IB DP Biology Topic 2: Molecular biology 2.4 Protein Question Bank SL Paper 1

IB Biology SL (Standard level)- 2024 – Practice Questions- All Topics

Topic 2.4 Proteins

Topic 2 Weightage : 20% 

All Questions for Topic 2.4-Amino Acids, Peptide Bonds, Protein Structure, Denaturation, Gene ⇒ Polypeptide, Proteome, Protein Functions, The pH Scale, Fibrous vs Globular Proteins, Amino Acid Polarity

Question

The diagram shows the structure of E. coli ribonuclease HI, a bacterial protein consisting of one polypeptide chain.

Which level(s) of protein structure is/are shown?
A. Alpha helix only
B. Quaternary only
C. Primary and secondary
D. Secondary and tertiary

▶️Answer/Explanation

Ans: D

E. coli has several ribonucleases that are involved in RNA processing and degradation, such as RNase E, RNase G, RNase II, RNase III, and RNase T. The primary and secondary structures of these ribonucleases may vary depending on their functions and mechanisms.

Question

Which protein is identified with its function?

 

Protein

Function

A

collagen

provides strength and support for tissues and organs

B

rhodopsin

enzyme found in tears

C

insulin

raises blood glucose concentrations

D

immunoglobulin

helps in blood clotting

▶️Answer/Explanation

Ans: A

Collagen proteins are the most abundant proteins in the body. They provide structure, strength and support to various tissues, such as skin, bones, muscles, tendons and ligament. Collagen proteins are made of amino acids, mainly proline, glycine and hydroxyproline. They provide structure and support to these tissues. If you meant “coiled-coil proteins”, they are involved in many cellular processes such as vesicle transport, cell division, and muscle contraction.

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