part that is NOT present in animal cell and present in plant cell?

Correct Answer: C) Cell wall.

18. Muscle tissue, skin tissue, and skeletal tissue.

Correct Answer: B) TISSUE.

19. What is the term used to describe choosing specific parents to get desirable characteristics in offspring? "

Correct Answer: D) Selective breeding.

20. Proteins are considered to be the most common large molecules in.

Correct Answer: C) Living organisms.