Zefan's Science Notebook

Formby High School • KS3 to GCSE Journey

← Back to Notebook Cover Entry 06

🎯 Can You Beat Zefan's Science Quiz?

✍️ "I created these 11 questions based on all my lab discoveries, DNA calculations, and research notes. See if you can get all 11 correct!"

Question 1 of 11

Which organelle is known as the control centre or "brain" of the cell?

Mitochondria Nucleus Cytoplasm Ribosome

Question 2 of 11

What are the 3 extra structures found in plant cells that animal cells do NOT have?

Nucleus, Mitochondria, Cytoplasm Cell Wall, Chloroplasts, Permanent Vacuole Ribosomes, DNA, Cell Membrane Chromatin, Histones, Nucleolus

Question 3 of 11

How long is the stretched DNA inside just ONE single human cell?

2 millimetres 2 centimetres About 2 metres 1 kilometre

Question 4 of 11

How long would all the DNA in a Blue Whale be if stretched in a straight line?

Around 50 kilometres To the Moon and back About 10 to 20 Light-Years (reaches Alpha Centauri & back!) 100 metres

Question 5 of 11

Why do onion cells NOT have green chloroplasts?

Because they are animal cells Because onions grow underground in total darkness and don't see sunlight Because the iodine killed them Because chloroplasts are invisible

Question 6 of 11

In our microscope photo, what was the round object with the thick dark black ring?

A giant nucleus An alien bacteria An air bubble trapped under the coverslip A drop of pure iodine

Question 7 of 11

What is the "beads on a string" structure made of DNA and histone protein spools called?

Cell Sap Chromatin Cytoplasm Cellulose

Question 8 of 11

How does the nucleus know which recipe to send when you scrape your knee?

It has eyes to see the scrape Chemical sensor signals activate specific transcription factor keys that unlock that exact recipe It sends all 20,000 recipes at once The ribosomes tell the nucleus what to do

Question 9 of 11

What is the primary function of the nucleolus inside the nucleus?

To digest food waste It acts as the "ribosome factory", building the molecular protein-making machines To produce green chlorophyll To store water and keep the cell turgid

Question 10 of 11

What raw building blocks are needed in the cytoplasm outside the nucleus to assemble proteins?

Simple table salt crystals Amino acids (from digested food) delivered by tRNA trucks to ribosomes Cellulose wood fibers Pure chlorophyll drops

Question 11 of 11

Why does the ribosome read mRNA in groups of 3 letters (codons) instead of 2 letters?

Because 3 is a lucky number in science Because 4 letters in pairs of 2 only give 16 combinations (not enough for 20 amino acids), but triplets give 64 combinations! Because ribosomes only have 3 moving parts Because cells only live for 3 days