ONE-EIGHTH STAGE 2025
Presbyterian Boys' Sec. School: 55 points
Oti Boateng SHS: 35 points
T.I. AMASS, Kumasi: 34 points
Our Lady of Grace SHS: 56 points
Bishop Herman College: 39 points
Ejisuman SHS: 27 points
GSTS: 50 points
Nkwatia Presbyterian SHS: 45 points
Ashaiman SHS: 28 points
ROUND 4 - TRUE OR FALSE
FIRST SET OF QUESTIONS
1. Mitochondria DNA is free of nuclei envelope
ANSWER: TRUE
EXPLANATION:
Mitochondrial DNA is located inside the mitochondrion, not in the nucleus.
Therefore, it is not enclosed by a nuclear membrane (nuclear envelope).
Its structure is similar to bacterial DNA because mitochondria evolved from prokaryotes.
2. Mitochondria DNA is both paternal and maternal
ANSWER: FALSE
EXPLANATION:
Mitochondrial DNA is strictly maternally inherited.
During fertilization, the sperm’s mitochondria are destroyed, so only the mother’s mitochondrial DNA is passed on to the offspring.
3. Mitochondria DNA is packed into chromatin
ANSWER: FALSE
EXPLANATION:
Chromatin is formed when nuclear DNA wraps around histone proteins.
Mitochondrial DNA does not use histones and therefore does not form chromatin.
Instead, it is organized into nucleoid-like structures inside the mitochondrion.
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PRACTICE QUESTIONS
1. QUESTION: Mitochondrial DNA is circular.
ANSWER: TRUE
EXPLANATION:
It is like bacterial DNA.
2. QUESTION: Mitochondria have their own ribosomes.
ANSWER: TRUE
EXPLANATION:
They are 70S, like those of bacteria.
3. QUESTION: Mitochondria are thought to have come from bacteria that lived inside other cells.
ANSWER: TRUE
EXPLANATION:
This is the endosymbiont theory.
4. QUESTION: Chloroplasts also contain their own DNA.
ANSWER: TRUE
EXPLANATION:
They are also thought to come from bacteria.
5. QUESTION: Mitochondrial DNA codes for every protein in the mitochondrion.
ANSWER: FALSE
EXPLANATION:
Most mitochondrial proteins are coded by nuclear genes.
6. QUESTION: Mitochondria divide by binary fission.
ANSWER: TRUE
EXPLANATION:
New mitochondria come from existing ones.
7. QUESTION: Mitochondrial DNA is found in the nucleolus.
ANSWER: FALSE
EXPLANATION:
It is found in the mitochondrial matrix.
8. QUESTION: Mitochondrial DNA is used to trace ancestry through the female line.
ANSWER: TRUE
EXPLANATION:
It passes from mother to child.
9. QUESTION: Mature mammalian red blood cells contain many mitochondria.
ANSWER: FALSE
EXPLANATION:
Mature red blood cells have no mitochondria.