Unit 2: Biological Molecules

What are Biological Molecules?

“Biological Molecules” is a key chapter that delves into the essential molecules that form the basis of life. This unit explores the types and functions of biological molecules, including carbohydrates, proteins, lipids, and nucleic acids. Students will learn about the structure, properties, and roles of these molecules in cellular processes and life functions. The chapter emphasizes the significance of these macromolecules in maintaining the integrity and function of living organisms.

Key Topics in Biological Molecules:

• Carbohydrates: Understanding the structure, types, and functions of carbohydrates, including sugars and starches.
• Proteins: Exploring the building blocks of proteins (amino acids), their structure, and their vital roles in cellular functions and metabolism.
• Lipids: Learning about the various types of lipids, such as fats, oils, and phospholipids, and their functions in energy storage and cell membrane structure.
• Nucleic Acids: Investigating the structure and function of DNA and RNA, and their roles in genetic information storage and transfer.
• Enzymes: Examining the function of enzymes as biological catalysts and their importance in biochemical reactions.

Benefits of Studying Biological Molecules:

• Fundamental Knowledge: Provides essential understanding of the molecular basis of life, which is crucial for advanced biological studies.
• Insight into Cellular Functions: Enhances comprehension of how biological molecules contribute to cell structure, function, and metabolism.
• Application in Medicine and Research: Equips students with knowledge applicable to fields such as biochemistry, molecular biology, and medicine.
• Foundation for Further Learning: Prepares students for more complex topics by establishing a solid grasp of the chemical principles underlying biological processes.

This chapter is fundamental for students to understand the molecular components that drive the complexity and diversity of life. Mastering the concepts of biological molecules is key to advancing in the study of biology and related scientific disciplines.

1. Animals obtain carbohydrates mainly from

a. Glucose
b. Starch
c. Sucrose
d. Glycogen

2. Peptide bond is a

a. C-N link
b. C-O link
c.N-H link
d. C-H link

3. Globular proteins differ from fibrous proteins in

a. having amino acid
b. their repeating units joined by peptide bond
c. being soluble in aqueous medium
d. being non-crystalline

4. Which of the following amounts of bases are more likely to be found in organism

a. adenine 30.9% and cytosine 30.7%
b. Guanine 27.5% and adenine 27.8 %
c. cytosine 19.8% and thymine 20.0%
d. adenine32% and thymine 31.9%

5.Which of the following kinds of atoms donot occur in carbohydrates

a. carbon
b. hydrogen
c. nitrogen
d. oxygen

6. Amino acids are arranged in proper sequence during protein synthesis to the instruction transcribed on

a. Transfer RNA
b. Ribosomal RNA
c. Messenger RNA
d. DNA