SBA — Single Best Answer · Review
Question 533
Biochemistry → General
Classification
Question
SSBAQuestion Header
Which combination of features most specifically identifies a mitochondrion?
Question Stem
—
Options
A
Single membrane, acid hydrolases and Golgi origin
B
No limiting membrane, two ribosomal subunits and protein synthesis
C
Double membrane, respiratory chain on cristae and its own DNA
D
Double nuclear membrane, pores and continuity with endoplasmic reticulum
E
Single membrane, hydrogen-peroxide detoxification and β-oxidation
Explanation
Mitochondria have a double membrane. The inner membrane forms cristae containing the respiratory chain for ATP synthesis by oxidative phosphorylation, and mitochondria possess their own DNA and can self-replicate.
Option Validity
A) This describes features associated with lysosomes rather than mitochondria.
B) Ribosomes lack a limiting membrane and are responsible for protein synthesis.
D) A double porous membrane continuous with endoplasmic reticulum describes the nuclear membrane.
E) Hydrogen-peroxide detoxification and β-oxidation are characteristic functions of peroxisomes.
Further Reading
Richa Saxena. Textbook for MRCOG-1: Basic Sciences in Obstetrics & Gynaecology. Biochemistry and Nutrition — Biochemistry — Mitochondria. Printed pages 126–127.